Forum

[Dennis C]

Has anyone got lurking in their shed a Velocette Viper piston plus 30 or 40 in usable condition?.

I have now exhausted all the usual suppliers and have been unable to find one although one supplier was expecting new stock this month but none arrived as yet.

[Mark M]

Dennis, what is the piston number cast inside? I'm guessing these pistons are Heplex (Hepworth and Grandage)?

REgards, Mark

[Dennis C]

Hi Mark. Velocette use pistons from Hepolite, Wellworthy, and even made their own for a time, the one I have is Wellworthy and the number is 230111, the standard size is 72mm and I could use either a plus 30 or 40thou so 72.75 or 73mm gudgeon pin size is 0.822 inch.

Thanks