I didn't want to start a new thred so does anyone know if there are any companies still making 91mm(or close) stroke cranks.
I rang Farndon and they will do a custom one from billet for around 1000 Pounds, and Brickworx said they had one in the making ages ago but I'm unsure if it went anywhere.

I was given a pile of 2nd hand old sh!tty std triumph 2500 pistons years ago from ted Davis (One of The old Triumph Gurus up here in Brisbane) i think i have about 10x of them,,, they`re pretty yukky looking but i cleaned up the best looking 4x of them & they`re in my 1500 donk,,, so,,, yeah i have some spares but you won`t like the look of them

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

3 of mine are pitted, which i can deal with...but one is out of round, which i guess is less than ideal

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speed costs....how fast do you want to go...