Has anyone had any issues with neo tat stroke length? I have a 3.5 that has a longer stroke than my 4.5 machine. The 4.5 engine came with a wobble in the shaft and the 3.5 cuts out.. I still cant put em down even with the issues they just run how i like them. So has anyone had any issues with yours? Also my 3.5 has a red spring i dunno if that means anything.