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SOHC.co.uk Forums => CB750 => Topic started by: zzphilzz on July 16, 2026, 06:19:35 PM

Title: CB750 k6 pistons
Post by: zzphilzz on July 16, 2026, 06:19:35 PM

Hi, has anyone any experience of the 392 type IMD pistons when installed in a 300 type cylinder block? Slightly higher compression and supposedly ok in UK supplied bikes.

Title: Re: CB750 k6 pistons
Post by: Skoti on July 16, 2026, 07:44:40 PM

Yes,

but not exactly addressing your question.
 

I bought a low mileage cylinder block with 300 type pistons from the USA, which replaced the 392 higher compression pistons and rust damaged cylinder block on my UK F1.

Every thing fitted OK and performance seemed similar.


Hope this helps.