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Robert M. Pirsig
Zen and the Art of Motorcycle Maintenance

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Camshaft position when adjusting valves on a scooter

Adjusting valves is a simple thing to do if you know what you’re doing. You should always adjust the valves when the piston is at the end of the compression cycle at TDC. In this position:

the valves are closed cam lobes are pointing downwards

The later is valid for scooters with single overhead camshaft […]

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