Topic: cb750 63mm head gasket

[D DIAMOND]

hi have got cb750 with 63mm pistons the standard head gasket is catching at top of stroke would a 65mm big bore gasket be ok to fit
thaks DD

[PeWe]

Bore size really 63mm?
If you measure pistons at top, you'll get smaller number.

Measure bore that might be 64-65mm

Head gasket 65mm.
Size under is 62mm, next step over is 67 or 67.5mm.

[D DIAMOND]

hi the actual pistons are 30mm over size, the gasket i bought looks to be to small when each piston is nearly at TDC it catches the gasket

[Nurse Julie]

hi the actual pistons are 30mm over size, the gasket i bought looks to be to small when each piston is nearly at TDC it catches the gasket

30mm oversize, wow, I'd like to see how that works 😬🤔🤔🤔🤔Do you mean 3mm?

[Jerry Rxman Griffin aka MuthaF'er]

812 kit