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Author Topic: Differences between a 74 and 77 CB550 Engine?  (Read 2210 times)

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Offline pmpski_1

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Differences between a 74 and 77 CB550 Engine?
« on: May 27, 2005, 11:06:05 AM »
I know there are differences between the carbs for these years. Any major differences for the engine?

I have a 77(or 78?) engine that I bought a while back. I'm troubleshooting oil leaks and pressure issues on my 74 CB550 at the moment. Anyway, I want to have a fresh engine but I'm not ready to start tearing down the 74 until I really know how bad it  is.

Any reasons why I shouldn't be able to swap these out after I rebuild the other?

Thanks,
Brian
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Offline TwoTired

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Re: Differences between a 74 and 77 CB550 Engine?
« Reply #1 on: May 27, 2005, 11:18:34 AM »
You should have no fitment issues.  Externally they are the same.  Intake manifolds are different. So, swap them to keep the 74 parts together.

There's only a couple of thing different internally, as well.  I believe the clutch stack is slightly different.  And, the cam cover was redesigned to hold the valve rocker shafts tight on the 77.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

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Offline pmpski_1

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Re: Differences between a 74 and 77 CB550 Engine?
« Reply #2 on: May 27, 2005, 12:25:56 PM »
sweeeet. Hell the other one may not even need to be rebuilt. Oh wait, the idea is to have a fresh motor ;)
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Online bryanj

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Re: Differences between a 74 and 77 CB550 Engine?
« Reply #3 on: May 27, 2005, 03:03:01 PM »
The only parts that CANT be switched from motor to motor are the inlet manifolds with rubbers and carbs EVERYTHING else will fit
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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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