SOHC.co.uk Forums > CB350/400

Do I clean the pistons or replace them

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Alexrayz:
If it ain’t broken don’t fix it.

I’d be interested in what the numbers mean but it is not necessarily a piston order.
Maybe it is the stamp for the mold reference, so that in case of a manufacturing defect you can easily spot the faulty mold. You can see that on many cast products.

Not saying that is the explanation but it could be one.

Either way if your bike ran fine don’t bother. Feel free to check their specs are within tolerances but yeah other than that refer to the first sentence of this message hehe.

Motorcycle maintenance can be tricky and stress inducing and we always assume the worst very quickly, but if there is an issue the bike will make it loud and clear.

Trust your senses and your smarts and keep cool!


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McCabe-Thiele (Ted):
Can't believe they were numbered by Honda in assembly, most likely a casting batch number.

Although my experience is mainly automotive never seen pistons numbered during factory production.

Eldrick:
Here they are, I presumed the number was a correlation to the piston barrel number.

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Whilst I am talking about those, how do I know if the rings need replaced?

Alexrayz:
The rings are here to separate the combustion chamber and the oil lubricating the piston. Busted rings would result in oil burning in the chamber, which is signalled by a blue smoke at the exhaust and the oil level dropping over time. Other result is a loss in power as the compression goes into the crank (seal of the rings gone).
As the lubrification is compromised the pistons can end up grinding against the piston sleeves, so vertical grind lines on the sleeve can indicate poor lubrification and so busted rings.
 Also if your rings are broken well then clearly they need to be changed.

If you haven’t noticed anything then no need to undertake changing your rings.  Again if you want to check that all is well you can refer to the shop manual where you’ll find the ring’s tolerances and check that out


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Bryanj:
Those are not bore numbers but probably mold numbers to identify any production problems

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