Question about 2001 Yamaha YZF 600 R thunder cat
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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Posted on Jan 02, 2017
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