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Author Topic: Should I swap a '72 500 motor into my '74 550? Power differences?  (Read 909 times)

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Offline zoo mob

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Should I swap a '72 500 motor into my '74 550? Power differences?
« on: August 19, 2009, 09:05:36 am »
Bought a 74 550 with a broken cam chain, and have been looking for a good head and planning on splitting the cases and installing a new cam chain etc. Just came across a complete '72 500 motor with good compression etc. How much power would I lose in the swap, noticeable when riding? Just a rear mounting plate would be the only problem right, and I would have the mount that's on the 550 already.
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Andrew
 1970 750 K0
 1980 BMW R100T
 1980 GS1100E
 1993 XR650L
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Offline zoo mob

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Re: Should I swap a '72 500 motor into my '74 550? Power differences?
« Reply #1 on: August 19, 2009, 01:41:10 pm »
Anyone?
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Andrew
 1970 750 K0
 1980 BMW R100T
 1980 GS1100E
 1993 XR650L
Always looking for more

Offline d3buttz

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Re: Should I swap a '72 500 motor into my '74 550? Power differences?
« Reply #2 on: August 19, 2009, 02:20:09 pm »
i  believe the extra 50cc give you more grunt on the low end, i thats the only difference from what ive heard/read. 550 clutches were better too.
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http://forums.sohc4.net/index.php?topic=80508.0

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Offline MoTo-BunnY

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Re: Should I swap a '72 500 motor into my '74 550? Power differences?
« Reply #3 on: August 19, 2009, 02:24:34 pm »
Yeah, the CB500 crashbox is often slandered, compared to the 550  . .  it works for me though, but I dunno what I am missing probably, as I only have ridden my CB500 and a '79 CB750 DOHC, so I don't have much to compare it to.
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Offline bryanj

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Re: Should I swap a '72 500 motor into my '74 550? Power differences?
« Reply #4 on: August 19, 2009, 08:03:47 pm »
Listed power is same, clutch on 550 is better (yes the 550 mount will fit). Do it and rebuid the 550 at youre leisure
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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