Hey, this is my first post. I did a search on this but couldn't find a straight answer. Is there any other mill that will fit in my 85 XR200R frame? Perhaps a 250? I have been through 3 top-ends and am sick of dropping valves and stripping head bolts. So what are my options? What bolts up? I know most people will say to get a new bike, but I am rather attached to this one. Currently, she runs but burns more oil than gas- my buddies call her "smoke screen" because riding behind me is suicidal. But I love the thing. Thanks.