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Mini Dirt Bikes & Pit Bikes Forum

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  1. James Geiger

    Can I use the top end of a 125cc motor " TZH157FMI" On my 50cc motor " 139FM-2 (D)" bottom end? It has the four-speed transmission in it.

    Can I use the top end of a 125cc motor " TZH157FMI" On my 50cc motor " 139FM-2 (D)" bottom end? It has the four-speed transmission in it. I've already tried putting the top end on and achieved it. But I didn't use the 125cc piston rod. The 125cc transmission is an automatic. That is why I have...
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