Question about 2001 Yamaha YZF 600 R thunder cat

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YZF 600R 2001, Run well at any speed but at idle around 1000 or less which is not correct. When set the idle speed at 1200-1300 which is the correct one for the model, and give it a throttle, the RPM do not come down quickly enough. Also, when engine worms up the RPM go higher. I cleaned the caburators by the manual, thought they may be dirty or sort of. but everything seemed O.K. Put them back and the same problem.

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The fuel / air mixture is lean. This means that air that has not gone through the carburetor is getting into the engine. Old rubber seals on the intake manifold no longer seal properly. The rubber may be cracked and letting in air. Potentially, a bad head gasket or a burned exhaust valve may be the cause. I would replace the rubber fittings between the carbs and the cylinder and that normally fixes the problem. If not, do a compression check to rule out valves / head gasket.

Posted on Mar 28, 2011

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