just changing the fork oil made a hell of a difference to mine mine has the older paoli forks
boyesen reeds have made mine more responsive and rev crisper
the modified rear suspension plates have made the rear feel better but not ridden the bike since fitting them only done on monday
this might sound daft and i dont mean to insult you but when i was 16 i had a puch m50 gp a quick little bike and to save money i packed the baffle with wire wool it ran great till i got it hot then exactly as you describe loads of smoke and sparks
