If both motore were made by the same manufacturer say lifan for example then it is very possible the gears could interchange. On a motor with reverse it may by even more likely. I know that on my yerfs , with no reverse, I have never found a gear with the same spline count that would work as a direct replacement. If you have found something that works. Thats very welcome news. I have dieing to mess with different gear ratios. There are several ratio charts on line, mostly in MX vender sites that give a prety good idea of what a simple gear change can do.
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