popping back
 

after changing the ccts i am now geeting a popping back when turn the frottle of it still do 150mph but its anoying anyone else had this problem.

Sounds like you might be off a tooth on at least one of the cams.

yer retimed it today all sorted.. you think there would be hole in the frame to time it lucky a had a mirror that i could get behind the cam to see the timing mark with the aid of tipex.