Take a tooth out of the front sprocket first before you sink your money into a pipe. ;) If thats not enough try the boyeseen dual stage reed ;) and finally the pipe.
I did the above and the most noticable was the sprocket change out :p
Probably the best would be to let Mr. Goor work his magic on the top end :cool: and by far the cheapest..... :D
you could get a good pipe and muffler for and then to really get the bike going look into the Wolf CDI for the YZ 85's ,, all the top Euro riders are using them in the school boy class and love them.
You can contact Tom Morgan Racing for more info,,,