|Topic Review (Newest First)|
|07-29-2017 09:32 AM|
|mrseedsower||The Yamaha petcock is a TW200 and I got it new from the Yamaha dealer for less than $40|
|07-29-2017 09:24 AM|
I went round and round with a leak with my petcock. I had actually two leaks. One on the outside and one on the inside that caused it to leak into the cylinder.
I solved mine by putting a non vacuum petcock on the bike. I believe it was a Yamaha petcock and I haven't had anymore problems since.
So if you want to get past a headache fast that other petcock is the way to go.
|07-24-2017 01:24 PM|
|twowheel82||There is no gas in the crankcase for sure. The diaphram does not look as if it is worn or that is was ever in the groove . It does not affect the way it runs or performs.|
|07-24-2017 01:20 PM|
I do recall a notch or groove on one side when I rebuilt mine last year.
More than likely the diaphragm is leaking vacuum, it may also be leaking fuel through the vacuum line, which can fill the crankcase with gas.
|07-24-2017 12:47 PM|
Petcock vacuum leak
My wife has a 94 750 Great bike. There is a vacuum operated petcock with a leak that I can put my finger on it. It is at the bottom back corner. I took it apart and there is a groove machined into the back cover where the vacuum leak comes from. No one I talk too knows if is supposed to be there or if I need to get a rebuild kit. Anyone out there know Please and thanks for your help