- Apr 9, 2018
I weighed both the stock piston with the piston pin and rings and the big bore windowed piston and they are both 3.7 oz. My question is can I use the big bore cylinder and piston without using the crank that I bought. The crank needs trued by a machine shop since I was a noob at engine building and hammered it too much probably. I bought a pk80 style engine with 8mm mount studs and was hoping to just install the big bore cylinder and piston on that. The only thing is that engine is silver while the big bore cylinder is black. Maybe I could take the black covers and put it on the silver one. If both pistons weigh 3.7 oz there should be no problem right? I heard it's the weight that can unbalance the crank or whatever. I know it would have more power with the stroker crank but I don't really want to take it to a machine shop right now. I might use it in the future on a stock 66cc engine.