Question about 1982 Suzuki Gs 550 L

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Not running on #3 cyl' on my 1982 gs550

Fires up on button, compressions good, all float levels are even & plug gets wet , there is good spark at plug i am at a loss i'm thinking possible valve timing ??

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Not likely valve timing if it will run, cams are one piece so if one is right all are right. Have you checked compression with a gauge, or just by feel? Try swapping the sparkplug wire with the #1 cylinder and see if the dead cylinder moves with the wire. Also try moving the spark plug to another cylinder and see if the dead cylinder moves with it. If the compression is indeed good, the problem will be with the spark plug/ wire, or in the carb, these are the only things that can kill a single cylinder. The coils run a pair of cylinders so a bad coil would put out 2 cylinders at the same time. Start with the spark plug, I have seen a perfectly good looking plug, that would fire whun held to the head, but would not fire in the cylinder.

Posted on Jun 04, 2010

Testimonial: "thnx did check all that plug lead found to have intermittent fault sorted now cheers "

  • Chan Zilla Aug 01, 2011

    Sounds exactly like my situation. 1977 GS550, my #3 isn't firing. The original spark plug is oil-fouled, but the engine runs otherwise okay (I haven't gone above 50mph so far, but feels nice all the way there). It was horrible to start, but after cleaning air intake filters, new plugs and oil filter and new oil, she starts a lot better on a warm day today. However, when hosing her off, I noticed that the #3 exhaust pipe isn't burning off steam like the others. This is my first bike, and I'm waiting for the shop manual in the mail any day, but in basic terms, what would I be looking for in the carberator? I think the engines are essentially the same? so would swapping spark plug cables between 1 & 3 be a good idea for me as well?

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It seems that you have done all the good stuff, so my advice is a shot in the dark. Sometimes when Lawn mowers are put away for the winter, the fuel left in them will become stale. Remember it is not the fuel that burns, but the fuel vapour. If the fuel is stale it won't vaporise properly. I would suggest that you empty all the old fuel out and put some fresh fuel in.
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