help with leaky fuel petcock

hello fellow xjers.

a few months ago i noticed that the reserve was leaking. at that point i just decided to fill up or switch to on when parking. Now the ON is leaking as well....so i decided to buy a rebuild kit:

http://www.powersportsuperstore.com/K-L-Supply-Fuel-Petcock-Repair-Kit-18-2699-p/4092277.htm

I installed it after some cleaning, only to find the valve leak. It is pretty much a full flow in reserve and not as bad when on ON.

I did some more research, cleaned the seat some more, stretched the spring some, and added a washer to the spring...exact same thing.

What gives? Why is the reserve so much worse? If it was a seat/o-ring issue, shouldn't the reserve/ON leak the same?

 

Does it flow normally in prime position?

Did you follow this outstanding how to provided by Bigfitz52 to make sure you have it cleaned and properly assembled, and that it was worthy of a rebuild?

http://www.xjbikes.com/forums/index...ng-the-yamaha-vacuum-fuel-valve-w-pics.25058/

 

Yes, prime and res are both a full flow. on is a slower leak. Yes I looked at that and mine seems to be in decent shape. Maybe tonight I'll snap a pic of the seat.