Problem with vacumn - Suzuki GSX-R Motorcycle Forums Gixxer.com

 
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post #1 of 4 (permalink) Old 05-19-2017, 06:37 PM Thread Starter
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Problem with vacumn

My 93 750W will only run on prime. The petcock is new and the vacumn line is not clogged. Any ideas?
wrenchead is offline  
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post #2 of 4 (permalink) Old 05-19-2017, 08:57 PM
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Re: Problem with vacumn

This isn't a technical forum, guessing you'll get more answers in the water cooled forum so, I'll move this.
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post #3 of 4 (permalink) Old 05-19-2017, 09:51 PM
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Re: Problem with vacumn

Quote:
Originally Posted by wrenchead View Post
My 93 750W will only run on prime. The petcock is new and the vacumn line is not clogged. Any ideas?
Put a piece of fuel line on your petcock, disconnect vacuum line and draw a vacuum on the vacuum line with your mouth.
See if it flows in the "ON" position.
If it doesnt, you have a petcock stuck diaphragm issue. If thats the case, you'll have to pull the cover off the back of the petcock and free up the oring on the diaphragm plunger.
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post #4 of 4 (permalink) Old 05-20-2017, 03:08 PM Thread Starter
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Re: Problem with vacumn

Thank you for the suggestion. That helped me pinpoint the problem. The diaphragm was taken apart - reassembled and put back on the tank. It now runs great in the 'On' position.
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