Originally Posted by kawirider

my 13.5 does the same thing. dont worry about it. it seems to do it more when there is alot timing in the speedo. i have a spx i run with a 13.5 and i have it turned up to 8 but with lower static timing in the endbell of the motor. just run it and check temp often to make sure you are not overheatin the motor. if you really want that stock motor to rip get a tekin RS. fastest speedo i have ever had period!