Fixing the FCR Carburetor

[@Natedoc808]

Great video. I’m going through an 09 YZ450F for a buddy of mine and his carb was in even worse shape. Thanks for pointing out the mid body gasket as I’d never pulled one apart and sure enough this one was clapped out. With todays fuel, now with up to 20% ethanol without them needing to relabel it, I got a tip from a former factory mechanic- put just a little bit of 2 stroke oil (250:1) in all of your fuel. It lubricates but also stabilizes the fuel much better than Stabil or Star. Since I started doing that going on 10 years now, I haven’t had a single carburetor foul up like what you showed here; plus a little valve lube and hint of the smell of the good ol days is nice.

[@kylefletcher9667]

I cant begin to explain how much this frickin HELPED!!!! THANK YOU THANK YOU THANK YOU! Couldn't find a single thing until this GEM!

[@highlandcycles]

Awesome, stoked to help.

[@matthiasschulze393]

yep did that mid-body gasket replacement 2 years ago for my 05 450X..bike has run perfectly ever since...i bet there are 100's of bikes out there that just need that mid-body done to run like new again

[@highlandcycles]

Totally

[@alexjohnson3696]

Just wanted to thank you for taking the time to make this video. Helped me out hugely. Liked and subscribed. Ride safe - from Bundaberg Qld Australia

[@highlandcycles]

That is awesome to hear

[@sebastianignaciomoraramire892]

I’ll try to fix my FCR carburator with your support of this video, greetings from Chile 🇨🇱💪🏽

[@STIZEN9]

Ive never been so excited to watch a video but highlandcycles is doin it to me! Im trying to figure out what i got myself into buying this 08yz450f! I got it running, now its not running. HOWEVER, Im already knowing this brother and this video is going to help me with this. YEAH

[@highlandcycles]

STIZEN9 awesome

[@dougcaron8908]

Thanks for the video bud !! My middle body gaskets were Jelly on both my Thumpers 01 Yz426 n 04 Ttx450r with FCR mod....Both bikes now RIP and idle Perfectly! Huge improvement from where they were at before especially the 426 I dropped in Hot Cams stage 2 both intake n exhaust w decomp, Valve adjustment, clean carb and New Mid body amd rebuild kit Jetted for Utah elevation.....So Happy with her now Fires up by 2nd kick and is almost twice as Fast as before !!!! Thanks again HIGHLAND CYCLES!! YOUR THE MAN!!!!

[@highlandcycles]

Awesome!!

[@craigmac1516]

Awesome was struggling with a idle issue . this nailed it great content thanks Morgan...thumbs way up👍👍👍

[@highlandcycles]

Glad it helped!

[@scott2214]

Did you leave the electrical connector on whilst it was in the ultrasonic cleaner?

[@highlandcycles]

Yes

[@f18a]

I dunno why you got thumbs down. Maybe your cinematography? Anyway, great tip on the importance of the "mid-body gasket."

[@highlandcycles]

Bob Walters thanks. Yeah I don’t know why either. Some people are just negative

[@bobmcgrath1272]

Best video on the FCR carb rebuild for the real world. I left that shitty fuel in my CRF for a while and it gunged up the carb pretty good. (Worse than the one you show) anyways I knew I’d have to replace the mid body gasket and it was nearly impossible to find (I’m in the UK) but I persevered and like you show it was totally goosed. Also cleaned it all in an ultrasonic bath which is critical. Hopefully have the whole thing back together in the next few days. Awesome vid with a good level of background wisdom and knowledge that you share. Just subscribed. 💪💪

[@highlandcycles]

Thanks so much

[@bobmcgrath1272]

And she’s running! Sweet as a nut

[@highlandcycles]

@@bobmcgrath1272 sweet!!

[@markbuhr5369]

2001 KTM 520 - Why is there no check ball in the accelerator pump assy? Also there is a square brass piece pressed in a hole the pump should pull or pump fuel thru (I dont remember fuel direction) fuel can flow around the brass as it is a square in a round hole. Why is the brass in there? I am tempted to drill out the brass OR figure where a check ball belongs and add it. ---- I cleaned carb myself and I paid to have carb rebuilt with All Balls kit - it still aint right ---- I wonder about pump because riding, burping throttle, sometimes it responds and sometimes it does not. Idle is erratic, I turned idle up to about 1100+ rpm just to ride without stalling. All starting hot/cold/ choke/no choke sucks - no pattern but it always get it started. Valve clearance is correct, top end is good, spark plug is clean running, hauls ass on the gas. ---- I need consistent throttle for technical trails and idle and consistent starting. Any ideas? Check valve ball? -- Hey thanks for any ideas. I am about to tear into it soon myself.

[@highlandcycles]

First of all, do the mid body gaskets, that will help. As far as the brass square, I have no idea. I’ve seen that on a few bikes and I don’t know why they did that. I would leave it alone for now. Just replace that mid body gasket and clean well.

[@outtherefaraway]

Great video, thank you! Just purchased a KTM 520 that has been sitting in a garage for 16 years. This video is exactly what I needed!

[@highlandcycles]

Awesome!!

[@CJGuitar]

How do you get the float needle seat out for replacement. My is damaged from ethanol. 10:18

[@highlandcycles]

You can't remove the seat unfortunately

[@mikesanders902]

@ 14:45 screw spring washer! U Rock

[@Jockmystilo]

You put the main part of the carburetor with the throttle position sensor and wire still attached? That’s not going to mess anything up?

[@highlandcycles]

Nope. Since there is no power to it it is just fine.

[@thomashenderson3901]

@Highland Cycles - I've got this carb on a 250 exc-f four stroke KTM. I'm having a lot of trouble with the transition between idle and main jet where the engine is fluffy and unresponsive at that slight crack of the throttle, then it suddenly goes. I'm coastal, factory settings, #3 needle and 1.25 screw position. It's on a 168 main, I forget the others. On the third rebuild! Nothing wrong with the carb that I can find. Could it just be the idle mixture adjustment?

[@highlandcycles]

Go up on the pilot jet

[@thomashenderson3901]

@@highlandcycles Noted! Thank you.

[@scottwilson4105]

Great video, I just ordered a mid body gasket, and you have a lot of nice random tips for how things should be. I rebuilt my carb and everything looks perfect except the slide doesn't come all the way down so when I look through the intake port it's obviously up 3 or 4 mm's. The throttle shaft also doesn't rotate all the way back as it's a few mm's away from the idle screw. Any idea? Figured it out, the accelerator pump actuator was rotated counterclockwise about 90 degrees, the stop on it was on the wrong side of the throttle shaft. This probably happened when I attached the slide wrong and it snapped past it. Kind of a MF to get that all back together right with the spring tension!

[@justgjt]

Just a heads up on your ultrasonic cleaner. You dont want to lay anything directly on the bottom of the tank because it can damage the transducer that does the vibrating. You want to use a basket with small rubber feet or hang / suspend the object from above.

[@highlandcycles]

Thanks

[@spencerreif9879]

I have a fcr from a 2003 drz400, the mid body is epoxied on with something resembling jb weld. Any tips for removing this epoxy to rebuild the midbody??

[@highlandcycles]

Crap. No, maybe just heat and a good whack with a rubber mallet

[@Fullthrottlefriday]

I just called you about that carb thank you for the advice brother wish I lived closer I'd have you do it the clowns around Pennsylvania don't know anything

[@highlandcycles]

Haha. Glad to help

[@Jakestarr1723]

Jordan where at in PA you live? Come to my shop

[@josh20109]

How do you go about removing the epoxy from the midbody to replace the gasket?

[@highlandcycles]

Lots of patience and a little pick

[@josh20109]

@Highland Cycles Thanks, dude & do you have any recommendations on what to use to re seal the carb? I need to do my mid body gasket, and im dreading it

[@highlandcycles]

@@josh20109 I don't use anything other than the gasket

[@josh20109]

@Highland Cycles got you thank you! Going to try a few other things first then attempt the mid body gasket if needs be; Read that alot of people have had issues getting this mid body gasket aligned properly / to seat properly and have bricked their carbs trying to do so, so a little hesitant to do this job lol

[@highlandcycles]

@@josh20109 hahaha. It’s not that bad. I use a little grease to hold the mid body in place as I slide it together

[@DisruptiveUnicorn98k]

I have always wanted to split the carb like that but now that you mentioned that those gaskets wasn't available, now I am happy I never did split it but it makes sense why I couldn't ever find the issue with why my bike ran horrible, I always took it to a carb guy or Yamaha and they couldn't fix it and now it makes sense why my bike was running horrible, now I regret selling my bike man I'm bummed out now

[@highlandcycles]

Yeah. It was so dumb. You couldn’t get them forever.

[@DisruptiveUnicorn98k]

I really love working on these older bikes , I feel more comfortable with them , but I probably could be done better if I knew about the mid body issue, I'd probably have opened them up just to regret doing it since I am from South Africa and where parts is limited and shops with people who has skills and knowledge experience or even honest enough would probably just ruined my bike as they have done with two of my bikes where I either had to do it myself or buy an entire new Engine which was unnecessary, but just can't trust them , because I've seen the horrible work they do , unless you buy everything brand new then it's not an issue, but they can't replace and fix worn parts , they would rather have you buy everything new ... But anyway love your content if it wasn't for you I probably would have missed those fine little details that I could not figure out , well I probably would've if I had the funds and honest help from people like you , but I really enjoy your videos,thank you for helping others

[@kdawgy22]

I’m trying to find some now. Can’t seem to find a rebuild kit

[@DisruptiveUnicorn98k]

@@kdawgy22 I founded in UK some fcr kits , but I don't know if they would work in the country you are in because each country has their own little weird different part on the bikes

[@johnnycat60]

I wish someone would show how to set the seal between the two part that have the little wheels on it. Does the seal go in the groove around the ring or does it sit on top?

[@highlandcycles]

Goes in the groove

[@johnanderson7988]

So thanks buddy...I have this same carb off my 530excr. Anyway she's in my ultrasonic cleaner with FABULOSO, LOL. Doing the mid body also. All Balls had both kits. Only thing I missed is that slide round rubber piece. Can't figure which way it goes back on...Hope it runs!

[@johnanderson7988]

So what's up at this point is the carbs all stripped down and when I opened the carb kit the slide seal had a piece missing from the edge. All Balls is sending me a new kit gratis which is cool and I did find how that sucker goes on the plate. Plenty of good pictures out there!

[@markwilson6425]

Mid Body screws are they torx, allen, tamper proof screws,,what size driver as dont want to strip them out Thanks

[@highlandcycles]

Depends on the carb. Most are t10 torx I believe

[@markwilson6425]

@@highlandcycles Thanks

[@bryce099]

Other than the nipple pointing towards the accelerator pump cover, is there any other orientation I need to put the accelerator pump diaphragm??

[@highlandcycles]

It needs to go in the way it came out. There is an up and down

[@phillippieretti5559]

Great video man thank you!

[@highlandcycles]

Thanks

[@EliminatorPerformance]

Great video brother, just rebuilt one for a friend and his kit didn't come with the mid body gasket. It looked ok, but doing some research I came across this vid and after reading your replies to some comments, I recommended he purchase it so I can replace the mid body gasket while everything is out! He's installing a bigger pilot and main (ones that came with his exhaust I think), anyways, you adjusted the clip on the needle and I'm just wondering if it's necessary. The new replacement needle that came with his kit only has 1 slot so I didn't use it, because the factory one has some adjustability. Just wondering what your thoughts are about altering the needle before actually testing the carb out 1st. Thanks!

[@highlandcycles]

Adjusting the needle is important for throttle response. We are at 6000 ft and up here so I run them either in #2 or #1. For lower elevations I run #3 or #4

[@EliminatorPerformance]

@@highlandcycles thanks for the quick response! Cheers from Ontario Canada!

[@andrewlewis6975]

I loved this video. My son has a 2007 KX250F and it is hard to start, terrible idle, and backfires on decompression - was running great a few months ago, but now to the point of frustrating him (and me). So I plan getting the complete rebuild kit along with the mid body gasket kit and see what difference that will make. As you also did, I will start with screw out 2 turns. I don't have an untrasonic cleaner so it will be a bit more involved in getting it nice and clean. I will also check the accelerator pump for holes or wear. If I am successful with the KX250F, I may do a repeat of this on my other son's 2007 SX250F KTM that also sports a Keihen FCR carb - it's only challenge is it is hard to start - but no idea how long it has gone without a good strip and clean. Keep up the great work !

[@tyhodder1423]

Andrew Lewis hey mate any luck with carb? Is the of 250f Easier to start now?

[@davidlloyd6963]

I have this problem were it works great with any level of choke on but when the choke is off it has a hard time just getting rolling without stalling. I have to rev it then it's at least able to run. Just ordered a bunch of parts to rebuild this carb. I thought I'd never get to fixing this but since the carona virus came to NY I got a lot of time to fix all my toys!

[@highlandcycles]

I bet if you clean it well and replace the mid body gasket you’ll be good to go. And replace all the other stuff too of course

[@perezmosh]

@@highlandcycles Do you have links for the rebuild kit? And the middle kit?

[@highlandcycles]

@@perezmosh I don’t.

[@keithphillips1234]

2009 wr250f idle is erratic, slow to return back to smooth idle. Works for a while then it don’t. So doing a full carb rebuild on mine as well, main kit, mid section and accelerator pump kit too. Appears to be same carb. Should I be able to follow this video for good result as far as jetting or no. Here in Arkansas hot and humid in summers. Anyhow tried explaining to groups in Facebook this is why my shifting is problematic at times, bc, the idle won’t return to smooth and consistent at a stand still or during a ride which won’t allow the momentum of the engine and internals to slow down to allow for a smooth consistent shift. They disagree. But it only makes sense to me. But I could be wrong. Maybe you can shed some light on it for me. I’m ready to enjoy the bike and stop working on it trying to get this carb issue lined out. Any help or advice would be great. Thank you man. You do awesome work.

[@highlandcycles]

If the clutch isn't disengaging fully the idle can effect the shifting but if you have the clutch adjusted correctly it shouldn't

[@paekeajiab4743]

I have a suzuki rmz 450 2007. It was sitting about 1 year.. it did not start.. cleaned the carb twice.. it started but it is running well only with choke on.. when the choke is off the bike popping and backfiring... Also a little smoke comes out from the carb... What is going on????

[@highlandcycles]

Not sure

[@whitey2579]

my Accelerator pump squirter is angled wrong. hits the side of the carb not down in the head. can i change the angle. 06 trx 450

[@highlandcycles]

Yes. Got to take the carb apart at the mid body

[@ericraherimanjato9688]

Good info thanks for sharing

[@highlandcycles]

Thanks

[@bradk6047]

Was that a MX carb or a slant body

[@subros.]

17:19 I feel bad for you son. I got 99 problems but my carb ain't one 😂

[@K3nfloww]

Thanks for this video. About to do this myself. Have done the carb and bike still barely runs.

[@highlandcycles]

Good luck

[@Ben-vd6xg]

Nice video.I have a 2007 Ktm SX-f 250 and when i run it, it starts fine in cold start and hot start, and when i push throtle it responds well but sometimes it take a few seconds to drop the throtle and keeps acelerated a few seconds sometimes i even have to give a litle throtle kick for it to drop the aceleration to the normal idle rpm.My question is what do you think it could be, my mechanic already disasembled the carb but doesnt find any problem but it keeps doing this.

[@highlandcycles]

I would guess a minor adjustment needed in pilot circuit or a small air leak.

[@Ben-vd6xg]

@@highlandcycles thanks I will try to check that!!

[@aimbot8912]

What jet controls idle i can only get my yfz450 to run on the choke and dies if i dont use the choke

[@highlandcycles]

Pilot

[@smellyuki1068]

Can I please have the link for the parts, my 06 beta 250rr could really use a carb rebuild

[@highlandcycles]

Check here bit.ly/3qiJO3h

[@DeadEnduro]

How do you re set the tps if you have removed it?

[@highlandcycles]

There is a voltage value but I just get it in the same spot

[@morecore6915]

I purchased the allballs kit also. I am almost finished with my rebuild and I have a leftover small (7.6mm / 0.3" dia) seal that I can not find on the FCR-MX exploded view diagram, any suggestions? It is not an o-ring or u-ring, has a tapered outer edge and cupped surface on one side. My father-in-law use to say if you have leftover parts that you have to eat them, so at least it is small.

[@highlandcycles]

Hahahahaha. I have seen that in a few kits recently and I don’t think it goes to anything in the kit. I recently rebuilt a YZ250 carb and the kit had the o ring and washer for a 4T fuel screw. I don’t think that they are paying much attention to packaging 😂🤣. But yeah, it’s small lmao

[@RufleezMX]

Where can i buy all products?.

[@highlandcycles]

bit.ly/RMATVMC

[@OscarJimenez33oskr]

Hello, my carburetor does not suck enough gas, the tank wrench and the hoses are fine and without garbage inside, any idea what could be the problem? My carburetor is the same as the video Greetings from Costa Rica!

[@highlandcycles]

Oscar Jimenez have you replaced the mid body gasket?

[@OscarJimenez33oskr]

@@highlandcyclesNot yet, there's no in my country where to buy so I'm looking to bring it from USA

[@markbryan7981]

I have a Gas gas 250F with the same carb, but I have no where to plug in that wire coming off the carb... What is the purpose of that wire coming off the carb🙃

[@highlandcycles]

Throttle position sensor

[@mikesanders902]

You are the man

[@dhall5634]

You ever seen a tiny piece of plastic inside the mid-body? Just took apart a 41mm fcr and a little piece of what looks like 1/16th inch long weedeater string fell out of the mid-body. The parts fiche for the fcr's don't seem to show the mid-body area at all

[@highlandcycles]

I haven’t seen that. That’s crazy

[@scottsober4131]

Does the kit come with the orings for the fuel swivel?

[@highlandcycles]

Unfortunately it doesn’t

[@danielreynoso8981]

Great video. Do you mix the FABULOSO with water? Or just pour straight from fabuloso bottle? Thanks

[@highlandcycles]

Mix with water. About 2 cups fabuloso in 10L water. Maybe 3

[@lwhamble]

Great information, but what do you do if you don't have access to an ultrasonic cleaner?

[@highlandcycles]

Lance Hamblen good question. In that case I use brake cleaner and High pressure air to blow through all the passages.

[@markalan4026]

Nice video, thanks! Hey, what ultrasonic cleaner do you have? I browsed around a bit, there's so many choices, not sure which one to go for. Also, how can I tell if my vacuum slide plate needs replacing? There is some play in it. Do you happen to know what the wear tolerance specs are for it? It's an FCR39MX.

[@highlandcycles]

I use one from Amazon. 10L

[@markalan4026]

@@highlandcycles Appreciate it, thanks man. I found it on there right away. It seems to work awesome, the carb came out looking great. How long do you leave it soaking for in there? I'm sure you're super busy. Sorry for all the questions.

[@highlandcycles]

@@markalan4026 I run it for 40 min at 60 degrees c

[@audleyboyd1]

Where did you find the rebuild kit?

[@audleyboyd1]

I found it from all balls

[@MrWotan109]

I have a 2008 kx 450 and recently done the shims and replaced chain and all is good on engine side. Reason for my comment is that when I want to start the bike basically from cold start I have to use the hot start and with choke out then bike will start? However as soon as I leave the hot start lever or push choke in the bike simply dies! Since I have seen this video of the mid section carb being stripped I will also do the same and check those gaskets/O-rings out. (Note: I replaced all jets and the gasket set I could get from Kawasaki but not the mid section)

[@highlandcycles]

Definitely check the mid body gasket. Most likely your issue

[@MrWotan109]

@@highlandcycles So yeah had a look at those gaskets and boy are they worn. I will try and get the All balls kit because Kawasaki does not sell the part loose here in South Africa. Great video helped me a lot!

[@highlandcycles]

@@MrWotan109 awesome

[@dannyreynoso8746]

Great video. Do you need to dilute the fabuloso with water or pure fabuloso in to the ultrasonic? Thx

[@highlandcycles]

Dilute with water. About 2/3 cups fabuloso in 10L water

[@Kx85Dude7]

So another guy was saying the mid body gasket wouldn’t come off because there was glue in those screws/Allen head screw. Well I’m in the same boat. Can’t seem to get them off because of it and I’m stripping the hell outta the screws. Any suggestions? Also, a little off topic, but with the idle screw cable adjuster I don’t have a a spring at the end of it. Is that needed or can I figure something out like take a spring from the end of a pen and work it on there?

[@highlandcycles]

Yeah they paint them to keep you from Messing with it. But you can dig that paint out or you can grab the screws from the outside with some pliers. I have special ones for it. Also, you need some kind of screw but anything stiff enough will work.

[@adamdean2291]

Good shit man only info i found on the mid gasket and how it can plug the holes. Im pretty sure it plugged my accelerator pump hole.

[@highlandcycles]

Yep.

[@adamdean2291]

@@highlandcycles Do you happen to know what the accelerator pump jet is called or where you can get it??

[@highlandcycles]

@@adamdean2291 I don't know what it is called for sure but I would call JD Jetting. They sell most things separate from the carb.

[@adamdean2291]

@@highlandcycles ok thank you I did get it unclogged but now when I give it throttle it bogs then idles really high then goes back to normal idle gonna play with the timing a bit but man carbs can be a pain.

[@LVFigGardenChannel]

2008 CRF 450r just went to do the mid body and it has 4 screws With white gunk inside and no hex or star to remove them. What should I do? Also what altitude are you at?

[@highlandcycles]

Ugh. Yeah, that’s paint that they put in those bolts to keep people from messing with them. You can dig it out. We are at 6k

[@JBAutomotive794]

What are the symptoms of a bad TPS? My CRF250R runs great at idle and low RPM but breaks up at high RPM like crazy

[@highlandcycles]

That is definitely a sympton of a TPS being bad. It is easy to test. Just unplug it and go ride. They run great with it unplugged if everything else is good.

[@JBAutomotive794]

@@highlandcycles thanks brother! Subscribed!

[@highlandcycles]

@@JBAutomotive794 awesome. Thanks.

[@gxvdxwtv386]

you say the adjustable fuel screw is an upgrade, what is used in that hole when its stock? do you need that screw?

[@highlandcycles]

There is a screw there stock but this one is aftermarket and sticks down so you can get to it without special tools. The stock one requires a special driver

[@gxvdxwtv386]

@@highlandcycles Thanks for the quick reply! Is there any risk to running the bike without one for a short while? Mine fell out and we couldnt recover it but hoping to take it for a small cruise before the new one comes in the mail.

[@highlandcycles]

Yeah, not a big risk to the motor but it for sure won’t run well.

[@STIZEN9]

@3:17 , exactly where you are pointing, there is a white plastic part, and in the middle there is a brass part. I NEED TO KNOW IF THIS PART IS REQUIRED ON A 08 YZ450 CARB, BECAUSE MINE DOESNT HAVE 0NE! AND YES I STILL HAVENT GOT HER RUNNNG YET. AND IVE SPENT ALOT ON PARTS MAN. AND ALOT OF TIME AS WELL WRENCHING AWAY WITH NO GOOD RESULTS

[@STIZEN9]

AND I MEANT, MINE DOESNT HAVE THE WHITE PLASTIC PART.. THANKYOU.

[@STIZEN9]

OK ITS CALLED THE BAFFLE- WILL ITS ABSENCE CAUSE HARD START ACCEL BOG ISSUES?

[@highlandcycles]

@@STIZEN9 The baffle won't cause it to be hard to start or to bog really. It is there for when you are moving and banging around to keep the fuel more stable near the jets. The only time you might notice it being gone would be in really rough terrain. It can cause the bike to run poorly then.

[@STIZEN9]

@@highlandcycles cool man I was assuming that in my imagination, but still was looking forward to your response. Peace be multiplied to you and your family! haha

[@bucktoyota]

Do you know what way the gasket faces or how it goes on the slide plate? Flat side up? Or down?

[@highlandcycles]

I think it’s flat side up if I remember correctly. I just try to put it on the way the other one comes off.

[@bucktoyota]

@@highlandcycles thank you. I had forgot to check the direction of the old one. And I was able to get it on both ways.

[@gennaro10100]

Salve dove posso acquistare il kit revisione per Kehin.ho un Fcr 40 da ricostruire grazie

[@Wander.Fleaux.Productions]

So my throttle valve slide is getting stuck at the top when I turn the throttle drum. I am not sure if it is supposed to do this and I am just turning it too much, or if something isn't assembled correctly. To reset it I have to push the accelerator push rod lever and it allows the slide to go back down. Any tips or thoughts?

[@highlandcycles]

Something is definitely wrong. You probably need to take it apart and figure that out.

[@scottwilson4105]

I had the exact same problem. You didn't attach the throttle shaft assembly to the lever that attaches to the slide properly. You have to rotate the throttle shaft assembly and move it in and out while getting the slide lever thing in properly and then get the holes to align so you can put the screw in and attach it. It's kind of tricky but once you do it, it will be obvious it's right. My problem now is trying to figure out why the slide is not going all the way down and resting on the idle screw, it's up several mm's.

[@matthewsmith5109]

@@scottwilson4105 its not supposed to go all the way down and seal. But you can check your idle screw and see if that helps bring it down

[@leestoutmusic]

I have an FCR slant and am going to replace the mid body gasket with an All Balls kit. There is some sort of sealant on the outside of the carb at the mid body join. When you do a rebuild do you apply a sealant when putting the carb back together or is the o-ring gasket enough? Thanks heaps for the video!

[@highlandcycles]

You don't need any sealant, I know what you're talking about and I'm not sure what that is from the factory. The new gasket will be all you need. Thanks for watching our stuff.

[@robcampbell9409]

How did you manage to separate them with that seal? Mine has it too and won't budge

[@clareman176]

@@robcampbell9409 hi Rob, did you manage to split it? My drz carb is stuck together, any advice to help seperate it would be great, thanks

[@robcampbell9409]

@@clareman176 Yeah a quiet nudge with a hammer and block of wood got the job done. It took less than I thought it would to come off. There was a lot of swearing going on before that. Don't bother trying to cut the sealant either. It's made of something harder than diamond! Good luck

[@leestoutmusic]

​@@robcampbell9409 You know I only just started that job today. One of the 2 inside screws almost stripped out when removing it. Next will be removing the filled in paint from the 2 outside ones. Thanks for the tip.

[@caseymoto]

My slide doesn’t go back down - do you think it’s the rubber gasket

[@highlandcycles]

CaseyMoto i could be. That or the plate

[@caseymoto]

highlandcycles the plate was on backwards it’s snapping back now!!

[@highlandcycles]

CaseyMoto right on!!

[@redeyezard3999]

Do you know if you can buy just the gasket on the slide? Or donyou have to buy the whole thing for $70

[@highlandcycles]

brandan utzerath I am not sure actually. A lot of OEM manufacturers don’t offer individual parts but some do.

[@whatsit2ya247]

Exellent video!! FINALLY someone's explaining and replacing mid body gaskets, my local KTM dealer was actually discouraging me from replacing those! Subscribed.

[@highlandcycles]

That’s ridiculous. Thanks for the sub

[@alicehall8870]

Other videos seen to point to the slider wearing as a problem with these carbs? I have a hanging idle issue and it seems to point to the slider wearing, it has a plate that is designed to wear but they are over 100 to replace. Any ideas on a cheaper fix?

[@highlandcycles]

Allan Paul I don’t have a cheaper way but I would check your mid body gasket. I have found that it causes way more problems than the slide. If you have already replaced that then it’s likely the slide. I would check with JD jetting about parts. They seem to offer lots of replacements for less than OEM.

[@alicehall8870]

@@highlandcycles hi just for info I put some gasket paper behind the wear plate to pack it out a bit and hey presto it worked. So pleased. Thanks for response, the mid gasket was going to be my next attempt at a fix.

[@highlandcycles]

Allan Paul great to hear.

[@eylonb]

Does the all balls kit (26-1266) comes with mid body gasket ? Im having all kind of strange problems with my fcr and where i can find instructions for the kit

[@highlandcycles]

It doesn’t

[@lylegoodluck]

What do you think about the dual spray accelerator pump nozzle? Will it cut out the bog at the bottom end?

[@lylegoodluck]

Dual Spray Venturi Jet

[@highlandcycles]

I haven’t ever really messed with one. I think it might. But honestly, if you tune the carb well it is really good.

[@danielreynoso8981]

Do you need to dilute the Fabuloso with water? Or straight from the bottle? Concentrated? Thanks. Great video

[@highlandcycles]

Dilute with water. About 2/3 cups fabuloso in 10L water

[@patrickcasey330]

Nice vid - I was working on my FCR tonight. Got a question . . . . . what is the hole in the intake bell next to the slow air jet?? Mine was filled with dirt . . . have been chasing some tuning issues . . .

[@highlandcycles]

I think you are talking about the air feed for the main

[@patrickcasey330]

@@highlandcycles Yep - it goes right into the jet needle area. It's just a hole - nothing in it . . .no hreads . . Wonder how much better the bike will run with that unclogged . .

[@highlandcycles]

@@patrickcasey330 it shouldn’t be clogged.

[@patrickcasey330]

@@highlandcycles Never seen clog like that in any carbs I ever owned! Thinking about it,, that hole has a direct passage to the main jet, so by my reckoning, the impact of it being clogged would diminish the venturi effect. This would probably contribute to diminished fuel flow . . . contributing to the bog that I noticed , , , , the other thing I found with this carb was that the AP nozzle pointed directly at the SIDE of the carb. Ordered an Athena dual squirt AP Nozz . . Also, you mentioned using grease on those midbody o-rings? Thanks

[@nicpouss8207]

I have a fcr on my 04 YFZ. I have a problem. I think it passes too much gasoline than it should. Could a bad mid gasket cause that? The idle stays very high and i have backfire. Sparkplug is very black and it smokes a little. I’m sure i have the good jets

[@highlandcycles]

It definitely could be the mid body gasket

[@nicpouss8207]

highlandcycles ok thanks. I will disassemble it tomorrow and check all the gasket. Thank you your video helps a lot

[@highlandcycles]

Nicpouss great to hear

[@myguitaryourface5160]

Do you know what the screw in the mid body does?

[@highlandcycles]

The flat blade?

[@myguitaryourface5160]

Yeah that's it

[@highlandcycles]

@@myguitaryourface5160 That is the Accelerator pump nozzle

[@myguitaryourface5160]

Do you have any idea how many turns it is supposed be set at?I tried to take it out but I just keeps turning and doesn't come out

[@highlandcycles]

@@myguitaryourface5160 it’s not like that. That is just so you can aim it. You want the spray to go to the middle of the carb

[@GUNDARZZ]

Hey highlandcycles. Great video on this topic. I have now rebuilt my FCR on my 2007 CRF450R. Got a question about jetting hopefully you can answer please. I live in Idaho at about elevation 5000 ft. My manual calls for stock settings 178 main 42 pilot 3rd clip position. Fuel screw 1 3/4 turns out. For my elevation and temperature it calls for 172 main 40 pilot 2nd clip position and fuel screw 1 1/2 out. So i set everything to 172 main. 2nd clip position. Left the 42 pilot in and im 1 1/2 out fuel screw. My bike fires up when cold so much easier with hot start. Harder to start with choke for some reason. Sometimes wont start at all unless using hot start. When it starts it runs perfect though, idles great and everything. Just wondering why i always have to use hot start? Kinda the same problem with a 2005 CRF250R that we have. Its all stock jetting. So like you did, should i up the pilot jets even though manuals call for smaller the higher elevation and hotter temperatures? I'd really appreciate your input on this. Thanks alot!

[@highlandcycles]

Sound like it’s right on. Might turn the fuel screw in 1/2

[@GUNDARZZ]

@@highlandcycles okay I just went and tried that and I'm noticing it starts up easier without the choke or using hotstart the further I go in on the fuel screw. Im at 1/2 turn out and it seems better. Does that mean i should maybe go 1 pilot leaner, to a 40? Manual says minimum and maximum range for fuel screw is 1 1/4 - 2 turns out. Or are manuals just a guideline and not set in stone lol? Thanks man i really appreciate the reply. This was the best video I've seen for FCR rebuild. Thank you!

[@highlandcycles]

@@GUNDARZZ I’d leave it alone. I like a little richer pilot.

[@Danman1972]

I have a 450 I messing with. The o-ring, spring, and washer are gone from the adjuster. I gave it a ultra sonic bath with pinesol .... it works as well and smells fresh. Just discolors the brass. What a pain in the arse! has to be the most complicated MC carb I've seen. Did you buy the gaskets separate? I didn't realize or check mine. It has a hanging idle. I figured its the adjustment screw issue, but if that doesn't work may try to find the gaskets. Thanks for vid....

[@highlandcycles]

Danny Compton you can buy the gasket separately. K&L makes one

[@Danman1972]

@@highlandcycles Thanks again.

[@chihuahuaverde425]

@Tyson Ballantyne I was really happy with the All Balls kit. The jets are an off brand, but the gaskets are great (and flat) and the slide plate gasket makes the kit worth the money itself.

[@perezmosh]

Great video! Do you have links for the rebuild kit and the middle body kit for 2003 ktm 450 exc? (Fcr 39) Thank you!

[@highlandcycles]

I don’t.

[@colinkensley]

Great video thank you

[@highlandcycles]

Thanks for watching

[@tacticalcqb]

Have a 2008 YZ450F that sat for over a year. I drained the fuel from tank and bowl and did a straight seafoam soak in the carb while on the bike. It starts up and finally will idle with the enricher pulled out. She runs rough but if I shake the bike back and forth the idle gets better. Should I just break down and clean and rebuild the carb?

[@highlandcycles]

Yeah. There are lots of passageways in there that need to be clean.

[@jons66f100]

What dilution do you use for the cleaner?

[@highlandcycles]

I put about 2 cups of fabuloso in 10 Liters of water

[@jons66f100]

highlandcycles Thank you for the reply! Could you post your link again to amazon for parts etc?

[@AnthonyDelVecchio-fo4xp]

What altitude are you at?

[@highlandcycles]

5700 ft

[@kevinanderson8118]

Did I get this right, a larger pilot jet makes it leaner since the main jet went smaller.

[@highlandcycles]

No. The pilot jet needs to be bigger at higher elevation because there is less vacuum and the pilot is so small that it’s hard to draw fuel. It’s a physics problem that is counter intuitive

[@jonolson5668]

What brand or style of carb would you buy for a 2006 YZ450F. For just average trail riding.

[@highlandcycles]

The stock one is the best. Kehin FCR. Not sure what size it is but I don't like swapping carbs on 4 strokes. I have done it and never been all that happy.

[@questtauro244]

I have a 2004 yz250f with the same carb and has always ran good my throttle got stuck so I cleaned the carb left the float alone put everything back together and still throttle won't snap back it's gotten smoother but won't snap back and carb is also pouring gas out of the Drain line soon as I turn the fuel on

[@STIZEN9]

Morgan I totally forgot what I really wanted to ask you. I took the carb off inspected it cleaned it, and had put it back on and the only way to get her to go was with the choke on. when off, that sucker was backfiring and wanting to backfire like crazy. Then I had the hardest times getting her to start. The backfiring- is it because of carb cleaning or maybe the timing is off by one tooth?

[@highlandcycles]

Sounds like you didn't get the pilot circuit all the way clean or you need to do the Mid Body gasket. Did you do that gasket?

[@LVFigGardenChannel]

What type of grease did you use? Brand?

[@highlandcycles]

Motorex

[@codyweien4513]

My trx450r has a choppy low idle even with the idle all the way up, have gone up and down with pilot and main an no change, could mid body o rings do it?

[@highlandcycles]

Yes.

[@codyweien4513]

@@highlandcycles that's a very informative answer 🤣

[@highlandcycles]

@@codyweien4513 Hahaha, well, it is the answer to your question. The mid body orings can cause those symptoms. If I ever have weird carb issues now, I just replace the mid body stuff no matter what.

[@codyweien4513]

@@highlandcycles yeah, I went through it yesterday an they will all totally smoked. Found this after jetting 4 times, new high comp wiseco, new ported head, new petcock, plug wire, etc lol.

[@Lyons17r]

I put a FCR off a YFZ on my Z400 and running really lean and high idle no matter what adjustment to the idle and air fuel and jets, I pulled the slide out and noticed there wasn’t a o ring on the slide, I ordered a kit to rebuild it and having a hard time finding a mid body, would solely no o ring gasket on the slide plate cause high idle and very lean condition at high idle?

[@highlandcycles]

It can for sure but if you’re going to bother, you might as well do the mid body too.

[@Lyons17r]

highlandcycles I pulled it off and went back to stock until I get time to do the mid body, it did help a lot just has a lot of hesitation. One more question, does it matter what jets? Like going with name brand vs a amazon jet kit?

[@slickricktheruler]

I used to use fabloso as well but I use pinesol now. Works much better. Peace

[@markwilson6425]

Quick question ~ Did you have a spring in acceleration pump, which way was it assembled cheers Mark

[@highlandcycles]

Yes it is in there. It goes in the same way it comes out. I don’t remember right now but if I have a question about that (like did someone else do this wrong before me?) then I check the parts fiche

[@jessegregory4428]

Nice vid!

[@quadvloggs6876]

Have had a buddy's bike over and the plug is going wet and only starts with starting fluid and revs high like chokes on and only stay running if I keep on throttle instantly dies when let go of throttle, almost was ready to pay a shop 90 bucks an hour to figure it out but I have a feeling this is it as it's a 2009 with no carb maintenance ever

[@highlandcycles]

I'd say rebuild it the right way and see how it goes.

[@quadvloggs6876]

@@highlandcycles yes thanks so much for this video

[@tbrosupermoto4106]

I know this is an old video but does it hurt your tps at all putting it in the solution?

[@highlandcycles]

No. I’ve never had an issue with it.

[@lgda92gsr]

Can u post part number for mid body gasket

[@highlandcycles]

Which bike?

[@Themandogable]

What elevation was ya at? Hey bike ran perfect, till one day it didn’t start so i did a full rebuild including mid body. And now it idles perfect, but sputters an chokes when i get on throttle at low rpm, fine at high rpm. Mix screw doesn’t do much, i can get rid of most the problem if i have the screw in all the way!??? If its out even quarter turn it sputter chokes. And just gets worse the further out i go with it. So im guessing I’m running to rich with idle mix screw, NOW THE BIG QUESTION, can the mid body gasket have slipped somewhere when i was putting it in and directly caused this????? Please someone help before i pull it apart agen…

[@highlandcycles]

The mid body gasket can move unfortunately.

[@Zalagar619]

Also make sure you checked the jetting, most carb rebuild kits come with the wrong size jets, so make sure to look at the size you had in in and the sizes in the kit. Most times you'll find the jets in the kit are alot smaller than what you had in it even from factory.

[@madmechanix4962]

Question for ya swami!! 04 crf250x this accelerator pump injector nozzle little brass piece on my carb isn’t stationary.. had a hell of a issue recently where it turned and was squirting into the air box vs the intake.. is there a way to remedy this or do I have to split the mid body?

[@highlandcycles]

Gotta split the mid body unfortunately

[@napper1496]

Unless you have an mx steer clear of the early fcr slants

[@tylerdalley4401]

I am running the fcr on my 01 yz426, what jetting would you recommend at 5500ft?

[@highlandcycles]

I would start with a 48 pilot and a 168 main. Put the needle in #2 and try that. It should be close

[@leemorley5610]

I have a fcr carb and the fuel screw doesn’t do anything until it’s literally falling out any idea how to rectify this thanks

[@highlandcycles]

Probably need to get a new oring, washer and spring for it

[@leemorley5610]

@@highlandcycles I’ve already rebuilt it with new gaskets new jets but same as what got took out as well with new spring oring and washer thanks

[@highlandcycles]

Sorry, I misread this. You need to go up on your pilot jet

[@leemorley5610]

@@highlandcycles it had a 42 pilot in it from standard and I’ve worked my way up to 52 pilot and hasn’t made any difference thanks

[@highlandcycles]

@@leemorley5610 have you replaced the mid body gasket

[@bradsmith3346]

I noticed you did not remove the idle screw or the tps before putting it in the ultrasonic cleaner. Is this ok to do? It won't damage anything?

[@highlandcycles]

Yes it’s ok. Doesn’t hurt anything as long as you take it out and dry it off when you are done.