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identifying my engine, HELP

chris812

New member
I need help trying to identify my engine. According to the model sticker on the front it is suppose to be a 1966 33hp johnson engine. Well i bought the service manual for it and it seems to be identical so far except for the head and the bore in the manual says it should be 3 1/16. well when I measured it it was 2.88 in for the bore hmmmmmm. so I looked for a number I found one on a round spot near the head. the number is 2283404 and it has a symbol of a horse above the number. any ideas?
 
It is quite possible that it has an earlier 28 HP powerhead installed.----A direct swap.------Any pictures of the powerhead / cylinderhead ?
 
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