Most likely you are hearing piston slap. Probably time for a new top end.
.5 L
stock gearing 60 mph
the ktm 85sx. it beats all of the others
In 07, the KTM 85SX MSRP was $4,298.
with stock gearing 60mph
32:1.
5.1 on my 2004 model
400cc 5wt fork oil
YES
About 5,000 new but around 2,000 if you find a pretty used one
fill it with oil full, 170 psi nitrogen. dont mess it up.
i have a ktm 85sx and a kx 85 small wheel. i am a midgit but i can ride them. i am twelve. this should help. a kx 85 big wheel is an awesome bike. although if he or she is small it will be too big. a ktm big wheel is expensive but is worth it. it is still quiet big. these are some seat heights kx 85 = 840mm ktm 85 sx = 850mm rm 85L = 850mm cr 85 = 860mm yz 85 = 840mm but all these are ajustable my bros 14 and he rides a ktm 85sx big wheel. he is 170cm tall.