Polaris Virage TX 2000 Service Manual page 257

ELECTRICAL
Ignition Timing Adjustment - Virage TX / SLX / Pro 1200 / Genesis
Dynamic (Running) Ignition Timing
When replacing a CDI box on a VirageTX/SLX/Pro 1200 or Genesis, it is very important
to check timing. A new CDI box may be programmed slightly different than the one be
ing replaced, causing ignition timing to be advanced or retarded too far.
NOTE: Always verify timing of engine at room temperature only (68° F/20° C).
Verify the ignition position at maximum advance (3000 RPM) when checking the timing.
If engine damage has occurred due to a suspected ignition related problem, check the ignition timing at the speci
fied operating RPM.
Always dial indicate the timing mark before attempting to adjust the ignition timing. To indicate the marks:
1. Remove timing inspection plug from starter cover.
2. Remove front (Mag) cylinder spark plug and install
dial indicator.
3. Rotate crankshaft by hand while observing dial
indicator. As the piston touches the indicator
plunger, the dial will begin to rotate. Find the exact
point where the pointer stops rotating and reverses
direction. This will be Top Dead Center (TDC).
4. While holding crankshaft with piston at TDC, zero
indicator by rotating bezel until "O" on dial and
pointer align.
5. Rotate crankshaft oppositethe direction of rotation
about .200" BTDC (2 pointer revolutions).
6. Rotate the crankshaft in the normal direction of
rotation to .081" (2.06mm) BTDC.
7. Using a fast drying white ink, mark the flywheel in
line with the projection in the inspection hole to
make it easier to see with a strobe light.
8. Verify proper piston position by repeating steps 2 - 5.
9. Remove dial indicator and install spark plug.
10. Connect a tachometer according to
manufacturer's instructions.
11. Connect a timing light to the front (Mag) cylinder.
Start engine and increase RPM to 3000.
Dial Indicator
Never operate engine for more than 15 seconds with
out cooling water. Severe engine damage may occur
from overheating.
Mark flywheel
in line with
projection
View through
timing hole
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