Hey dude i have a complete 1987 model cr500 that i have recently gone through the hole motor it has a new cylinder on it bored .20 thousandths new rod rod bearings both crank bearings new seals runs very very strong if interested in it let me know.
TAke your bowl off on that side and grind the nut head down i did the same thing to mind works perfect but dont grind it to much just enough to clear the clutch arm.