remove the timing inspection hole cap located on the left side of the engine and connect the timing light and tachometer.
start the engine and let it run until it reaches normal operating temperature. with the engine idling at the specified rpm, check the timing by aiming the light into the inspection hole.
The timing is correct if the F mark on the generator motor is aligned with the index mark on the left crankase cover.
if the marks are not aligned remove the pulser generator cover (located on the top left side of the engine) and loosen the baseplate mounting screws slightly. turn the baseplate as required by inserting a screwdriver into the slot at the right side of the plate.
This is just going by the Haynes honda workshop manual. it says the full advance timing is 30 degrees plus or minus to degrees below top dead center at 3350 rpms.
hope this helps
im just goin by my book, ive never had to adjust it before
1983 Honda ATC 200x-shes a beater
Past Rides:
1982 ATC Big Red 200e (miss it more than i thought i would)
1985 200x rode it for about a mile