Ok I have a MGT and I took it out in the back yard the other day and made about 5 quck laps, it cut off.I tried to start and it wopuld not move.I took the pull start out and the spring was all tangled,oh this has a roto start to that I usually use, this is a brand new pullstart, I wind it up and then it still would not pull.I awesome the motor was trashedbecause the OWB would not seat onto the conn. rod.I have a brand new, broken in 457 XTM I put it in I drove it around and the same exact thing happened again.I look at the XTM since this is twice now and the piston moves perfect left to right , but to get it up top it has to be forced.DId I install something wrong, does the OWB sit on the conn. rod, and the roto shaft does it go all the way in, or does it just goes to the rod.....