1998-2004 Honda Foreman 450 factory service manual, Page 384Get this manual
IGNITION SYSTEM
IGNITION TIMING
If the engine must be running to do some work, make sure the area is well-ventilatedNever run the engine in an enclosed areaThe exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and may lead to deathRun the engine in an open area or with an exhaust evacuation system in an enclosed areaWarm up the engineStop the engine and remove the timing hole capRead.the instructions for timing light operation
Connect the timing light to the spark plug wireStart the engine and let it idleIDLE SPEED: 1,400 100 rpm The ignition timing is correct if the" F" mark aligns with the index notch on the left crankcase