Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: Johny Boy on March 09, 2026, 09:21:36 PM
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Hi everyone, well my engine rebuild is almost done cb550
However, when I try to refit the rocker cover assembly the rocker casting is touching the valve head before the cover casting bottoms on the head in 2 positions, this is with the adjustment screw fully wound out.
I had the head skimmed,valve seats machined and new valves fitted.
Has anyone come across this before?
Any advice would be very welcome
John
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Nope but cutting the seats may have let the valves come too far up, try fitting the cover with no cam fitted and see what touches
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There are always some valves that are down on tdc.
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There are always some valves that are down on tdc.
Good point Ken, I guess Johny could rotate the engine and see if the high point moves to different valves or simply fit the top cover, adjust the valve clearances with a somewhat wider gap (not running the engine) to put his mind at rest on the valve seat cutting. If all valves close okay, set the correct gap and re-check.
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Thanks for this, I did not know that some valves would be open at TDC. Key point.....
Checking against the Haynes manual, the valves which are contacting are #2 exhaust and #3 inlet
If I'm reading this correctly then I have #4 on tdc on compression.
Thank you all so much, this now makes sense
I will bolt her down in the morning and let you know how I get on
Ýou guys are awesome
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Thanks again all, all sorted now, although setting the valve clearance is a pain!
Right angled slip gauges would be handy!!
Ride safe
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You can buy right angled feeler gauges as it happens.
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Fleebay