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Author Topic: 750A engine on a 550 frame? Is it possible?  (Read 1492 times)

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310_550rider

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750A engine on a 550 frame? Is it possible?
« on: August 29, 2015, 04:11:53 PM »
I'm new to Honda motorcycles and i'm interested in building a cb550 I inherited from a family member. I want to replace the stock (and seized) engine with a 750A hondamatic engine. I found a complete running 750A bike on craigslist for under $500. I feel like this would be a good investment because I can use more than just the engine from the potential donor-bike. Please let me know if the 750A engine would fit on the 550 frame without too much major modification. Also, what kind of modifications am I looking at if this swap is possible? Thanks in advance :D 
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Offline calj737

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Re: 750A engine on a 550 frame? Is it possible?
« Reply #1 on: August 29, 2015, 07:35:59 PM »
Huge effort to make it fit. The 750 is much larger, heavier, and taller. Very easy to source a used 550 motor, or tear it down and repair it. This is probably the last modification I would consider on an SOHC...
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline ampracer

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Re: 750A engine on a 550 frame? Is it possible?
« Reply #2 on: August 31, 2015, 10:53:41 PM »
650 motor would be an easier swap

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Offline chewbacca5000

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Re: 750A engine on a 550 frame? Is it possible?
« Reply #3 on: September 01, 2015, 06:26:50 AM »
I would turn that $500 auto into a wild cafe or bober.  Check out some of the youtube.com videos for hondamatic cafe

No oil tank.  Instant open triangle.  These bikes would be wildly popular with people in the city if they knew how much of a joy they are to drive in traffic.

Heck mount a big oil cooler and fan and beat you could idle all day long.
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