With Vee Two performance Cams, we endeavour to run 0 clearance through the opening and closing cycle to prolong closing shim collet and valve groove life. However it is important that binding does not occur. Due to errors and differences in rocker radii pin positions, etc, a slightly wider tappet clearance than specified may be necessary. Vee Two recommends that piston to valve clearance always be checked.
When checking timing in Desmo engines, not using closing springs, ensure that the bottom rocker is held up against closing shim at position of taking cam timing figures.
3. Please check rotation of camshaft in cylinder head before assembly. Some early single heads may require the removal of a small amount of the head material from the inside of the rocker box to allow clearance for the extra lift from this camshaft. This work can be performed by any competent motorcycle mechanic.
Opening and Closing Figures at 0.5mm Lift
Inlet Opening 54 degrees B.T.D.C
Inlet Closing 71 degrees A.B.D.C
Exhaust Opening 85 degrees B.B.D.C
Exhaust Closing 38 degrees A.T.D.C
Maximum Lift at Valve