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Messages - zzphilzz

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CB750 / CB750 k6 pistons
« 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.

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CB750 / Valve spring orientation
« on: July 16, 2026, 10:09:56 AM »
I'm in the process of doing a top end refresh on my mates CB750 K6. On examining and stripping the cylinder head I found that the valve springs had been installed inconsistently - some tight coils up, others down. They are dual rate springs which I don't think are OEM for this model. They all have yellowish markings applied to them. I can't find any meaningful info on the net. Any advice would be appreciated. I would normally put the tighter coils valve side rather than cam side.

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