My son loved his Beta 4T. We ride from 2500 ft to 13000 ft elevation. So alot of jetting is required. Carb work is a bitch on the Beta 4 stroke, besides the manifold rubber breaks alot. When he got rid of his TRRS (which he bought, since I talked him into it) and fancied a return to a 4 stroke Beta he eneded up with a Montesa 300 RR.