thanks ,really appreciated I checked the r.c valve and it turned out not to be working at all so I had all to bits and it turned out it wasnt properly plugged, now it flies, though I lined the marks up again went for a ride turned it off and the marks were out of line

ive just bought a 1989 crm 250R it runs great and is in very good condition, but its seems restricted or something. It gets to 70mph and that is it won't go now more but the engine doesnt sound like its over revving at all. It doesn't seem to hit a powerband either though Ive checked the r.c vavle ...