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how to clean valves properly

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AshimotoK0:

--- Quote from: McCabe-Thiele (Ted) on January 09, 2022, 11:37:09 PM ---FWIW except when I have had to have new valve guides on car cylinder heads  I have found most valves will seat ok by just going throught the two grades of grinding paste. Coarse to remove the worst bits then fine for the final seating. It's tedious but I've always managed to get the surfaces back to where they should be. Professional engine r-ebuilders often re-face the seats as it's more cost effective but if your labour is free then its worth a shot.

It's time consuming but unless you have serious pock marks on the seating face they usually clean up okay. Your fist grind with coarse paste will usually reveal if the pock marks are too deep so need re-facing.

--- End quote ---

Ideally though on Honda's Ted,  there is quite a tight spec. on the seat width..so that should be watched out for.

RBoss:
Thanks all for the advice!

I think I will starts soaking the valves in thinner or similar, clean them with scotchbrite and proceed with both the valve lapping pastes in the lapping procedure. Like you say Ted, I don’t mind spending time on a tedious job. That’s the reason I am in rebuilding this amazing bike anyway  ;D

Thanks,
Ruben

Seamus:
There is a tool for lapping valves. Fits in a battery drill and it oscillates the valve. Saves loads of time and sore palms.
Had mine for about 35 years and still going strong. They have something similar on Amazon for about 20 quid

deltarider:
Hope someone can teach me on this. Is it true that some valves are special and are not supposed to be lapped and if you do, you will do more harm than good? Second question: what is it precisely, that causes valves to wear?

RBoss:

--- Quote from: deltarider on January 10, 2022, 10:29:49 AM ---Hope someone can teach me on this. Is it true that some valves are special and are not supposed to be lapped and if you do, you will do more harm than good? Second question: what is it precisely, that causes valves to wear?

--- End quote ---

Additional question to this, what would make the valves special (do I have them?  ::) )

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