Reinforced Gearbox Shell - The Norton/AMC gearbox shell was designed for 500cc 30HP engines, not 70HP 850"s. While adequate for normal riding it is easy to break in competition or serious street riding. We now offer a heavy-duty aftermarket replacement shell for the pre MK3 models. Currently available on special order only - #N299. The upgraded factory version is normally in stock.

Dual Anchor Gearbox Mount - This is the item we advocate for use when fitting a belt drive to make belt adjustment easier. However, the practice of using dual adjusters has been around a lot longer than belt drives and it was a common modification to Norton racing twins in the 60’s to keep the gearbox from moving about under power. We offer two kits to add a second anchor/adjusting screw. Both are made from stainless steel and require removal of inner primary cover and the drilling of the drive side engine plate to install them. Complete stainless conversion as illustrated. - #N302 $89.00

Dual Anchor Gearbox Mount  

Norton / AMC 4 Speed Close Ratio Conversion  

Norton / AMC 4 Speed Close Ratio Conversion - Five speed conversions have been popular with racers since the 60's, but they are both expensive and a bit fragile when used with 750/850 engines. This less well-known 4-speed CR conversion offers a improvement in gearing at 1/3 the cost and maintains the reliability of full width gears. Gear set stocked allows use of the kickstart and is suitable for street or track use. A non-kickstart version is also available. Ratios are 1:1, 1.15:1, 1.4:1, 2.05:1 (1.8:1 without kickstart). This item is available on special order only - Email for current price - #N301

Commando Pivoting Kickstart Lever - Designed by RGM in the UK,  it is intended to provide better exhaust pipe clearance than the factory lever and also reduce the interference with your leg that is common with the stock setup. Fits all AMC gearboxes but is not compatible with our rearsets. #N310 - $219.00  

Dommie/Atlas Kickstart Lever - The factory has recently introduced a new kickstart lever to fit the Dommie, Atlas and most Matchless models with an AMC gearbox. We offer both the factory item and a lower cost aftermarket version. #04-0434 (see Factory Parts - Norton PDF for current price)

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