The SECRET to a FLAWLESS Carburetor!! | FCR Carburetor Rebuild Part 1

Come grab a coffee, get comfortable, and enjoy!
This will be a 3 part series, all of which are packed full great information about the FCR Carburetor.
Thanks so much for watching!!

[@rothvisuals]

I'm only 7 mins in and I already learned 3 new things and I've watched probably 10 carb videos before. Great content!

[@nwmotogarage]

Awww get out of here! Thank you! I had hoped this series would shed some new light on carbs. Sure I could spend the same amount of time showing how to clean a carb and tune a carb but like you said, there are already hundreds of videos on that. I wanted to cover the “other” stuff

[@greggfuller2220]

One of the better videos I've ever seen regarding the fcr overhaul. This guy has a straightforward approach. He's very knowledgeable. I wish more KZbin content can be as good as his.

[@nwmotogarage]

Wow you are insanely nice my friend, thank you!!

[@greggfuller2220]

@@nwmotogarage well of course. You deserve the credit. Thank you for passing along your excellent experience!

[@sailingaeolus]

I second this! Fantastic video and I would NEVER have guessed that mid-body part. Thnx for posting.

[@AxisDSTC]

I just learned so much and I cant thank you enough. By far the best and most detailed carb video on youtube. I wish you the very best🫡

[@willwyatt9385]

Thanks for such a detailed 3 part on this! Gave me the confidence to tear mine apart

[@mikewracher9511]

Now I know that I likely have mid-body carb issue, that alone made this worth it! Thanks a bunch!

[@lexdfox]

wow, puppy pads are such a good idea! wish I knew that before I changed the shade of my garage floor...

[@nwmotogarage]

Thank you! I happened upon it by accident! We had some extra and I was intrigued by the absorption so I poured like 3 full glasses of water on it and then it hit me…. Hey we have all been there brother!

[@probegt75]

Coming from a pwk 28mm to this I felt kinda overwhelmed but your videos helped me more than u know..thank you!!

[@nwmotogarage]

That’s awesome! Let me know if I can clear anything up!

[@kgmxtraining250]

Great idea with the puppy pad!

[@cat542233]

Everything i need man, thank you sooooo much . Best guiding video!!!!

[@Kimsand520]

Thank you for making a video about this, the only one i have seen is from @Clayton Motos. i have been struggling with my 08 YZ 250f for some time now with a bad bog of idle, replaced ALL the seals/gaskets/orings/accelerator pump in the whole carb except the mid body since almost no one talked about that, everyone just yelled that it was the accelerator pump which already was replaced. After having the carb apart for the 5th time in a year(what a pain it is to remove on this bike), it finally runs correctly after replacing the mid body kit!

[@nwmotogarage]

That is such great news! Really glad you could get it figured out! I would say the part about checking to make sure the Excelerator pump is functioning by squirting fuel on the bench like I demonstrated is really important to. It’s pretty common for those to get dumped up as well but if this fixed it then that’s awesome!

[@msaul85]

Good stuff, need MORE! You got me itching to take apart my 2005 FCR now, I doubt it’s ever been done

[@nwmotogarage]

If you do, stay tuned till the next two videos, lots of good stuff in there

[@acvn-hg9gy]

I allways use a little bit oa vaseline on my carb orings since it dissolves in gas anyway, but it helps the orings seat. Alse helps revives older lrings that leak when they get old cause it makes them swell the same way gas makes them swell. Good to be able to do in a hurry

[@ploffan2194]

Less goo another video. Keep it up!😁

[@nwmotogarage]

You’re the best!!

[@user-vb7xc2yx9k]

Love the long form videos.

[@zydecbro]

I've been dirt biking for years and just found out 2 months ago about Keihin mid body gasket problem, I used to do rebuilds and even JD hot jet kits and the carb still not be 100% correct since finding out about the mid body gasket it's been a 100% game changer on all 3 of my KTMs

[@nwmotogarage]

It kinda slapped me in the face when I found out about them… it’s like a whole new world is opened up to you! Thanks for the comment

[@kingfishstacy]

Well there's my problem! Having lean issues at idle Thank you brother!

[@leonwhite7225]

Best carb video I've ever seen

[@nwmotogarage]

Thanks so much!

[@matthewnorris203]

JIS screwdrivers! Vessel makes some great options, and they’re on Amazon, too.

[@SgtProstar]

Rad vids man... I am truly ng to diagnose a hesitation @ 1/8 th throttle on my old Yamaha that has the same carb....

[@nwmotogarage]

Have you tried the o-ring mod on the accelerator pump?

[@nwmotogarage]

I guess I should ask what yamaha?

[@michaelchantelois2034]

Great carburetor rebuild video! Couple of questions. What did you use to clean the carburetor? Like what kind of solvent? I'm concerned about putting the carb in a solvent with the tps attatched.What did you do with the choke plunger is there an o-ring in it?

[@Dimitri718]

🔥 I really enjoy watching your videos, don’t stop

[@nwmotogarage]

I certainly won’t! How have you been liking the shorts?

[@quinten4403]

I have a atv Kymco 700mxu. What i think is the carburator, doesn't look like that. It has the gas handle valve that opens en close but it looks like everything is electronic because there is no flote valve etc ...

[@zion525i]

Hi, great video! What complete rebuild kit did you buy from All Balls for the carb (mine 2006 RMZ450)? Searching but can’t find the exact part codes. Cheers

[@danielsymons1481]

What is the baseline setting for the throttle slide gap height?

[@waltermessina5462]

You missed to remove the floating needle's brass seat , underneath that there is a metal mesh usually dirty.😉

[@UnknownBluetoothDevice-sg1oj]

How do you take them out without damaging them? They don’t sell a replacement needle seat.

[@Ben-vd6xg]

I have a ktm sxf 250 2007 and it have a fcr 39 carburator it works fine the bike starts very well cold or hot but when I acellerate and drop it it keeps acellerating, not full accelerating but the idle rpms are too high I have to accelerate again for it to drop to normal idle rpms!! My question is if it have some parts inside that are spent And don't fit well!! Or some gigler that needs to be replaced!!

[@NOTTApro142]

I don’t use a FCR but my father has one in his 05 CRF450X. Like the video! Once that carbs done the bike will run clean!🧼

[@nwmotogarage]

I can hardly wait!! I will be using the same jetting that was in it originally so if it needs corrected, I will be sure to document it

[@caseymoto]

How many parts need to come off before the carb can be removed? I remember my 2 stroke was not much, but my kx250f seems like it will take more disassembly

[@garyhenion9459]

You have an tricks on getting the o ring and washer out of the fuel screw hole Thinking of using a dry wall screw and filing down the end so it does hit the port

[@nwmotogarage]

I use a straight pick that I have modified to have just the smallest hook

[@milwaukeeaterfu2190]

yep, mid body gaskets get old, will squish and shut the air fuel screw circuit closed

[@flindo5830]

Hi. I have a 07 KX450f and idles fine but when I goose it, it has a hard time returning to idle intermittently. Not all the time. What's the common internal part that sticks on these carbs? Thanks.

[@SomethingGood56]

Is there a full set of gaskets and reabuild kit for fcr 33 in one pack?

[@neiljohnolegario5694]

what happens if i dont put that slide plate in the carb piston ?

[@edh4686]

I know this is an old video but I have a question you might be able to answer. I have the same carburetor and in my bowl I have a chrome plate / liner in the bottom of that where I don't see one on yours. It's making it kind of difficult to clean the bottom bowl is that removable? I'm guessing it is saying that yours doesn't have one I'm just trying to make sure if I'm doing something wrong. Thanks great videos by the way

[@Fastlaneprojects_vlogs8622]

Where did you get the rebuilt kit from?

[@649childers]

Do u have a part number for all these gaskets

[@kaleb6206]

Keep these videos a rokin

[@nwmotogarage]

Will do!! Thanks for the support!

[@austintaillon350]

At 1:34 in the video u talk about ktm using a different variant and I was wondering which exact one it is

[@gmonkey9424]

Do you have a parts number for the all balls kit?

[@gabrielalejandrojerezguerr75]

can you send me a link where i can buy the rebuild kit please?

[@jaronmortensen]

I bought a quad with an fcr which isnt factory for it. I know nothing about these. Your video has helped me a ton! Is there only one version of the Keihin FCR? Mine looks slightly different than yours. And where do i find that all balls mid rebuild kit at?

[@nwmotogarage]

Hey! So, I’m curious as to what carb you have, can you email it to me? [e-mail] The rebuild kit is from RockyMountainATVMC. You might also try Motorsports.com

[@jaronmortensen]

@@nwmotogarage just sent you an email!

[@nicnadu0515]

Now I see why 4 strokes are always running better than 2 strokes 😂

[@user-vp9tt6rb5i]

What bike does this carb go to

[@chickencoupeking1010]

does anyone know the spec for the “nipple that shoots gas into the engine”???

[@michaelcotgrave8487]

l have a ZY 450 F with similar carb but l cant change the needle valve seat as it pressed in can l some how change the seat , l see different FCR mid body have removeable needle valve seat , not sure if l can change the mid body so l can change the seat , l do not see listing for the seat on my model and havent seen mid body listing with valve seat to purchase , thanks for any tips

[@nwmotogarage]

I believe I answered this on the other video comments! Thanks !

[@johnlekkas5350]

Can i have a link with the gasket kit?

[@F150Motocrosser]

Bro!! this video should serve as the New Testament bible for the Thumper generation. When I bought my first 4T after only knowing 2T life (KTM 250F) - I was crosseyed rebuilding it to remove the turrible green scale left behind by #ETHANOLSUCKS gas. You hit on THE two points that I swear by for carbs: compressed air and JIS screw drivers. Mind was blown when I discovered JIS. "whoaa, so THATS why float bowl screws always got F'ed!" . Real talk? As much as I like to think I know - had zero knowledge of the mid body stuff. This is golden knowledge bombs. Really looking forward to Part 2! Can you address the "free accelerator pump mod" ??? Something to do with wire tie is all I recall. Please don't stop grinding on these vids! The universe and the algorithm will sway in your favor ;)

[@nwmotogarage]

Holly smokes my guy!! Thank you so much for all the kind words!! The video itself is already filmed and edited and I didn’t mention the wire tie. But now that you mention it I will have to demonstrate it on my YFZ that I have in a future video!! And yes, I reeeeealy need those algorithms on my side

[@marineldaniel1537]

Ît s diference fcr 39 and fcr 39 mx ?

[@jaimechaves3260]

Where or what is the numbering of the repair kits?

[@practicallytactical3075]

Hey man had a question and you seem like the guy who may know. I have a Keihin FCR39 for a 98 Yamaha WR400. It was missing the accelerator pump rod. This is the “L” shaped rod. This thing is hard to find. All the eBay/Amazon sellers are all getting it from the same supplier (China) and are out of stock, till who knows when. I see that the old Keihin CV used on some Harleys has a “L” shaped accelerator rod and I have been able to find someone selling those. Do you know if the CV rod would work on the FCR-39? Thanks for the help and great videos.

[@nwmotogarage]

Thanks for the email! Hope you have good luck with the Harley, please let me know so that way I can keep that in mind for the future!

[@csedan510]

Why didn’t I see this first! Mine still won’t idle after ultrasonic cleaning and rebuild and I didn’t separate the mid body . So stupid.

[@markpavletich747]

Unfortunately the road version of the FCR had a very different mid body gasket ring set up. I don’t know where any are available. If anybody does know please leave a comment.

[@DZ4295DBW]

Why not just do a full disassemble and then toss the parts into a sonic cleaner?

[@keithphillips1234]

Man, wow. What a complex carb. I just picked up a 2009 wr250f Yamaha, it has a high idle in my opinion. Someone has put in a jd jetting carb kit which seems real popular, but I’m may wind up tearing it down bc of the things you showed near the end of your video. Bet money that part hasn’t been touched.

[@nwmotogarage]

The jd jet kit is nice because you get a different tapered needle and a few jets to “play” with. If you have a high idle, that most likely means you have too lean of a pilot jet, however there are a number of potential causes of a high idle

[@keithphillips1234]

@@nwmotogarage yea went through the jets in the JD kit and looks like they used a 178 which the manual says to, located here in Arkansas so that should be about right. I just picked it up last Saturday, test drove it and bought it. Got home, tore down to frame to clean and now putting it back together. May have to see if the idle screw that sticks out the side could be the culprit too tho.

[@nwmotogarage]

@@keithphillips1234 that 178 is the main jet, you need to adjust the long and skinny jet, the pilot jet

[@Factory928AC]

Can’t you add the link to the puppy pads!?

[@seatime674]

Wow the carb God,, need quick opinion please, Yamaha, Kehien carb, '05 WR450F runs great but pops alot on decel. 170 Main 48 Pilot air screw is 3 turns out, should I up the pilot to 50 maybe 52?. Thaaank u..

[@nwmotogarage]

With it being a 48 already, I would look at doing these mid body gaskets. It’s running lean so it’s possible the valves are tight and need to be Clearanced

[@nwmotogarage]

Might as well do them both, since you will need to takeoff the sub frame to get to the carburetor in the fuel tank to get to the valves

[@seatime674]

@@nwmotogarage Nope,, I have the '05 carb swivels and or pops right out with enough room to kick a soccer ball through it🤣

[@nwmotogarage]

@@seatime674 🤣🤣🤣 that’s awesome, yeah they don’t build em like that anymore hahaha

[@seatime674]

@@nwmotogarage Yeah roughly starting in '07 all makes started the flat sloping aluminum frames that chopped off easy access to carb and top of engine..😭 I'm a bit confused though, people say popping on decel is a lean condition and to go up on pilot jet size when popping is actually unburned fuel from being rich which should require a lower number pilot, Also to turn air screw "out" which is richer so what am I missing here. 🤔

[@michaelcotgrave8487]

where does one get these gasket oring sets as shown

[@nwmotogarage]

I purchased mine from either RockyMountainATVMC or Motorsports.com but they are both from a company called All Balls Racing and you can get it from them directly online as well

[@traxxasrc10]

See I still have the hanging throttle and no idle. And when I can idle I hit the throttle and still has a hanging idle after changing the mid body seals. I’m so lost with this carb now and my 250f

[@nullwii]

all balls did not include a safety torx with my rebuild kit damn

[@roryhamilton9426]

How many hours you think it would take from Start to finish?

[@nwmotogarage]

I can do it in under 3 but that’s because i have done several mid bodies and 100’s of carbs, so probably 4 hours once you get your bike on the stand

[@nwmotogarage]

And that’s no to say it’s hard for you to get the bike on the stand, just like as a starting point

[@stuartdows1090]

What brand is the kit?

[@nwmotogarage]

This one is from All Balls Racing 👍

[@DLPCHG]

Name song?

[@Jaciuwu]

Damn i screwed up doing mine, at least i know what i did wrong but sad i cant go back in time😂

[@nwmotogarage]

Oh no! What happened to yours?

[@Jaciuwu]

@@nwmotogarage it runs only on choke now, but! Its leaking because i broke the gaskets, then i saw the weld on my alternator cover just broke off i dissassembled it and broke the gasket on thiss too😆 so from fast thing changed into lots of parts buying. Soooo i have no idea how will it run

[@Jaciuwu]

@@nwmotogarage also by screwing up mine i meant dissassembling the throttle position sensor (thx for awesome video too, at least i know what i broke :b)

[@robert5712]

Good video but... at crucial times showing jets your rush through. Please slow down at these critical descriptions and even show a pic of the jet. Example at 12:00. I am learning a lot just need you to slow and be specific at certain points. Thank you

[@peteh8077]

The secret is to replace everything you can within the carb lol.

[@o0XFernX0o]

Anyone ever remove the accelerator pump without pulling the carb?

[@johnwatson3400]

If you loosen the band clamps and swivel the carb, I think you can get to it

[@o0XFernX0o]

@@johnwatson3400 I did it without loosening anything. It was a pain but definitely easier then than removing the whole carb again

[@EWDrums]

Can I just pay you to rebuild mine? :-)

[@martinmartinez2877]

Me, too!!

[@fstanl3636]

I think I fucked up... I changed the throttle sensor but I havent had any issues so maybe I got lucky???

[@mervynmclean2283]

Hi what sort of issue did the TPS fix as I thinking need one stuttering an pulses at low stead revs .

[@fstanl3636]

@@mervynmclean2283 It did the same with me and I would have weird power bands within the throttle. Ive had to do my valves tho and currently the bike doesnt run so there is another underlying issue.

[@davidparker1477]

The vent hose with black plastic t piece . What can I do if plastic snapped

[@nwmotogarage]

Fortunately it’s not a critical pice that effects the way the bike runs. None of these hoses are vacuum lines so you can either run two separate hoses or leave it off. Thanks for the comment!