There are 2 models from '63 at 28hp - models 28302 and 28303. Model 28302 is a standard length shaft for 15" transoms and 303 is for 5" longer for 20" transoms.
50:1 all of the Johnson evinrude up to 1963 when they changed to 24:1
24 to one
1959 thru 1963 Johnson and Evinrude use a 24 to 1 ratio. 1964 and up is 50 to 1
the fuel oil ratio for this engine is 50:1
The correct spark plug for a 1963 Evinrude 10hp outboard is typically a Champion J6C or equivalent. The recommended spark plug gap is generally around 0.030 inches (0.76 mm). Always consult the owner's manual or a trusted source for specific details related to your engine model.
1963, 9.5 hp
50:1
No.
1963
24-1 until 1964, then 50-1
1963 5.5 HP
your 9.8 hp mercury is a 1964, unless its a white motor then it could be a 1963