Yes will fit straight on but you will have to jet up to rd spec and you will loose all bottom end power, could never understand why nobody put a dt 10v topend on an rd back in the day as i was getting 87mph out of a 10v std bike with rd 16t front spkt back in the day and you were dancing on the gearbox all day with an rd 125lc to keep a decent speed ,i have 3 black 3 blue and 2 white 10v/12w,s up here, incedently i also put a 17t front sprkt from an rd125lc on the front of my kmx200 back in the late 80s as nobody did one for the kmx at the time fitted straight on and would pull 100mph sitting up, highly recommended bikes just need a better front brake as do 10v,s i swear mine used to speed up when i put the front brake on !
Was using it for a 10V DT12 5LC175 blaster piston conversion I’ll need a 28 min mikuni carburettor. Some oil pump adjustment and a good old Rolling Road. Do you think I would be better off with a 10V barrel then? Many thanks in advance. Pete