The Norton 650SS

For a short time, the Norton 650SS was the company's top dog until the Norton Atlas arrived. Today it's a rare classic.

| January/February 2007

If seven was the magic number of the ancients, in my formative motorcycle years it was 650, as in 650cc. But with a budget that could support nothing better than a castoff moped or a terminally asthmatic scooter, England’s glorious 650s seemed like the chariots of the gods, all of which have become classic British motorcycles.

In my youth in England, a 650 was the biggest, most powerful British motorcycle you could buy: BSA’s Golden Flash, Triumph’s Thunderbird, Royal Enfield’s Super Meteor (an overachiever at 692cc) — these were the “big inch” bikes of the day. So I could never understand why Norton didn’t build one — until 1960, anyway. And why, when 650 Norton motorcycles were finally available, that the company already had a 750 waiting in the wings.

Norton did get a touring 650 in 1961, but only for export to the U.S. market, where it was sold as the “Manxman.” Finally, in 1962 the Norton 650SS arrived and was an instant hit. It seemed to be the bike every Norton twin should have been.

But the Norton 650SS was top dog for scant seconds. In the same year, AMC-Norton introduced the 745cc Norton Atlas, a big bore version of the 650 intended to boost U.S. sales. As a result, few Norton 650s made it across the pond, the majority being sold in the “home” market.

The Norton 650SS was essentially a stroked version of the model 99SS, with dimensions of 68mm x 89mm (the 99’s stroke had been 82mm). Like the top Dominator, the 650SS breathed through twin Amal Monoblocs, but with the intakes now angled downwards. Twin exhausts replaced the 99SS “siamesed” system, and the headlight nacelle was dropped in favor of matched speedometer and tachometer. Finish went from the 99SS two-tone color scheme to a classic black frame, silver painted tank and (optional) chrome fenders. Though simple in concept, the overall effect was stunning. The black, silver, polished alloy and chrome finish created “the look” for sports motorcycles for a decade — until the metalflake Seventies.

Sadly, though, the Norton Atlas always overshadowed the 650SS. After all, cubes are cubes, and the Atlas simply had more. The 650SS was last produced in 1967 — a year after AMC went bust and was acquired by Dennis Poore’s Manganese-Bronze empire — though a single carburetor version, the Mercury, continued until 1969.

4/16/2014 7:37:29 PM

Good article. I have a barn fresh 1966 650ss I just picked up that needs a lot, but will get it, I pledge it! Curious about that Boyer electronic conversion. Not heard about a swap for the old mag before.... Mags are great when they are on, but misery when they are not. As with my coil Triumphs , I would scramble over to an e ignition if I knew how to make it happen. Any suggestions would be super.

Benjamin Gradler
2/25/2014 8:29:16 AM

Yes, Calling the USA spec 650 Manxman a touring bike is a misnomer as mechanically it was identical to the later 650ss, the only difference was in the exhaust system and a few superficial cycle parts. In fact about the first 650ss bikes were exported to the USA also and the first 50 of those had the same paint and cycle parts as the Manxman but not it's exhaust. Norton's marketing department probably chose what numbers to use for advertised horsepower for both bikes, so obsessing with them is for idiots. Also for the record, the first Atlas bikes were built during 1962 BEFORE the move to the AMC works at the same time 650ss bikes were being assembled. The 650ss and other Dominators kept the speedometer in their headlight AFTER the move to the AMC works, through 1964 at least for U.K. market bikes, USA spec bikes started to get the twin instruments on a separate bracket for 1964 in most cases. The Atlas did not immediately overshadow the 650ss. The early Atlas was a single carb, low compression touring bike with less performance than the 650ss. Even the later Atlas with twin carbs still had a point and a half less compression and more vibration than the 650ss. Real Norton enthusiasts always went with the 650ss over the Atlas as the two were kept in the Norton lineup together until the Commando came out in 1968. The Atlas overshadowed the 650ss only in sales, not as a legend, and then only because USA importer Berliner concentrated on the 750 as a marketing point to increase sales and profits. In the meantime Berliner's head Norton technician during the 60s Heinz Kegler, raced and was a fan of the 500-650cc Dominators, holding them in esteem over the Atlas and far above the Commando, which he described as a three-legged Camel...

Anna Jeannette Dixon
8/19/2013 8:12:13 AM

well the first 650 to be built was on the 7th of November 1960 , these were the Manxman model built until the end of august early September, this is when the Cheaper 650ss came in , but The Norton Manxman was a Better Bike to the 650SS and more colorful and had more chrome that the 650ss had on it and the Manxman Had more Power 52 bhp than the 650SS at 49bhp . so the British got less of the motorcycle than the USA ones and the 99SS was made with part from the 650 Manxman , the 99SS wore the manxman crankcases and camshaft and cam followers and push rods , and the paint job was two tone Grey dove Grey and polychromatic grey and two tone seat cover light grey and dark grey at the bottom half , I run the Norton Manxman register. and own a Norton manxman built early December 1960 , and rides like a dream , a very comfortable machine to ride and own Yours Anna J Dixon

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