Question about Yamaha FZS 600 Fazer Motorcycles

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Friend brought me a bike that was running rough! I found two spark plug wires disconnected. I also cleaned up the exterior of the carbs and linkage without removing anything. Now the bike revs to 5000rpm as soon as I start it. I have backed out the idle adjustment wheel on the rack and checked the cables. If i restrict the air with my hand on the aircleaner it will idle down.

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Somewhere between the carbs and the cylinder there are air leaks. Cracks in rubber fittings or seals, clamps on hardened rubber manifold material may no longer seal well, intake manifold to cylinder bolts may be loose. A loose spark plug, bad head gasket and burned exhaust valve can let un-carbureted air into the cylinder as well.

Posted on Mar 25, 2011


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