Bridgestone 350 gtr and gto springs.
If you are undertaking a engine rebuild number one replace kick start return spring( these are always weak,) part number 2636-9000.
Next is the kick start ratchet spring for very little cost i always replace part number 2634-8000 x1.
Change shaft return spring i have seen these snap, every time you change gear this spring is working, part number 2551-5000 x1.
Drum shifter ratchet springs and again very little cost and its the same part number as the kick start ratchet 2634-8000 x2.
Drum stopper spring a more positive neutral position, part number 2538-9000 x1 plus the gasket part number2561-9000 x1.
These parts are inexpensive but can make a big difference in the way you change gear and put into neutral etc.
Richard has most of these parts in stock.
Thanks.
Steve.