I have an 06' 400s, yosh pipe, 3x3 mod, and 14/44 gearing. Its exactly the same setup as klx400riders 03' klx except for the pipe, he has a T4. Our jetting is the same but his bike will top out at about 100Mph, mine seems to run out of power at about 84Mph. when we line up were dead even until we hit third then he walks me hard. Any help would be appreciated! Thanks.