hi everyone, i have an issue i would like opinions on. my 77 dt250 was running good I had put clutches in,rebuilt carb and when i got it out the other day it started right up, went for a ride around block and came back to adjust air mixture. adjusted and took off in first gear and went 100 yards and it died like power was shut off. put in neutral and it started right back up, same thing take off in gear and 100 feet did it again. revs up in neutral but when on the move dies?