Timming is set through the CDI unit. To adjust the valves, first remove the fan shroud on right side of engine to expose the flywheel, next remove the valve cover. Turn by hand clockwise the fan until the large hole in cam sprocket is up and center in relation to the head and the two small holes or lines in cam sprocket are paralell with the top surface of the head. Next look at the flywheel, there will be markings inscribed T & F. The T should be lined up or fairly close to the pointer on the case. It is not unusual for the T mark to be 1/4 to 1/2" off the pointer, this just indicates advanced timming. If the T does not line up with pointer you are 180deg out, rotate engine clockwise until cam sprocket marks line up. You are now at TDC. Now adjust the valves, intake to .003" and exhaust to .005". The valves must be adjusted on a cold engine.
Tom
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