Makes sense. Thank you.OHV = Over Head Valve
OHC = Over Head Cam
SV = Side valve = L-head.
If the op is having problems with this Opposed engine starting as describe it is more likely a worn out starter which is likely worn bushings. It is cheaper to just replace the starter with a good after market starter.
Briggs Twin Cylinder L-Head Service Manual
► Yes, it could be increased mechanical friction inside the starter due to worn parts or solidified (oxidized) bearing grease.If the op is having problems with this Opposed engine starting as describe it is more likely a worn out starter which is likely worn bushings.