Cagiva super city 125 waz perfect now not reving in gear over 6000 rpm use to go at 13000rpm in power band mode now gone flat . sounds like exhaust is blocked been perfect last 3 months .i use castrol 2 stroke motor oil good stuff and dont even abues my bike. bike use to do 85 mph no swat now wont go over 40 struggles please help

Motorcycles - Cagiva - Supercity 125 - 1993 Cagiva Supercity 125