Hi all! Newbie here! I've been googling all week and this website keeps popping up so thought I'd just ask my question on here. I brought a RM250 rolling chassis and a whole box of engine which has been completley stripped down to its last nut and bolt. We've been through it and seems to have done some serious damage. Cylinder has chunks out of it and cylinder head looks like a bar of aero. I was looking at a second hand bottom end (have a new cylinder) but its a 1983 (mine is 1986) I've looked at several websites that suggest there the same but wanted to be sure. Gasket set looks the same too. Does anyone have any advice? Will it fit? Thank you! Didn't want to see a RM go to waste but parts seem to be hard to come by!