I had just finished installing some aftermarket parts from Nova R/C ( 3 shoe clutch, billet heat sink and billet cooling head). After I was finished I tried to turn the engine over with the roto start, and it would spin, but the engine would not, I then used a cordless drill in reverse and it would turn the engine over that way. I am just wondering what would cause the engine to not turn the right way , I didn't remove the roto start, and it seemed to work just fine the last time I used it. Any help would be appreciated, as I am new to this vehicle and am LOST right now.