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John, My Mercury disc shows a KB-1, KB-1A, KB-2, KB3, KB-4, KB-4-1 serial numbers 93176 – 94425, KB-4, 95183-95317, 95721-95722, 96983-95985 . I list no numbers for KB5 which is a 11 cu. in. 2 cylinder motor. Then it skips to KD-4 models.
TheKD4-1119631-123637, 95996-123637. Should fall in this serial number 108525
. Is it a one or two cylinder motor? The KB’s were 1 & 2 cylinder & the KD’s were 2 cylinder. & your serial number is 108525. You say you have a new set of points & coil. Are you a 1 or 2 cylinder motor?
P.S. I looked in the Mercury service manual reprint white cover book & it shows Mark 7 type motors & lists the KD3 but very little data on it. It shows the KB 4 & 5 11 cu. in. motors that are older twins but little on thr KD3. I do have the original blue cover Mercury manual 1940-1965 that I will look today for serial numbers matching yours. I’m not sure on your serial number because it lists a 11 cu. in twin & I think yours is a single. Am I correct or not?