My new rebuild cranks slow when warmed up. The "old" engine did the same, but not as bad as this one. Yes, I know it is new and will probably loosen up a bit after some more run time. It only has about one hour on it now. Just looking for a reasonably priced HI Torq starter. I should have done this years ago, but what I had worked at that time, now, not so good.. I think I can "overkill" on this one if this price is right.