SOHC.co.uk Forums > CB750

Head Bolts

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SteveW:
Don’t know if this is relevant but I recently rebuilt the top end of my 1980 650 engine.
I found that the replacement head gasket was 0.1 mm thicker than the original and the new o-rings for the oil feed to the cam were 0.4mm thinner than original.
So a total of half a mm under size.
I wasn’t going to risk it leaking so I sourced some o-rings half a mm over size and no leaks at all in 200 or so miles.
The gasket set was NE brand from David Silvers.

McCabe-Thiele (Ted):
My 400 engine rebuild including a rebore came out at around £1200 for parts that included new threads for the cam chain tensioner bracket - shells big end.mains, both chains, primary drive bearings, drive rubbers plus some gearbox parts. Rebore by Trigger. Gaskets etc.

Laverdaroo:
If you’re that worried, just take the top off and see if there’s damage and or check for warm on an engineers plate or a bit of glass
These motors aren’t that complicated, especially after working on ducatis and other European temperamental lumps. The crowd on here have your back and you shouldn’t have a worry doing it. If you can work on a trumpet you’ll breeze the 750 motor. It’s not one big job, it’s just a selection of little jobs. Easily said but keep telling yerself that and the nerves will go. Go for it, it’s really satisfying. Don’t forget though it’s a 40 odd year old bike, they can’t run brilliantly all the time, you’re the new custodian, make it how you want it and don’t be scared or apprehensive about it, it’s not as hard as you think. Just follow the process and you’ll be away


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Bryanj:
Is the manual you have Haynes, Clymer or genuine Honda?

Martin6:
Honda (downloaded) and Haynes.

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