Polaris 2007 Two Stroke Service Manual page 64

MAINTENANCE
7. Continue to rotate the crankshaft in the normal direction of rotation until the dial indicator reads .100" (2.54mm) after top dead
center (ATDC).
8. Bend the pointer or move the degree wheel until the pointer aligns with a 180° mark on the degree wheel.
9. With the pointer aligned, make sure the degree wheel and pointer are secured and will not move out of position. Re-check
accuracy of this location a few times. The pointer should align with the 180° mark when the dial indicator reads .100" (2.54mm)
ATDC.
NOTE: Do not move the crankshaft, degree wheel or pointer after the initial setting on the MAG end cylinder -
simply read the wheel and dial indicator.
10. Remove the dial indicator and install in PTO cylinder. Repeat finding TDC. Note the degree wheel indication when the dial
indicator reads .100" ATDC. It should be 180° (+/-2°) from the MAG cylinder mark.
Symptoms of an out of index crankshaft can include but are not limited to the following:
• Difficulty calibrating carburetor (repetitive plug fouling on one cylinder with no other cause)
• Unexplained piston failure on one cylinder (i.e. severe detonation, broken ring lands, piston holing)
• Excessive vibration of engine, back firing, etc.
• Rough idle, poor top speed.
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