2010 Arctic Cat DVX 90 / 90 Utility ATV Service Manual, Page 66Get this manual
3Install the timing inspection plug RegulatorRectifier
The regulatorrectifier is located near the batteryVOLTAGE 1Set the meter selector to the DC Voltage position2Test between the black and white wires (with the regulatorrectifier plugged in)3With the engine running at constant 3000 RPM, the meter must read 12.1-15.2 DC volts
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
Headlights
The connectors are the two-pronged white ones under the front fender assemblyBULB VERIFICATION Visually inspect the bulb for broken filaments, blackening, or loose bulb baseVOLTAGE
NOTE: Perform this test on the main harness side of the connectorsThe engine must be running for this test
Ignition Timing
The ignition timing cannot be adjusted; however, verifying ignition timing can aid in troubleshooting other componentsTo verify ignition timing, use the following procedure1Attach the Timing Light (pn 0644-296) to the spark plug high tension lead; then remove the timing inspection plug from the right-side crankcase cover2Using the Tachometer (pn 0644-275), start the engine and run at 4000 RPM; ignition timing should be 28 BTDC ("F" mark)