Norton Service Release Database N7

SERVICE RELEASE N7

NATURE OF RELEASE: Exhaust Note MODELS AFFECTED: Commando Roadster PARTS AFFECTED: Modified megaphone silencers DISTRIBUTION: U. S. A. , Canada, Sweden EXPLANATION: We are advised of sales resistance to machines fitted with the latest reverse cone silencers with perforated tubes in the end cones due to a whistling effect over subdued exhaust note.   ACTION: Using a 13/16" diameter sheet metal rotary cutter'on an extended drill bit cut a hole through the blanking plate as shown below. This modification makes it essential to change the main jets to 210 and to drop the needle in the clip to the top (No. 1) groove. If carburation is not corrected after this silencer modification, severe damage will be caused. Observe that the resultant exhaust note still falls within legal requirements. Norton Villiers Canada Limited