SOHC.co.uk Forums > CB500/550

how to clean valves properly

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RBoss:
So I have been busy with the sucker method... And I agree Oddjob, its pretty frustrating when the suction cup starts getting loose all the time, I will switch to the tap wrench soon, if I am not there yet.

However I am getting pretty good results already and I am just wondering what you all would do. Here's the situation:

I have been lapping with coarse compound and was able to get the biggest pock marks off the valves. The pock marks that I am having trouble with getting of are these ones (in the picture).

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Would you either:

1. go on lapping until these pock marks get off and the surface is smooth (I don't know how long that will take) and what the maximum is one should keep lapping valves.

2. do a test with water or gasoline in the valve area and see if it leaks--> when it doesn't leak, leave it like this

3. leave it like this --> it doesn't make that much of a difference

4. buy a new replacement valve as this has relative impact on engine performance

I'm wondering what you guys would do!

Oddjob:
Do the petrol test. See how that goes.

I'd keep on lapping for a while yet but that's just me.

Nurse Julie:
If you have that much pitting on the valve faces, the valve seats will also be pitted If you keep grinding you run the risk of stepping the valve face. This thread explains what needs doing.  http://www.sohc.co.uk/index.php/topic,20419.150.html

RBoss:

--- Quote from: Nurse Julie on January 13, 2022, 01:44:28 PM ---If you have that much pitting on the valve faces, the valve seats will also be pitted If you keep grinding you run the risk of stepping the valve face. This thread explains what needs doing.  http://www.sohc.co.uk/index.php/topic,20419.150.html

--- End quote ---

That looks like a top end quality rebuild! :o

I'm trying to avoid cutting corners on my rebuild, but I believe I am not at that point yet.

I think the valve seats look pretty good. (apologies for the poor photo quality)

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I'll start with the petrol test and probably go on lapping for a bit.

Thanks for the advice!

Oddjob:
No 1 looks the worst. Even that ain't too bad.

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