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Main > Encyclopedia > Rocker Arms & Shaft

In order to reduce friction and weight, L-shaped, roller rocker arms are mounted on a single shaft. A narrow valve angle (30 degrees) and a compact combustion chamber contribute to an increased swirl ration of the air/fuel mixture, leading to better combustion.

Timing Chain System

Crankshaft rotation is transmitted via a silent type timing chain to the camshaft sprocket.

The illustration below shows correct timing when the crankshaft pully is at TDC.

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