hi my names dan iam 18 years old and i have a 1980 rs 125 dx ive had this bike since 1 was 14 been rideing it on road legally 4 a year now and want 2 now if u now any sites were i can get enging mods. at the moment the bike has k and n air filter and bigger jets. does 81mph top same as a old rd125dx . need tips on tuning so if u can help ill be very happy . need loads off help and tip on how 2 tune it 4 top end and accelaration thank u dan.