have you ever tried to pullstart a brand new, non broken in high compression engine on an r/c truck like the .21 on the HPI Savage? That's a serious pain in the....let's just say hand here. Now, consider trying to do the same thing with say, oh, an OS 91. Worse yet, try that on a Moki 2.10. I'll stick to flipstarting or using my trusty electric starter. Just wish I had one for my Savage.