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Originally Posted by grotbag  So what is it and what does it do? (a pic would help too please?)  |
The camshaft/camshafts on an overhead camshaft 4 stroke engine run at 1/2 the speed of the crankshaft so te inlet and exhaust valve timing is maintained accurately, the cam chain drives the camshafts.
Some engines use bevel gears to drive the overhead cams but these are very tricky to set up when rebuilding an engine so that there is no play in the driveline.