The rear sprockets on the CA95 & 160 are mostly 36 tooth. You probably have a 16 tooth on the engine. You can go down to a 12 tooth on the engine to gain more low end torque, but you sacrifice high end speed. You can go with a bigger rear sprocket if you don't use the chain guard. I replace chain and sprockets for my restore projects as a matter of habit and use standard sizes.
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