Fuel leaking down side of carb on 98 yz400f

So I tried looking in the search and found nothing. I washed my 98 yz400f 2 days ago and a day later I noticed that fuel was building up around the outside of the bowl and dripping, not a ton but enough to notice it's like it's coming from above the bowl though. I have no idea what I'm looking for this is my first bike. It's on the left side of the carb as if you are sitting on it I think unless it's running around the carb and building up on the one side. Also my idle nob will not turn. Please help. Thanks

I dunno what the problem is but I've seen this on a couple of ones myself when I was looking a yz400f,what country are you in?

It's likely that it could be that the float is stuck which is allowing it to fill up to the point where it overflows.

I am from America. The weird thing is it starts with no problems.

Nothing weird about the bike starting with a fuel leak.  On the right front corner of the float bowl is a roundish chamber wherein lives the accelerator pump diaphragm.  These will tear and leak gas up around the shaft that rises vertically from the pump housing.  This would be where I looked first.

The idle knob is attached to a tube which is attached to the idle screw on the other side of the carb.  Might just try spraying some kine of penitrating oil on the idle screw.  The knob on mine is bent a little which makes it hard to turn.  You might look at that too.

Create an account or sign in to comment

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

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now