That would be a fun toy for sure. I am guessing compression should be in the 140-150 range on the 250R. A while back I was considering finding a 250 Odyssey and using the whole rear portion on my daughters Yerf. I think it would be a simple mod, provide plenty of power and those old 250 Odys are nearly indestructible. I would bet you could find one for the same or less than the 3 wheeler.
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