Can anybody tell me Sportmaster/Imco lower unit gear ratio by lower unit turns.
Without pulling gears.No uppers attached.
Thanks.

Turn prop shaft 10 times, count turns on upper, divide by 10.

Easier than trying to determine if shaft turns 1.35 or 1.5 times

for example -

prop x 10 and vertical shaft 15 = 15/10 = 1.5
prop x 10 and vertical shaft 12.5 = 12.5/10 = 1.25

Thanks Marc.