LouisB

I bought an OS 15 CV-A DF unit with a pullstart. I wish to use the engine as a normal fixed wing unit and I therefore removed the pullstart. Why does the backplate extend into the engine, as it is normally the case with any 2-stroke motor? What would happen if I just fit a flat piece of alluminum plate to the back? I guess it would affect the gasflow but why?

up_in_smoke

i beleave it also stops the conrod from sliding off the back of the crank but i could be totaly wrong

fizzwater2

My Feedback: (61)

It also reduces the crankcase volume, probably would run very poorly right up till the connecting rod came off the crank pin

ThumbSkull

My Feedback: (57)

Yeah, it serves the purpose of holding the connecting rod on as well as lessening the volume under the piston creating better vacuum for pulling in fresh air/fuel mixture.

LouisB

Thanks guys, your answers make sense.