Polaris Virage TX 2000 Service Manual page 162

ENGINE
Crankshaft Indexing
7 . 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 by
repeating steps 4 and 5. The pointer should align
with the 120° mark when the dial indicator reads
.100" (2.54mm) ATDC.
IMPORTANT: Do not move the degree wheel or pointer
after the initial setting on the mag end cylinder - simply
read the wheel and dial indicator.
8 . Remove the dial indicator and install in cylinder #2
(center). Repeat steps 4 and 5 for cylinder #2. Note
the degree wheel indication when the dial indicator
reads .100" ATDC. It should be 120° (± 2°) from
cylinder #1. Proceed to PTO cylinder (#3). Cylinder
#3 should also be 120°(± 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.e.
severe detonation, broken ring lands, piston hol
ing);
• Excessive vibration of engine, backfiring, etc.;
• Rough idle, poor top speed.
Dial Caliper Crankshaft Indexing
Be sure to keep the dial caliper vertical, and in the center of the plug hole for greatest accuracy.
Disconnect battery ground cable and all spark plug high tension leads. Ground high tension leads to engine.
Disconnect lanyard from engine stop switch before proceeding with the following steps.
1 . Remove all spark plugs
2 . Install a dial indicator into the magneto end (Front) cylinder spark plug hole. (The ignition timing is referenced
by the mag end).
3 . Rotate the engine to bring the piston to top dead center (TDC) on the cylinder with the dial indicator installed.
4 . Locate TDC as accurately as possible by finding the center of the point where there is no piston movement,
and zero the dial indicator at this point. Do not move the crankshaft from this position.
5 . Using the dial caliper, measure the distance from the spark plug gasket surface of the cylinder head to the top
of the piston on the center and PTO (rear) cylinder. Be sure to measure all cylinders at the same position in the
spark plug hole.
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