SOHC.co.uk Forums > CB350/400

Do I clean the pistons or replace them

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McCabe-Thiele (Ted):
Did you check the compressions before taking the top end off. Looks like some surface rust on some of the rings.

I would be checking the pistons for scratches/ wear on the thrust side plus looking at the bores for any marks from standing.

I'm no fan of fitting new rings on old pistons & into existing bores.
Likewise I would not go for a rebore without checking the crank bearings.

If it was running okay aside from the oil leak you might be okay fitting them back as they are.

Eldrick:
I don't have a guage to check compression.

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