SOHC.co.uk Forums > CB750

dont let this happen

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hairygit:
Sadly at least 1 bent valve is a certainty :( maybe more as the cam may have still moved at odd times due to the fact of the way it broke, leaving a rough edge which could occasionally move the cam a fraction and let other valves hit the pistons :'( One thing I will suggest though, when you have rebuilt the engine, as it's in a chop frame, leave the rocker cover off and leave the spark plugs out and wind it over on the starter  several times to make certain that oil is reaching the top end as it should, then fit the rocker cover and spark plugs! (something we have to do OUT of the frame on a standard bike :() 

Bryanj:
Used to see this semi regularly in the past when a person not used to Honda's would re-build an engine and not be carefull enough to claen out bits of gasket or use excess silicone.

Also 20/50 is too thick in the UK

davepainter:

Here is the cam and carrier-i hope it shows pic? i bought on e-bay from the states

SteveD CB500K0:
Love the way they get "Sandcast" into every CB750 listing...

Hinomaru:
CB750K cam cap bolts do work loose and this has happened way too many times, even with stock engines. This problem becomes worse when running aftermarket valve springs and cams. One solution is a modified cam cover which adds extra support to the cam caps to prevent them from coming loose and dropping oil pressure. Old modification from the 1970

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