SOHC.co.uk Forums > CB350/400

Do I clean the pistons or replace them

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Eldrick:
During my gasket chage I noticed my pistons are black, see this image.
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Do I need to replace these pistons?

McCabe-Thiele (Ted):
They are running rich as you will know from the colour - if you had good compression & the bores look good with no step at the top I would just clean them.

Laverda Dave:
I agree with Ted. I personally would remove the pistons from the rods to a) clean the pistons of the carbon and b) to make life a lot easier when removing the base gasket and cleaning up the joint face. Get some clean rags down those openings before you do anything else, there's a lot of dirt and grit around there.
You'll need four new piston circlips when replacing the pistons on the rods (you only need to extract the circlip from once side when removing them).

Alexrayz:
No need to replace it is just carbon build up. Giving them a clean is enough, as it has been mentioned before.

Are you running your engine at a low RPM usually? Something like bellow 3000?

I have been told that those deposits form when the combustion chamber temperature is slightly too low, that is when the engine is run at low rpm, whereas at higher rpm the deposits burn off, keeping the piston heads clean.

Something something italian tuneup


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Eldrick:
My pistons are factory stamped with a number and instead of 1-2-3-4 they are 2-3-4-2. Since the bike was running just last week, should I be bothered that a 'PO' has used non-sequential pistons?

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