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Old 08-19-2010, 08:53 AM   #16
Particle Man
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Join Date: Nov 2008
Location: Central NY
Moto: 2003 SV650S
Posts: 14,959
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Quote:
Originally Posted by Rider View Post
Yes, air box was clear, plugs were still white and new looking(only about 200 miles on them), fuel filter looked ok. What I found though was a loose screw in the gas tank. Apparently one of the 1 1/2" screws from the bottom of the gas cap fell into the tank. Took a magnet fished it out and it seems to run much better. It idles now. I'm guessing that the screw was blocking fuel flow through the petcock but that doesn't explain the backfire when closing the throttle. I didn't have time to take it for a test ride but it's at least idling smoothly so it's a start anyway.
How lodged was the screw? Maybe when you let off the throttle the bike rocked forward a bit and the gas shifted letting more fuel through and dumped a whole bunch of gas in all at once...?
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