My beef with the mavrikk starter, which will crank a mean airplane engine, is that being geared its slow. When it pushes the motor over compression it can't keep up with it so the crankshaft is waiting on the starter at BDC. The end result is it sounds like an impact gun and it chews up starter couplings, the hex ball on the start shaft, and if you are really not living well, it will take out any one way bearing in the clutch like the Raptor.