Doesnt sound to me like he is altering the wheel base. He just wants to know if there will be any problems running the pulley that low on the engine.
I think I have sunburned my brain. Not many run rear engine riders, you will have to
invent alot of what you want to do, and trial and error your racer. Anything is possible
with that pulley out that far. I personally do not know anyone running a rear engine mower.
Would it work with the pulley on the end of the crank, yes, as long as it bolts on. Will
it stay for a while, not sure how long. There will be more pressure on the seal and the
case due to the leverage. A third bearing support comes to mind.