From:chuck maize Electronic:hcmaize -A- basicisp.net
Subject:165/175 jug, etc. Date:Sun Oct 16 03:02:54 2011
Response to:16428
Since the 175 has longer stroke, how about the 175 cylinder height? How about the 175 cylinder head? My 175 was destroked with more available 165 flywheels during a rebuild, and wonder if it lowered the compression in the original cylinder? If so, how about milling the head to compensate?

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The 165 175 have the same bore, the 175 has a longer stroke.

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I need to replace the pistong rings on my 1963 175BTH motor. I can only find listings for new 125cc and 165cc rings on sites such as harleyhummer.com. Are the piston and rings in a 165cc and 175cc the same?