Norton Service Release Database N47

SERVICE RELEASE N47

NATURE OF RELEASE: Muffler replacement MODELS AFFECTED: Commando 1970- Roadster DISTRIBUTION: Worldwide exept Australia (for general distribution) EXPLANATION: We are no longer able to supply the 1970 type muffler 061608. With immediate effect orders for this type will be met by part number 061978. The latest silencer 061978 requires a 220 main jet whereas earlier types used variously 220, 180 then 210 main jets.   ACTION: When replacing an unserviceable muffler of the megaphone type with the later type, check the carburetor main jet size on the effected cylinder. Since it is bad practice (though physically possible) to use two mufflers of differing internal characteristics with different jet sizes on one motorcycle, it is strongly recommended that the mufflers are replaced as a pair, and the jet sizes adjusted accordingly. June 1971 Norton Villier Canada Limited