For high speeds adjust the auxiliary air valve.
(Owners should learn the make-up of their carburetor before attempting to adjust it, and should first watch someone who knows how to do it.)
TO ADJUST CAM SHAFTS WHICH TIME VALVE OPENING AND CLOSING
Make sure that push-rod adjustment is right—that a thin card will pass between push rod and valve stem when valve is closed.
Determine direction of rotation of cam shafts.
Set fly wheel so that the mark 1 T. C. (top center) registers with pointer.
Turn fly wheel until mark 10° P. T. C. (past top center) registers with pointer.
Rotate exhaust cam shaft in proper direction until the exhaust valve of No. 1 cylinder has just closed.
Rotate inlet cam shaft until inlet valve of No. 1 cylinder is just about to open.
Mesh the gears and lock them in place.