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Discussion Starter · #1 ·
My 2002 sv was running rough so I cleaned the carbs and put new plugs in the past week. I had cleaned the carbs earlier in the spring. This time when I opened up the top cover I found the spring and the washer from the jet needle laying in the cover on the diaphragm. After cleaning, replacing o rings and the fuel valve the bike will start and sometimes idle. If you hit the gas or let it sit though it will jump to 3,000-4,000 rpm. I found that on the rear carb it you either pull the air box or reach in the air box and lightly touch the piston valve near where the jet needle comes out of it moves a bit and the bike goes back to idle.

So I am thinking maybe the diaphragm may need to be replaced. Has anyone else had to replace the diaphragm or piston valve? I don't know if 10 years and ethanol may have made it less pliable so it is not allowing the piston valve to close? Doing the same to the front carb does nothing. The piston valve I would think is ok as is the needle jet.

Thanks
 
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