Oldfeller--FSO
Serious Thumper ModSquad
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Hobby is now "concentrated neuropany"
Posts: 12671
Fayetteville, NC
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If you make a point of getting the electronics with the engine (black box computer, etc) all engines can go into any frame. Older engines are 4 speed but the 4 speeds match up ratio wise to the same top end speed as the newer engines.
Newer engines have better starter motor set ups compared to the very old engines.
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Your problems can come from mix and match, i.e. the wrong electronics on the old bike for the new motor you just got.
Most folks breaking down a wrecked bike will send the electronics with the motor if you request it for a moderate extra few dollars.
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