1991+ Kawasaki 650 SC Factory Service Manual, Page 88Get this manual
7-10 ENGINE BOTTOM END
Crankshaft Ma,intenance
The crankshaft changes the reciprocating motor of the piston into rotating motion to drive the jet pumpCrankshaft trouble, such as excessive play or runout, wiU multiply the stress caused by the intermittent force on the p.istonand will result in not only rapid crankshaft bearing wear, but also noisepower loss, vibration, and shortened engine lifeA defective crankshaft should always be detected at an early stage and repaired immediatelyThe following concems the most common crankshaft problems and the method for measuring playrunout, and con-rod alignment, it does not cover crankshaft disassembly because of the highly speci'alized equipment that is requiredIf crankshaft components become damag'ed or worn, the entire shaft should be replaced as an assemblyor rebuilt by properly equipped shop
Connecting Rod BendTwist Set the crankshaft in an alignment jig or in blocks on surface plateo Select an arbor of the same diameter as the connecting rod small end