yes clive its 450 cc or mls. just under half a litre. this was up until about 2016 when the new bikes then came with the new diafram clutch. those new bikes take 650 cc s. hope this helps mate.
fred adams in gloucestershire is your man. brilliant with montesas. used to work for b.v.m but now is freelance. firm is called g.l. motorcycle tech. sorry cant find his number but b.v.m would have it. hope this helps.
hiya phil. gwent classic club runs trials in the gwent area. great bunch of very enthusiastic guys that run it. not to far from where you are hopefully. 1st trial is on 12th march i believe. its near llangorse lake area near brecon. come and meet us all. one of the comittee even has a nice b.s.a. for sale at the right price. cheers garry.
the kit with the new spring and bracket should come with a different bolt as well . remove the little bolt and replace it with the one in the kit different shape to it. side stand then works as normal.