1986-1991 Kawasaki 650 X-2 Service Manual, Page 73Get this manual
ENGINE BOTTOM END 79
Crankshaft Maintenance
The crankshaft changes the reciprocating motion of the piston into rotating motion to drive the jet pumpCrankshaft trouble, such as excessive play or runout, will multiply the stress caused by the intermittent force on the piston and will result in not only rapid crankshaft bearing wear, but also noise, power loss, vibration, and shortened engine lifeA defective crankshaft should always be detected at an eady stage and repaired immediatelyThe fol'lowing explanation concerns the most common cran kshaft problems and the method for measuring play, run out, and con-rod al.ignmentIt does not cover crankshaft disassembly because of the highly specialized equipment that is requiredIf crankshaft components become damaged or worn, the entire shaft should be replaced as an assembly, or rebuilt by properly equipped shop