the plastics changed in 93 , so 93-95 rm plastic rad shrouds, frenders should all interchange
i had a 92 rm250 i would have been happier with the rmx, nice bike, a good set of reeds,jet it right and it should be a great bike, let alone if you have it ported
there is no oil pump (hehehe) ;)
i like klotz 40:1 just keep a eye on the plug to make sure its not to bright of a tan /or white color, the pre mix oil lubricates the main bearings as well as the cylinder
93-99 motors were compatible i believe, try a 1-800 number
to get ahold of a suzuk factory theyll help on the numbers