1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 227Get this manual
ENGINECOOLING Crankshaft Indexing 7With the pOinter aligned, make sure the degree wheel and pOinter are secured and will not move out of positionRe-check accuracy of this location by repeating steps and 5The pointer should align with the 180 or 120 mark when the dial indicator reads .100" (2.54mm) ATDCIMPORTANT: Do not move the degree wheel or pointer after the initial setting on the mag end cylindersimply read the wheel and dial indicator
8Remove the dial indicator and install in cylinder #2 (center)Repeat steps and for cylinder2Note the degree wheel indication when the dial indicator reads .100" ATDCIt should be 180 or 1202) from cylinder #1Proceed to PTO cylinder (#3)Cylinder #3 should also be 1200( 2} from cylinder #1 Symptoms of an out of index crankshaft can include: Difficulty calibrating carburetor (repetitive plug fouling on one cylinder with no other cause); Unexplained piston failure on one cylinder (i.esevere detonation, broken ring lands, piston holing); Excessive vibration of engine, backfiring, etc Rough idle, poor top speed