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Author Topic: CB550 Top end rebuild  (Read 649 times)

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Offline crantonr

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CB550 Top end rebuild
« on: May 09, 2020, 08:50:17 AM »
Hi All,

In the process of stripping back the top end of my K3 CB550. Not going too badly until I encountered a bent inlet valve on #1 cyl which probably explains the power loss problems I was getting. Will the guide need replacing as well or might it still be OK? Also I noticed that some of the large valve springs had 2x shims under them. Is this to compensate for weak springs or do you think the PO couldn't count?

Richard
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Offline bryanj

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Re: CB550 Top end rebuild
« Reply #1 on: May 09, 2020, 12:42:34 PM »
I think the PO was a moron, there is a warning on how to fit the cam cover without bending valves in the manual and excess shims is just carelessness!
Insect the guide carefully for cracks/breaks and see what play there is with new valve
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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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Offline calj737

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Re: CB550 Top end rebuild
« Reply #2 on: May 09, 2020, 02:43:48 PM »
Replacing a valve alone does not require a new guide. If you replace the guide, you must recut the seat.
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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 crantonr

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Re: CB550 Top end rebuild
« Reply #3 on: May 09, 2020, 11:43:44 PM »
OK thanks guys
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