Rebuilding a 4 Stroke Carburetor

Build Your Own Heated Parts Washer goo.gl/pmuSfK
This Honda CRF450 carburetor needed a few replacement parts and a detail cleaning. It's pretty amazing how many parts there are to a 4 stroke carb compared to it's simple 2 stroke counterpart.
-Cameron
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[@CameronNiemela]

Two stroke or four stroke? What do you ride?

[@Mennow208]

Cameron Niemela Two Stroke

[@mrvolts9262]

I have a klx300r ('99) and a 95 rmx 250, best of both worlds!

[@henrihaaramo2767]

husqvarna cr 125 2t

[@jonathanbrandt3137]

Two stroke! Forever two stroke

[@krockerboysoutdoors7258]

I ride a 2009 ttr 125 and I am building a 1996 cr 125

[@dank479]

You reinstalled the accelerator pump diaphragm in the wrong direction. Great video

[@Jordan.Ballard]

I noticed this as well. Thanks for the comment - Flipped mine before putting it back in the bike - Cameron, this video is priceless~ Thanks

[@juliusmorgan2292]

OOF

[@simonlopez3554]

I’ve been looking for a video like this for weeks! Disassembling a carb for the first time, so the detail helps.

[@brycetokarski6661]

Thank u so much you just saved me from spending a lot of money I love u so much I had idle hang on my wr250f I tried everything to fix it and It was the throttle body slide plate it was upside down😂 thank u again😁👌

[@grollehar5918]

Finnaly a good youtuber WHO show you How to rebuild dirtbike stuff btw Im working on a aprillia 125cc 2 stroke so thanks for giving some tips How to rebuild btw you are the best (sorry for bad english in from Finland so)

[@pzimmermanphoto]

You saved me many additional headaches by mentioning the slide and plate. Just made the same mistake. Instead of breaking the whole carb down again I flipped the plate and my problem was solved!

[@4tomclark]

I gotta take mine out and flip that plate. Seems weird that it goes in that way

[@ibxtiger6920]

your brain worth 10 billion dollars for me.Anyone agree?

[@USMC-Sniper-0137]

It's not the genius part of the equation. It's the ability to follow instructions!! AND you are only as good as the tool collection you possess! It's the lack of tools that will make a job seem and look so difficult.

[@TWist-sh4uc]

We use the ultrasonic cleaner for cleaning the precleaned carburator housing and the jets. The small holes get free after that treatment and blowing out. The carburator works like new and is easy to adjust. Perhaps you try. Thank you for the nice vids.

[@apexnight872]

Cameron your vids just get better and better every time it’s very much appreciated how much details you put in to your vids and very interesting

[@CMP_Offroad]

I recently just purchased a 2002 Yamaha Wr426F it started once and I haven’t been able to start it I’ve never owned a dirt bike or motorcycle before or have any experience with bikes so this was kinda scary for me but I was able to rebuild it and have it running in less than an hour your video was very informative thank you so much !

[@jaysonsterling3530]

5 minutes in and I’m already learning sooo much! Thank you!!

[@CameronNiemela]

Thanks for watching man!

[@randycantu1]

This video came in handy tonight. My boys and I are rebuilding the carbs on our 06 and 07 Yamaha yz450f dirtbikes. These are the same carbs we have. Thank you again...we subscribe and enjoy your videos!

[@Folsy36]

This is my job for today, thought I check YT first for a refresher and struck gold. Cheers Cam

[@DB-yb6jr]

Wish you had put this video out a couple years ago, I spent a couple days trying to figure out why I put on the plate on the slide upside down. Thanks for the great content.

[@pzmiami]

Thanks. My bike had this hidden problem and now after watching this video I was able to fix it. 🤙

[@Marvelfunfaqs]

Omg, super awesome video! Such valuable content, it's crazy! With this, i now have to confidence to rip apart my crf Carbs... This video will break 1 million views one day. Thanks a million Cameron!!!

[@HB-it8ng]

ISLAND RIDERS - DIRT BIKE GARAGE legit ive allways been worried to do it now im not too!

[@BigSlushi4k]

I’m gonna be taking on this project soon!! Just bought my first dirt bike

[@warcog]

Hey Cameron! I'm back again, to learn some more from you, and another one of your fantastic videos. THANK YOU! This time, we're just preparing to do our final assembly on a new CRF250X Supermoto for my son this weekend! Our bike is fully disassembled right now and we're just about finished cleaning the frame; using your wash/scrub method and the Eagle mag wheel cleaner you turned us on to! We'll be taking our bike's carb apart, rebuilding it, and installing a jet kit-so this video is going to be a BIG HELP in that process. As always, your videos are fun, clear, smart, well-produced and easy to follow. Even us old motorcycle dogs can learn new tricks from you! Well done, again. Take care, Bro.

[@Cetrifuga1945]

Sei sempre il n1

[@mikekellendonk9983]

Awesome vid, took mine apart forgot where one screw went but figured it out as soon as I watched this. Cheers and thanks

[@dirtbikechannel700]

you do such amzing cleaning job, wish i had all those resources to keep my bike looking brand new!

[@adilsonhubner8990]

Cameron seu video me salvou ,estava com uma crf-250 r com problemas de lenta e estava invertida a peça do pistonete do acelerador.

[@jasonheizer9457]

Dude you saved me a lot of trouble. Had my slide upside down and couldn’t figure it out. Thanks and keep up the good videos!

[@kevinanderson8118]

Thanks for the tip in the slide, an easy mistake to make!

[@LuisLopez-wt1yv]

It really helped me, thank you so much i have the same problem with the plates upper side down and all the tricks congratulations from venezuela

[@alfredvillegas2176]

Helped a lot saved me money thanks man great explaining

[@mkushin]

Seriously, your videos have become priceless to me. I'm amazed that this content is something I can get for free to help me work on my CRF450X. Thank you!

[@ryans2118]

Thanks for the input/hard work/dedication. Figured out where i screwed up by thinking while watching ur vid.

[@tomatoknuckles]

Brilliant as always cam. Would be nice to see you do another one of these explaning the mid body gasket on the fcr it's always overlooked and is a major cause of issues on these carbs 👍

[@moneymike4017]

Why didnt you remove and clean the float needle assembly there is a plastic filter under there that has to be clean to

[@peterrettinger8426]

Your tutorial vids are the best on net . Keep up the good work

[@anthonyquantuman730]

Brilliantly clear pics of reassembly.. However, you need to edit with some text during the accelerator pump diaphragm install "Its installed the wrong way, the nipple should be uppermost"

[@USMC-Sniper-0137]

When installing them cute transparent color matching rubber 1/4" vent hoses that appear to be too small to fit over your NIPPLES, just heat up a coffee cup with at least 1/4 full of water in it for about 1 minute and a half in the microwave to a near boil ( that is tuff rubber). Next while next to your carb and hoses, drop one end of the hose into the water and let sit for at least 60 seconds. Once you pull it out, swing the end quickly to fling the water out of the hose( if you use an air compressor to blow it out, the hose probably cooled too much). Now the hose should be soft enough to easily fit over your carb vent nipples!! Everything was so nice and tight and I didn't have clamps so I didn't use any. Take your time and have patience. If you don't have a microwave or a stove, use your campfire tins LOL...Then neon green ones on my KX250F look awesome!!..... Enjoy.

[@RufleezMX]

It would be perfect if you had also made a video of how the hoses of that carburetor are connected to which places they are directed.

[@USMC-Sniper-0137]

I've packed up my carb and it's on it's way to you for a bath and rebuild buddy!! Much appreciated!! LOL

[@laberdude]

its very importand to check the freaking O-Ring between the upper and lower Carb. removing the torx-screws and u will get it. old carbs often suffering from the bad gas nowadays and getting into the tiny holes

[@jmg6484]

Amazing video, meticulous way of rebuilt, great explainations, wonderfull details on video, and always filmed with joy and happiness, it's so fine, Thanks Cameron !

[@robertwoods2505]

Do you remember what bike that is off? I noticed it has a screw and washer to retain the float valve seat like mine from an '03 CRF450R. I thought the CRF FCRs had a pressed on seat. Great job Cam!

[@ryanmoore6795]

I've noticed in some of your previous videos that you use an electric pressure washer, cleaning up frames for example, is there a certain brand you would recommend over others for your typical rider that isn't in the market for a gas-powered washer? Great content as well! Awesome to see another Washington State rider/mechanic!!

[@CameronNiemela]

Thanks! I use a Ryobi 1800 PSI one from Home Depot

[@gabewilliams5993]

Hey, before your big 100,000- 200,000 subscriber break, please don’t change and become useless and too caught up in fame like Braydon Price or 3D Machines, don’t get me wrong, I love both, but they’re too mainstream and you’re more down to earth and relatable, good luck, thanks for quality content!

[@Marvelfunfaqs]

Gabe's Crazy Adventures - hahahahaha

[@Marvelfunfaqs]

Yeah Cam, don't sell out man.... or we will hunt you down and....... jk😅

[@mxcollin95]

Love your videos! Please never stop making ‘em. 🤙

[@robertwoods2505]

I know this is a few years old now but it was still a good watch. Great job. BTW, for FCR's the R&D Flex Jet air screw is a very good mod for $30.

[@johnrichardson8048]

Pretty sure the orifice that my pilot fuel goes into is blocked, screwing it in and out makes no difference to my idle speed, I was hoping to see you take apart that bottom section above the float bowl, with torx screws in it.

[@pinkpuffin187]

Did you ever fix this issue? I think you are referring to the mid body. There is not a lot of info around on replacing the mid body gaskets. I have a hanging idle and I think the mid body is the issue.

[@Fixin2Ride-Official-]

I just noticed that you put the AP Diaphragm back in wrong.... 1:59 is when you took it out and 10:57 is when you reinstalled it... I'm sure you figured that out later though. This video helped me tear down my first FCR in 2020.

[@michaellane6841]

Thank you for making this video!

[@Vagabond_NZ]

i fucking love u man had my plate backwards was that way when i pulled it down so assumed put it back the same way oh man cant wait to try this now and try get my wr250f running right i love u dude no homo xoxoxo subbed for life

[@208flatbedOO]

I noticed when you took it apart and pulled the fuel screw out i noticed the oring and washer was in the wrong order. 🤓

[@4tomclark]

I saw that too. However when he put it back together, he did it correctly.

[@jordanbrower9402]

I ride a Crf450x it’s got a ton of power! Aye I really enjoy your videos man keep up the good work!

[@pmfilmsUK]

Absolutely brilliant

[@user-sp8eb6iz7f]

looks like the air mixture screw had it spring, o'ring, washer. Should be spring, washer, o'ring. You removed everything but the 'nozzle'.

[@rovincowboy]

Very nice job! I am currently doing this on my 2009 KTM 450 XCF and this is most helpful. Thanks! Cecil D. New Mexico

[@DYLLY0456]

On the thumbnail he looked like Michael Sabo was about to destroy the fake mikuni carbs for his banshee😂

[@christophervillarreal8565]

your patience level is amazing I'd be cursing to every god of every religion then praying to all of them for help finishing before losing my sanity..... lol

[@Altcoin.gangster]

I really like the informational video I am a tech and have been thinking about making a channel myself recording all the bikes I work on...your fuel screw assembly was in wrong though I'm not sure if it was someone else or you that out it in there last but the washer and o-ring go in the reverse order it goes screw washer o-ring in that order on every single car wether it be an air screw or fuel screw it doesn't change

[@danieladamski6628]

great video, but you forget about the float valve. threre is a filter and a washer. i nad problem with IT so that i know now xd

[@AREA51_ATVSXS_PERFOMANCE]

amazing video thank you so much for the high quality and precession

[@ottovp]

at 1:51you have washer, oring (badly squashed) and spring at 11:32 you have oring, washer and spring => correct cheers

[@francobazzi2576]

Best video ever!! Keep on Cameron!!!

[@adamm5015]

The info on the slide was great. Did you replace the 3 main gaskets and 2 o-rings or did you reuse them. Thanks.

[@Mental-Mess]

Hopefully I get some advice. I rebuild the whole carb and cleaned it for my yz450f. Before it would leak from the carb over flow tube (the one at the bottom of the float bowl) constantly when I had the gas turned on. And still does this even after a full rebuild. Any advice? Thank you

[@opichocal]

Mine did the same thing. Did you figure out the problem?

[@nicolasnicolas3362]

Thanks Cameron..your video it.s so helpful, great job and good things from Romania 🤗

[@RBFR01]

I usually blow compressed air threw the jets and then blow air from my mouth threw them to make sure they aren't blocked.

[@genaminin]

Would be nice to know what each parts do:)

[@succafool9]

Thanks so much man. This was so well done and so helpful.

[@Chalz108]

I just went through the carb on my 1981 yamaha xt200 today and God damn is it simple compared to the 450r carb

[@ottovp]

great video but why you didn't check the fuel pump gap? and an oring mod would be awesome too!

[@israeltoledo5755]

Really loved the video. Am in process of rebuilding a flat cr carburetor on a yamaha yfz 450 raptor. Thanks.

[@gilesyful]

Well done. This is my job and I still found your vid. Interesting Cheers

[@nighthawkj30A4]

I use 3M silicone paster on all o rings and gaskets.

[@donovanlucibello379]

Where to begin . . . thanks for saving my bacon, bro - very clear video. Any trouble with the throttle position sensor at the end? Thanks!

[@stefan4510]

Amazing video, thank you. Now I will try to do the same with your video as reference. :)

[@4xrocksyells198]

You got some balls using an impact

[@xrmanny729]

Thanks for your help Cameron

[@xrmanny729]

I just rebuilt my daughters 2007 crf150r

[@danjim7056]

This looks like a mid body carb no? The mid body gaskets are fairly common to be bad

[@USMC-Sniper-0137]

I don't think my eyes were deceiving me when I saw you remove that fuel mixture screw and the metal flat washer was outside of the little rubber o-ring 1:51 . Videos always shows to install the spring, the metal washer and then the o-ring. Did I see that correctly?

[@andrewpardo301]

How about the mid body gaskets? Those tend to go bad with ethanol.

[@johnmignano7872]

Awesome result Cameron...would you know if CRF450 carburettor can be used as upgrade for XR600R?

[@gra55hop]

Awesome photography as usual Cameron and really easy to follow. Best carby vid I've seen. Hope all is going well with you. I've been riding Yamaha 4/s of late but really turned on by the power that these new 2/s are putting out. HAVE TO GET ONE I THINK! Whats your go to 2 / bike? Dave from NZ 😀

[@michaelbranch7416]

4:15 I made the same mistake. Bike had low compression. Bike ran like shit. I stumbled on this video. When and turn it around. Bike ran great again. 02 crf450r.

[@soMuchToxic]

❤❤❤❤Dude you are amazing keep up the good work!!! Really love your vids you show passion and you are never negative really good job❤❤❤❤❤❤❤

[@toskurim9495]

Why did you put the rubber band of the accelerating pump upside down?

[@martinsluters3651]

Thanks Cameron, helpful video!

[@MrCalifornia1234]

I ride a crf450r and now use stabil which seems to keep my carb clear after I had to pull it apart because of bad gas.

[@dantsy6397]

I have gas pouring out of those 2 little holes from the intake side. Any ideas? You can see it pretty good at 9:12 Great vid btw

[@kslats916]

Is it just me or did the airscrew have the incorrect stack up when it was pulled out? I think the correct stack up on the screw is spring,flat washer and then o-ring. This one came out spring o-ring and then flat washer.

[@elcajoia619]

Actually of all people that watch this, the KTM guys should give you the most "thank you's".

[@richardtschida2321]

When the fuel screw is initially removed is it me or is the washer and oring is out of sequence? It looks like it's metal washer, o ring then spring. Thanks Cameron.

[@humbertomachado3798]

Olá essa arruela de nilon qli do eixo, da guilhotina, fica encostada na parede do carburador ou para a parte de dentro?

[@ianmurray4919]

Great video! How much torque are you supposed to apply to the choke when installing? Thank you ahead of time

[@anthonynicholich9654]

You installed accelerator pump diaphragm backwards

[@robertwoods2505]

I should have asked what year the CRF450r was?

[@tylerdonnelly2901]

Always have to like the vid even before i watch it because i know its already gonna be lit an i ride a 06 yz 125 :D

[@timwarner5645]

Took mine apart and rebuilt it but Mine is now hard starting. Do you think I may have the slide backwards.

[@pierresuiveng1332]

Why don't you disassemble the part between the bottom float and the two manifolds ? I've done it and the joint in there was in a really bad shape.

[@thomassylvestro9041]

Another excellent video. All of your stuff is so detailed and explained. I really feel like I could do it with your help and this video. Thank you Is there any special instruction for the idol screw,or just screw it in until it stops. Also any experience with the 32mm CRF150RB cabs. I have a 2020 that is so hard to get right.

[@brianhannigan585]

Awesome video. Exactly what I needed! Thank you very much. I will Subscribe for sure.

[@Dj-ve2hx]

Your fuel screw washer and O ring were backwards when you removed it.

[@snapfly7]

What kind of grease should be used for the pulley bearings?

[@peopl3champ]

Awesome job sir

[@MrAddison79]

Is there an o ring for the hot start and or choke?