Carb leaking into Cylinder when bike sits ?????

BigLou, makes perfect sence when you put it that way. Sometimes I don't think things through. I do have a problem with my xt's petcock not turning all the way off. Havent any reason to believe the 426's doesn't completely turn off. Even so, your point about the needle valve is most obvious.....duh!

Thanks for setting me straight. That's what I love about this site!

Dennis

Big_Lou is right here

The Petcock may not be shutoff or shuttoff fully, also he is right on the carb if there is leaking form there or the float is stuck. The carb should over flow unless that hole is plugged then there is no place to go but were gravity sends it. Down the throat of the beast. I would do the following jus as a test.

1: Pull the fuel line off the carb and stick a catch bucket under it. (Dont Do this In a closed Garage Fumes Eh Ignite) Do this on the side of the hous out in the drive or back yard if you can.

Check this out to validate if there is any leakage / sepidge from the fuel tank, making it a petcock problem. Even if the petcock is at fault the Float should shut it off, this indicates that something in the crab is wrong aka float level, dirt in the float valve assemble so on.

You probably already have this but if you do not it is wise to place a filter inline on your fuel supply....

Best of luck

You know, that stupid fuel breather check-valve DOES trap alot of air in there...I think it's a stupid thing to have. It's VERY possible that it is pushing fuel out through the carb....

Those gas tanks just balloon up....I wouldn't doubt that at the very least....it doesn't help any.

Mabey this is the fuel pump though!!! :)

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