Thanks to everyone. I signed up on a Honda ATV forum and 3 or 4 replies on there said it is the CDI box(module), as did Mashbox and John T. They said it is common on the older Honda quads. I found one aftermarket for less than $60.
One reply said that the bypass circuit in the CDI box fails. The box is sealed, and not serviceable. It still puzzles me why a magneto type ignition would do this. Separate circuitry from the battery/starter side of the system.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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