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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1 Answer

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Intermittent


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hey there matey,, just to run a few things with,, have u taken the spark plug out and cleaned it up,,try a new plug 1st,, to be sure, or if u have a new plug,, take out the spark plug place it back in its cap and rest it on the cylinder head and either elec start it or kick it over and make sure u have a spark ,, if all is ok on the above,, then turn to fuel and carburetta, make sure fuel is gettin to the carb 1st,, but u say u do eventually gettin it goin ,,then theres a blockage in jets ,,undu the bottom of the carb clean out the bowl, ,in the carb u will see a brass jet, un screw that and the needle guide that the jets screwed in to and using a pin or needle,poke the small hole clean so u can see light threw them,, bung it all back together and pray,, if no joy il get back to ,, ok m8, enjoy

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