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GS1000S Petcock

Vmass

Vmass

Forum Sage
Past Site Supporter
Can someone explain the operation?

Should fuel come out ( gravity fed ) when diconnected?

Also, is it simply a quarter turn to the left for prime?

Thanks
 
I explained in your other petcock thread how it works... http://www.thegsresources.com/_forum/showthread.php?t=174958

That model petcock has two positions: ON and Prime

When set to ON, gas will flow when there is vacuum pulling at the diaphragm. No vacuum, no gas.

When set to Prime, gas will start to flow after a pulse of vacuum draws the diaphragm open. Then the gas will continue to flow until you turn the lever back to ON. That model petcock has a check valve imbedded into the body. If the check valve is bad the prime feature will not function. The pulse of vacuum draws the diaphragm open, and the check valve keeps it from returning until the lever is turned (90 degrees).
 
Last edited:
The POS tap then.....

This should help:

Petcock-ServiceManual.jpg
 
Expanding on my question..... How do you know what position it is set in?It appears as though it will continue, full circle, with out the feel of a stop.
 
There is no stop - you can spin it round for ever. It's on prime when the slot is vertical. It's a POS and not Suzuki's finest hour.
 
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