SOHC.co.uk Forums > CB750

Would you use these piston rings?

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leadnavel:
Hi guys your help would be appreciated with this dilemma. I'm continuing with my first 750 K7 engine rebuild, 32 yrs after removing the engine from the frame. The engine has been sitting without oil in it for all this time but I have been sticking some oil into any open engine holes over this period and hand cranking it to keep things moving. I'm in the process of stripping and cleaning the oily rust from the exposed surfaces and am unsure if would be OK to use the old piston rings as they have various markings on them, are these markings/stains normal. Although they look iffy all the rings feel smooth to the touch! What do you guys think?

JamesH:
False economy in my opinion...just source new ones...you'll always have a nagging doubt otherwise...

Trigger:
The piston to bore clearance needs to be tight on these old girls and as James stated, only muppets use old rings. You need to check that the bores are within spec and if they are, then they will need a light cross hatch and new rings, to insure that the engine will not burn oil  ;)

hairygit:
And a set of rings isn't much more than a decent top end gasket set, which you would have to buy in the near future if you used the old ones!

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leadnavel:
Thanks for the information chaps, sounds like it would be a wise move to get myself a full set of rings to be on the safe side. I’ve miked and measured most of the other gubbins in the top end and all appears (surprisingly after all this time) to be within spec and in good nick, after a good clean. I haven’t got a bore gauge so next stop local mech to have the bores measured and  cross hatched if needed. Much appreciated your wisdom is!


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