I'm putting a LRP .28 spec 3 pull start engine in a Ofna MXB that came with a Ofna p4 .21. What all will I need to put this motor in this buggy? It looks as thought the engine shaft on the LRP engine is longer and has less threads then the Ofna engine.

Can I get it to work and what clutch parts will I need? Also think I need a different fly wheel and clutch nut?