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To verify ignition timing, use the following procedure... this is from the svc manual.

1. Attach the Timing Light (p/n 0644-197) to the spark plug high tension lead; then remove the timing nspection plug from the left-side crankcase cover.

2. Using the Arctic Cat Engine Tachometer (p/n 0644-275), start the engine and run at the recommended
RPM; ignition timing should be the recommended degrees BTDC.

3. Install the timing inspection plug. If ignition timing cannot be verified, the rotor may be damaged, the key may be sheared, the trigger coil bracket may be bent or damaged, or the CDI unit may be faulty.

IGNITION TIMING
MODEL TIMING/RPM
400 10° BTDC @ 1500
500 10° BTDC @ 1500
650 H1 10° BTDC @ 1500

Sorry, that was for a 2006, and not a 2000.
 

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so could you advance the timing a few degrees to get a lil more "umph" out of the 400? or do you have to rotate the cam?
 
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