Originally Posted by
fyrstormer
It occurs to me that the backplate obstructing the entryways to the transfer channels is a problem that only occurs with non-pullstart engines. With pullstart engines, the extra clearance required for the pullstart assembly to fit in the crankcase also prevents the backplate from obstructing the entryways to the transfer channels.
No it is not that. RTR engine makers just do not care the most optimized flow in an engine to get a good power and best milage. The racer wants to have any improvements, how tiny they can be.