Whats wrong with my bike??? Only runs while in "PRI"

[dward511]

Ok so my bike is only running when the fuel valve is on the "PRI" position? Why could this be? My manual says that this is bad for the bike and that it should always be left on the "ON" position. I took apart the carbs and cleaned those and it ran fine on the "ON" position but then it died while on the highway and the only way it would run and start is if i put it to the "PRI" position. I don't know what to do...

I am also wondering if anyone has a right side blue cowling available?

[jeremy_nash]

sounds like the vacuum line is off where it connects to the left carb. could be on the petcock side, or on the carb side.

[dward511]

So what do you suggest that i do? And where is the vacuum seal? Could it be anything else?

[arbakken]

one of the carbs has a vacuum line that goes to the petcock. This is probably not attached. If it is, the petcock may need a rebuild