See Mark this is what i've been talking about you have the motors to eye up. Now does this motor with the right clutch set up, start with a pull cord or starter ?? This would make a diff. I do believe that the larger heat sink would be good this is why I suggested rc car motors as apossed to rc plane. I know the o.s. motors are very reliable and long lasting. If this v-7 motor takes too much time to come in I will try this car engine set up any way it's a great thought. Alan