i just bought a '85 rfvc xr200r for $150 thought i got a good deal until i tryed to find the parts i need (crank,main berring), found out i bought a lemon instead, is there a engine that is swapable or close enough that only minor mods are needed? im pretty good with a welder and doing minor fabrication but im not the best, what engine will bolt up or come close, any 1 have a rfvc parts engine for sale other wise.