1992-1995 Kawasaki 750SX Service Manual, Page 86Get this manual
ENGINE BOTTOM END 7-11
Crankshaft Maintenanoe
The crankshaft changes the reciprocating motor of the piston into rotating motion to drive the jet pumpCrankshaft trouble, such as eXlcessive play or runout, will multiply the stress caused by the intermittent force on the piston and will result in not only rapid crankshaft bea.iring wear, but also noise, power loss, vibration, and shortenecl engine lifeA defectiv,e crankshaft should always be detected at an earl,y stage and repaired immediatelyThe following, explanation concerns the most common crankshaft problems and the method for measuring play, runout, and con-,rod alignment, it do,es not cover crankshaft disassembly because of the highly spec.ialized equipment that is requiredIf crankshaft componentsbecome damaged or worn, the entire shaft should be replaoedas an assembly, air rebuHt by properly equipped shop
Connecting Rod BendTwist Set the crankshaft in an alig:nment jig orin blocks on surface pilateo Select an a'rbolr of the same diameter as the connect.ingrod small end and at least 00 mm long, and ilnsert the arbor through the connecting rod small endOWith the connecting rod held ve,rticaHy, use height gauge to measure the difference in the height of the arbor above the surface plate ov,er 100 mm length to determine th,e amount of connect rod bendIf connecting rod bend exceeds the service limit, the connecting rod or crankshaft must be lre'placedConnecting 'Rod Bend Standard: Under 0.051100 mm Service Limit: 0.21 00 mm