Thanks muskrat,ive sourced all of the engine bar the engine cases,i have them from another source,the cylinders +0.40,the guy says they can be bored to +0.70 is that correct?,im getting 0.50 low compr pistons(new set with gudgeons and rings )with the engine,a mag and a genny.Hopefully all the shims and bits and bobs.From memory,the later swingarm gearbox internals fit the plunger box,correct?are the mainshafts the same?i recall some with a taper and keyway,some with a spline,my momories a bit rusty after 40 years.I need lots of bits for this one,battery box,mudguard stays on the rear,mudguards,front 8 inch wheel hub, plus small bits.Great old bikes,i restored one back in the 80s and did many,many miles on her,regards Graeme in New Zealand