Replaced stock petcock with Raptor on my rebuild and bike is now running fine...although: there is a noticeable odor of gas with the engine off, whether petcock is in ON or OFF position. There are no leaks, at least of the liquid variety and a sniff test on both sides of the carb doesn't reveal the culprit. It does seem to be coming from the gas cap...could this be a simple gasket issue? Bike only had a 8K miles when I bought it.

Remove cap.
Lightly oil the ridge on the tank.
Lay a piece of glass on it.

Is it touching everywhere?

If not, plug it off with paper towels, rags, whatever. Put sandpaper on a flat piece of whatever, and work that surface flat.

I hadda do that. Mine leaked after a fillup.
Does yours?
You might be able to win by taking the cap apart and putting a shim in, pressing the rubber tighter. But, that's not exactly easy.
It takes a thin shim.

verslagen1 wrote on 05/09/16 at 13:25:41:


Bingo...  one of the signs of summer... (warmer days = more gas expansion)...

First...yep, vac port is plugged.

2nd...will check the seal and sand if necessary.

3rd...it is warm and it just might be vapor leaking from the keyway.

Thanks all!!

When you installed the Raptor...did you reuse the washers on the bolts?  Those washers have rubber seals on them to keep the fuel from leaking out around the bolts.

while were on the subject be aware that drinking milk is good for your bike,if you finish a gallon save the plastic jug,cut yourself a nice washer the size of the rubber gasket on your gas cap ,place it between the rubber and the cap ,perfect thin shim.Nice to fully gas up and not see it running down the tank heading for your privates.