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This problem has plaqued me for over a year and my bike has run poorly. It was like a friend that has been sick for so long you thought he would never get well. I had the carbs out twice which was a real wrestling match. But it was always plug number two that was fouled and no others. The bike was a 1981 GS650L with about 45K miles. BUT after staring at the carbs for a long time and turning them over I found #2 has an extra hole in the venturi where the vacuum line attaches. Finally the light went on. It's getting extra gas in the vacuum line because the petcock diaphragm has a hole in it. Sure enough, I put a rubber line on the petcock and sucked on the vacuum line and it started to gurgle and gas ran out. I put a diaprhagm kit in the petcock, replaced the fouled plug and my friend is BACK. HALLELUJAH. I rode a hundred miles yesterday just to celebrate. Yaahoooooo!
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Anytime number 2 gives you a problem the petcock is the first place to look. -
I just spent a mere two weeks lamenting the passing of my dear ol 650G(L) because I thought I had holed a piston or valve in cylinder #1, but when I finallly checked the pipes I realized it was 2 that was cold.
replaced the petcock diaphram with one from the 850 and voila, problems solved!! (aside from the fact that I can outrun the fuel flow at highway speeds, but at least I know what to fix)
I never realized it would actually let that much gas thru to DESTROY the performance! 8OComment
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ON the older slide carbs pre 1980 it would be the #3 carbComment
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