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Ok have a crazy question here. One of my customers bought a chopper with a 67 triumph 650 motor in it that I'm rebuilding for him. He want to put a 200 or larger rear tire on it. Has anyone ever seen this done? If there was a way to do it with a friction drive or something else, would the engine be able to handle it? I'm thinking that this might be a little too much for the bike personally.
 

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Not sure what you mean by a "friction drive", but a jackshaft could be employed. The problem is, you'll be using a huge chunk of the engine's power to drive through the jackshaft AND to turn that huge unsprung rotating mass.

It might LOOK cool (to a certain percentage of any given crowd), but it's hardly worth it, in my opinion.
 

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I've seen it done with an intermediate jack-shaft ... I agree with Paul, though that it would hardly be worth it ...

The engine is always going to look way old school ... seems a shame to stick it in some modern looking fat-back chopper.
 
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