today i was riding my CR 250 and it was running great for hours. Then all of the sudden it started making a weird kind of grinding and clinging noise. It sounded like it was coming from the cylinder. i was worried that it was about to seize up. So then it stalled out and wont start up again. its not seized because i can still kick it over but it doesnt even come close to starting. I know its not the plug or anything because i checked that. Could it just need new piston rings or something like that? Thanks for any help.

 

I don't know, it could be the rings.

Try posting at dirtrider.net they will for sure help you out.