Positioning of petcock

[Splittie]

On my 81 750L, I think I am missing a part off of my petcock.
The only thing visible on the thing is a small white slotted plastic piece inside.
If you turn it, it just spins and spins, WHAT GIVES??
Pics of your petcock would help :?

[chef1366]

I have the same petcock. The slot up and down is prime and back and forth is run.
You have an 80 bike with an 81 title.

[Zooks]

I can't show you pics of my pet cock on this forum. But if you'd like me to send you some 'special' emails, well...........................?????


LOL

[chef1366]

I can't show you pics of my pet cock on this forum. But if you'd like me to send you some 'special' emails, well...........................?????


LOL

[paco13]

Thats wierd I have the same kind and it doesn't matter where the slot is positioned it always needs vacuum to flow fuel. It is after market purchased from Z1 enterprizes.
Chef, is yours a factory Suzuki?

[chef1366]

Yes. In the prime position you do need vacuum to activate but not continuous. Give it a quick suck and it should flow until you put it back on run. On run it needs a constant vacuum.

[paco13]

learn somethin new......
I'll give it shot

[Splittie]

OK I am a bit confused, what position do I need it at when starting the bike? And when running? :?

[chef1366]

Parallel to the ground is run.

[Splittie]

So what is the prime position for?
Straight up/down = Prime
Left/right = Run
Correct?

[fnickel]

Priming

Prime is for filling the float bowls after the bike may have been standing for a long time without running, and the fuel evaporates out of the float bowls. It saves you from cranking the engine over until there is sufficient fuel in the bowls to start the engine. Or after you have rebuilt the carbs, to get the initial fill of the bowls to allow the engine to start. I have found the same thing, that in the prime position, the fuel won't start running unless it gets a momentary shot of vacuum. After that it will continue running without vacuum.