[carlou]

Carlou, your conversion is looking good. That 9mm thread looks like it could be 9x0.5mm but that will need to be measured correctly.
Will aluminium be fine to put up with the torque from the motor? Or do you think brass might be the go? Plus the rotation of the motor, will that be clockwise looking from the base of the motor so that it will always be tightening the thread and not loosening?

The pinion was originally connected to the clutch bell as shown in the video. The clutch bell is made of Aluminium so I assume using an aluminium pinion adapter will work. But I am happy for better suggestions. Inside the clutch bell is the clutch bolted on the engine with a 6mm shaft connected to the starter adapter. The clutch bell and the clutch itself will be replaced by the Pinion adapter. I'm really hoping somebody can lend a hand on this adapter.

The motor I am planning to use has also a shaft diameter of 5.98mm as shown. According to my calculations, this motor will give me 1950RPM (85% of no load speed) on idle up easily on 12S LiPo with a gear ratio of 95T/11T. So there is still ample power for the throttle pumps.