1998 Yamaha 650 V star petcock valve

SOURCE: Fuel petcock positions on my Yamaha XJ 600 Diversion S

hi jamie,, as your sat on the bike ,, push the tap down ,the fuel is on,, pull the tap up thats reserve,,turn the 3 quarters round thatl be prime if u have it,, if u do that is purely 4 morning starts,,
u must put tap to on when the bike starts,,if u look carefully mate on the edge of the tank,, there is a arrow head stamped in 2 it,,

SOURCE: valve clerance for yamaha xj 650,what is the clerance of exhuse and intake?

xj650(uk) and xj650j
inlet 0.16 - 0.20mm
exhaust 0.16 - 0.20

all other models
inlet 0.11 - 0.15mm
exhaust 0.16 - 0.20mm
set when cold

SOURCE: lost my manual

0.003 - 0.005 in. intake
0.005 - 0.007 in. exhaust

yamaha v-star 650....

SOURCE: 1985 Yamaha xj700 Maxim- Carb. fuel lines

yes, the breather line hooks to the petcock on the line facing the back, the fuel line hooks to the larger one. the line from the breather is actually a vacume line that turns on the fuel, without it you will not get fuel out of the petcock unless it is in the prime position.

Gar

• 384 Answers
• Posted on Jul 23, 2009

SOURCE: HD 1979 fatboy fuel petcock valve leaking

Replace the petcock. The rubber diaphragm is ruptured. I'd also bet your fuel mileage dropped cause the ruptured diaphragm is allowing raw fuel to be sucked into the intake manifold.