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Understanding Cam Gear Ratios
TBolt USA Tech Database!


TECH-0114


4 Stroke engine crankshaft/camshaft gear ratio is always 2:1, which means that for every two revolutions of the crankshaft the camshaft will rotate through one revolution.
This is a 2:1 ratio and must always remain
The top cam sprocket will have twice as many teeth as the crankshaft cam-chain sprocket.
Typically, Honda 50 and 50-110cc Chinese engines and Lifan 140, have 28 tooth cam sprockets.
Jailing and GPX and YX 140 engines have a 32 Tooth cam sprocket.
When installing a performance camshaft you may replace the cam sprocket but only due to the bolt pattern.
The new cam sprocket must have the same tooth count as the original sprocket.

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