I have a winters reverse mount bell housing and starter set up. I am running a Bert flywheel right now but had same issue with my they motor and falcon flywheel.
The issue is the starter will not engage most of the time, just spins/grinding noise and no motor engagement. I replaced the spring on the idler when I changed motors and same issue with the new motor... Acts like an old school standard starter that needs shimmed different. Anybody else have this issue? Just replace all idler gear parts, shaft, bushings?
This bell housing has been cracked and rewelded, but worked fine after reweld for a while.