Maintenance « motoetc.com – Online Magazine for Motorcyclists, Scooterists and Technologists.

Cylinder and piston health – compression check VS leak check

Compression check is probably the first thing that comes to mind when coming to check a motorcycle. Compression check is done by removing all the plugs in an engine, and inserting a compression gauge on the cylinder. The starter is then engaged, spinning the engine and the piston is producing a compression which is tested. […]

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 […]

Cylinder and piston health – compression check VS leak check

Camshaft position when adjusting valves on a scooter

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