Jump to content
Sign in to follow this  

Yz426f carb help please!

Recommended Posts

I just bought a 2000 yz426f that needed a little work. Well after fixing everything that needed attention...the carb now leaks out of the bowl. Not out of the drain lines, but out of the actual bowl, it leaks pretty good too. I can only get the bike to start for a split second, and then it dies. Could this be a jetting issue? I feel like the carb is flooding very quickly. Also, when I pulled the carb out two of the three jets were all the way down, and one was 4.5 turns out. I am at 8,000ft above sea level...anyone know what proper jetting is for this elevation? Thanks in advance for the help, and I can't wait to get this baby up and running.

Share this post


Link to post
Share on other sites

I also noticed the overflow line is busted off. I am just going to try to use some liquid aluminum or epoxy to reconnect that. You can also see where the gas is leaking from in this picture. ImageUploadedByThumper Talk1368404493.396324.jpg

Share this post


Link to post
Share on other sites

There are no adjustable jets inside the carb. The all should be seated (not to hard)

Your bowl cover has a continious gasket that goes around every screw hole. Inspect it.

If you get gas out of the over flow, your float needle is sticking. Take it out, inspect it. If you see any grooves in the rubber tip, replace it. If the seat it sits against has any pock marks, pull the carb.

Polish the float needle body and the cavity it sits in to remove the corrosion that is making it stick.

Share this post


Link to post
Share on other sites

Buy a new bowl, or find a used carb that has an unbroken bowl. There are two types, a three screw and a four screw.

You have bigger issues than even being close to worrying about jetting.

Share this post


Link to post
Share on other sites

Where could I buy just a new bowl, and not a whole carb? I bought this bike for $500 so I would like to keep everything inexpensive if possible.

Share this post


Link to post
Share on other sites

Find a used carb on eBay I just put a 08 carb on my 426 and they fit fine only thing is I had to get a new clutch perch to house the hot start. I'll check but I might be able to send you my old one I know the screw to drain the bowl is in bad shape.

Share this post


Link to post
Share on other sites

Ya Sid I'd be down to buy your old bowl off you of it's decent shape. Well, as long as everything is in tact, it's in better shape than mine haha. I don't really want to buy a whole new carb because that would cost almost 50% of what I paid for the bike and I'm trying to keep this one cheap.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By BDTRENT
      Selling an FMF Power Core 4 exhaust system off my 450FX. Exhaust has 80 hours and is 100% functional. This will also fit the 14-15 YZ450F and 16-18 Wr450F. If needed I can also include new muffler packing although it does not need it. 
    • By Woody Oakson
      I have a 2008 YZ450F with a stock header pipe and Pro Circuit T-4 Slip-On Exhaust. I'm 99% sure the slip on is shot because its loud as hell and when I take it off and shake it it rattles. I would repack it but the screws are all stripped ect.
      Anyways I've gone over the carb multiple times and I've got it running pretty well. The only issue I have with the bike is that it sputters and pops around 1/2 throttle when I hold it there. When I give it full throttle from any RPM it runs great or when I give it about 3/4 throttle it spins up like a top to redline.
      Initially the popping and sputtering was way worse I made the situation better by moving the pilot jet up in a few sizes from a 45 (stock) to a 62. The issue has gotten way better since then but I'm not super sure what to do from here. Should I keep moving my pilot jet up in size because that's a pretty large jump right? I tried changing my needle clip position but that didn't help much if anything it just made starting it worse and little to no impact on the ride.
      Any input on this would be helpful. I don't want to buy other slip on. Also as for the rest of the carb I'm very sure everything else in it is what it needs to be at. I've replaced all the gaskets and O-rings cleaned all the jets, valve holes ect. fixed the accelerator pump timing. I just thinks its strange that my pilot jet size is going so far from the stock 45, but all symptoms point to the bike running lean.
    • By Haydenbaha
      Hi I was wondering if y’all have been using a 450 on your YZ250F?
    • By RockerYZWR
      Excel Takasago 17x3 front and 17x5 rear supermoto wheels with Metzler M3 tires in very lightly used condition. Less than 200 miles total on the setup. Warp 9 spokes. Rear has a Talon hub with 45T Sunstar steel sprocket and OEM rear disc, and front has a polished OEM Yamaha WR450F hub (for the stock speedometer), with a Motomaster 320mm disc. Included is a DID gold o-ring chain, 14T front sprocket, and front brake caliper adapter for a truly turn key setup. Everything is in excellent condition, not a single scratch on these wheels. Came off my '11 WR450F, but will fit many different Yamahas with 20mm front and 22mm rear axles. Asking $1400 plus shipping.
      **Will be driving up near Atlanta, then to northern Louisiana, OKC, and down through Dallas and Houston, TX soon -- can meet or deliver if in the area (Aug 31-Sep 9)**
    • By YZ426fNC
      Hi I’m new on the forum and I was wondering if a 2001 Yamaha YZ426f clutch is interchangeable with a 2002 Yamaha YZ426f clutch thanks , Coleman
×