norton jubilee advance retard springs

Expensive answer but go 12V and fit electronic ignition. Make it a better bike.

AO

I'm one pistonmissing from afull set forthe Rolls Royce Griffon in my Mk X1X Spitfire. It might be a bit expensive, but should I get rid of pistons all together and fit a RR Olympus in a bid to make it a better plane.

Sqn Ldr

There is a chap called the distributor doctor who can probably help you. He keeps a large stock of springs.His telephone number is 01984629540.