I bought a 2005 TRX 450R brand new and still runs great !! and run it hard 2 top ends is the only thing ive done to it ! Its ported with bigger cam +1 valves CP piston exhaust
Ive got the same quad since I bought it new in 05 Ive never had a issue with the clutch ! Whats it doing ? is ur cable working right or out of adjustment ? pull the cover off and youll be able to see if it working proper