Norton Service Release Database N81

SERVICE RELEASE N81

NATURE OF RELEASE: Disc brake wheel spokes MODELS AFFECTED: 1972 Commando with disc break DISTRIBUTION: Worldwide (Trade only) EXPLANATION: The spoking arrangement of the disc brake type of front wheel requires periodic attention to correct possible loss of spoke tension. To eliminate the need for regular attention, the following technique which is now applied to all disc brake wheels at the factory should be undertaken at the earliest opportunity (prior to delivery where possible): 1) With all spokes lightly tensioned, tighten left hand side inboard spokes. 2) Tighten left hand side outboard spokes. 3) As shown in the illustration below, set the left hand side inboard spokes straight (shaded heavily) by tapping the bowed portion of the spokes with a 1/2lb. (. 225Kg) hammer and drift 3" (76. 2mm) from the centre of the spoke head. 4) Retighten the left hand side inboard spokes. 5) Tighten the right hand side inboard spokes. 6) Tighten the right hand side outboard spokes. 7) Recheck wheel for truth and align as necessary. Realignment of the left side inboard spokes asdirected will tension the wheels and minimise spoke deflection, making further periodic checking of tension unnecessary.   March 1971 Norton Villier Canada Limited