Join Date: May 2009
Location: Indiana/ Michigan line at the Lake
OBJ is right.
Both problems exist. I choose to have a full flow (constantly on) petcock, and
manually turn on and off the gas.
Your float needle valve is either sticking open or there's a bit of crud, even as small
as a grain of sand preventing the needle from seating. It's a very delicate assembly.
The carb can be blown out with compressed air to unseat whatever is stopping the
closure if the float and assembly are ok. Try that first. It's free.
If your bike has been otherwise fine all along, probably a bit of grit got past the
fuel screen and embedded in the cone part of the float valve.
A replacement diaphragm for the petcock is a cheap fix too but requires fully draining
the tank before taking the thing off.
You'll have to do some work, but it shouldn't cost much $$.
Even a new float and needle valve assembly should be around 20 bucks.
As always,get the service manual. They usually pay for themselves
on the first use in saved labor charges. Plus, you'll get to know