Ok well im new to the forum and need some help. Top torn down an piston currently at 68.50 so cylinder scarring so gonna hone and get A 69mm .80 over. Ive been getting conflicting info so... 85-86 same motors 87 bastard year start of powervalve 88-92 motors the same. I have tried to find out if there is a difference in the sleeve and piston of the 87 an 88-92 years that makes them incompatible? Is it not possible to just run it? What is safest over bore for the 87 lt250r. NEED HELP THANKS