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Old 08-13-2014, 08:24 PM   #1
Tonedef84 OP
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Joined: Aug 2014
Location: Redford, MI
Oddometer: 7
'83 CB550SC Nighthawk conversion question

So, I have a 1983 Honda Nighthawk CB550SC. The clymer manual and a few online resources i found say that the 550 and 650 motors on the Nighthawks in that year shared many of the same parts. My question is this: I am wondering if anyone has converted the 550cc motor to a 650cc motor, and what parts (aside from the cylinder head and pistons) would need to be changed. I haven't been able to find any information regarding swapping parts from a 650 block to a 550 block. As far as I can tell comparing photos and actually seeing a mint CB650SC they use the same crankcase, transmission, exhaust and carbs.

TLDR; Can you swap the cylinder heads and pistons from a 1983 CB650SC Nighthawk to a CB550SC Nighthawk motor, or is it more involved?
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