Harley J-JD. 61CI COMPARE TO A JD 74 STROKE. 1924.

[John Mertens]

Could anyone tell me were the differance is on a 1924 J 61Ci and a 1924 JD 74CI is. is the rods longer on a 74 or is the crank pin located lower on a 61 ci fly wheels. or the 74 located higher on the fly wheels. are the pinion shafts and sprocket shafts located differntly. or are they the same. also is there a differance in the rods.or are the pistons location different, any help please. thank you amca 13300, Johnny.

[sswaney]

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Could anyone tell me were the differance is on a 1924 J 61Ci and a 1924 JD 74CI is. is the rods longer on a 74 or is the crank pin located lower on a 61 ci fly wheels. or the 74 located higher on the fly wheels. are the pinion shafts and sprocket shafts located differntly. or are they the same. also is there a differance in the rods.or are the pistons location different, any help please. thank you amca 13300, Johnny.

J Models have a 3 1/2" stoke and standard bore is 3 5/16". JD Models have a 3 31/32" stroke and standard bore is 3 7/16. I believe the rods are the same. Hope this helps.