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June 11, 2017 at 11:48 pm
#59490
My Special Tools Instruction sheet lists this
pn 383603 3 & 4 hp engines
pn 383602 all 5 thru 20 (except 1974 and later 9.9 an 15) & 1969 and later 25 hp
pn 386636 all 9.9 & 15 1974 and later
pn 383601 all 22 thru 40 thru 1961
pn 378966 all 28, 33, & 40 hp 1962 thru 73
pn 386635 all 40 hp 1974 and later
print date 2/78
now you know.
Ed