Odd leak out the carb?

3 replies to this topic
  • CRF150Joe

Posted February 17, 2007 - 05:35 PM


I have been rebuilding a YZ400F for myself and I put the gas tank on today and hooked it up to the carb and turned the fuel on and out of the black drain hose from the carb bowl gas leaks out with a pretty steady flow, I cleaned the entire bowl out and cleaned the floats and the pump cover sprained a ton of carb cleaner in the carb and still nothing. Does anyone have any ideas?..my friend told me to just put the bike together and run it and see if it fixes itself, he is assuming there is sometime of clog. Anyone have any ideas at all?

  • grayracer513

Posted February 18, 2007 - 12:14 AM


The float needle and/or the needle seat is either dried up and shrunk out of shape, or has a piece of dirt stuck on it, or caught between them. It may clear up on its own, but I would bet against it.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 642MX

Posted February 18, 2007 - 10:17 AM


The float valve is probably shot. The rubber gets a ring around the tip of the float valve and then gas leaks by causing your carb to over-flow. I'd replace the float valve and seat.

  • CRF150Joe

Posted February 19, 2007 - 07:55 AM


I sprayed a shit load of carb cleaner down the gas intake hole and it doesnt leak anymore

Related Content


James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.