9/16″ bore would fit KE4, Mark 7 and KE7. A 5/8″ bore would fit KG7
and KG4. KF7 had toothed clutch so
both prop shaft and prop have spline and notches…can be converted by changing prop and shaft to use shear pin,
K40 and K42 may be same diameter and pitch with different blade
area or profile. Owners also
bored out or sleeved to use on
unintended motors. I have a K42
that had been drilled out to 5/8″ I had bored and sleeved back to
original 9/16″. I believe Michigan Wheel probably knew best
because they tested and suggested
boat and motor applications.
Mercury went much further, testing props, boats and Mercury
outboards and issued Boat House
Bulletins so dealers could sell
proven combinations.
my much overprice 2 cents worth,
Louis
