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Bike Review - Posted 14th March 2014
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AJS Model 18 / Matchless G80
500cc Single Buying Guide

If you're looking for a traditional British single-cylinder classic motorcycle, then the AMC 500s are charming old chuffers which happen to be excellent value...

Honest, dependable and free of phoney pretensions, the big singles built by Associated Motor Cycles after WW2 neatly balance price and performance. The 497cc AJS Model 18 and the Matchless G80 were revealed in late 1945 and stayed largely unchanged for the following three years. The 82.5mm bore by 93mm long-stroke motor gave 497cc and ran at 6:1 compression using the traditional British pushrod-operated overhead valves, dry sump lubrication with an external oil tank, and a four-speed separate Burman gearbox. A manually-operated magneto and 6-volt chain-driven dynamo, both by Lucas, provided sparks and lighting. All in all, as their specification suggests, the AMC singles were extremely English…

AJS Model 18 / Matchless G80 500cc Single Buying Guide 1948 AJS Model 18 Advertisement

The singles' trials heritage (ably demonstrated by Martin Peacock's G80CS seen below) bred near-perfect poise so, although seldom adopted by the caff racer crowd, AMC singles were ideal for weekend mud-pluggers. Similarly, they make splendid mounts for B-road riders today… providing you don't want to travel much faster than 70mph. They're jolly happy at 55mph to 65mph.

AJS Model 18 / Matchless G80 500cc Single Buying Guide There's a full feature on Martin Peacock's Matchless G80CS, aka The Westerner, in the March 2014 issue of the monthly RealClassic magazine

Early iron head models are low, light and characterful, combining a sprung saddle and rigid rear end with useful Teledraulic front end. AMC's front forks aren't as famous as Norton's Roadholders but they're surprisingly advanced for their time and provide a predictable balance of confident, precise steering and impact-absorbing hydraulic damping. The 7-inch front brake on the post-war machines is considerably less effective than the forks: it's adequate but you'll need to employ the rear stopper in most circumstances.

AJS Model 18 / Matchless G80 500cc Single Buying Guide 1956 Matchless G80 brochure

Over the years the AMC 500s singles turn a touch puddingy with the transition from trials tools into all-round roadsters, but they gain proper swinging arm suspension with skinny 'candlestick' shock absorbers and a more relaxed ride in 1949.

Then come hairpin valve springs (1949); a light-alloy cylinder head and the chunky Jampot rear shocks for which the marque is well-known (1951); engine developments and a larger carb in 1954; an Amal Monobloc from 1955; better brakes along the way; a new in-house gearbox in 1956; Girling shocks in 1957, and alternator electrics for 1958 with battery/coil ignition and an alloy primary chaincase.

Then in 1960 came the adoption of the firm's duplex frame with twin downtubes running down and under the engine.


Matchlesses on Now...
AJS Model 18 / Matchless G80 500cc Single Buying Guide 1962 AJS Model 18 Brochure

A complete redesign for 1964 resulted in a right revvy rasper in the shape of an agile short-stroker which used Norton forks, brakes and hubs; sadly short-lived as the company ceased production of all motorcycles in 1966. There's not too many of these around, and even fewer of the magnificent G85CS which used the AMC engine in a Metisse-inspired scrambles chassis.

The final fling for Matchless singles (there was no AJS equivalent this time around) came two decades later as the Harris Matchless which combined a Rotax engine and 1980's tech. Pleasingly peppy, free-revving and with naff-all flywheel effect, it feels nothing like a trad Brit thumper. Kickstarting can be tricky, so look out for ones with the electric button for an acceptable compromise between modern machinery and classic cred.

AJS Model 18 / Matchless G80 500cc Single Buying Guide Harris Matchless

Avoid hotch-potch home-builds which boost the firm's 350cc engines (normally stamped G3/M16) to 500; they'll be out of balance so will forfeit the 500's low-revving smooth delivery and lack of mechanical clatter. The primary drives on most AMC singles tend to leak, especially if ham-fisted previous owners have over-tightened them, so shun examples with snatchy power delivery and juddering clutches.

AJS Model 18 / Matchless G80 500cc Single Buying Guide 1949 AJS M18 sold by Bonhams for £3,450

The more stodgy AMC 500 singles still sell for under £3000. There's plenty of choice among the more nimble machines at £3500, and you'll pay around five grand for a real genuine competition model. For less than £4000 you get a very British classic motorcycle, one full of rugged charm and diehard reliability. They're easy to work on and the spares supply is excellent thanks to the active owners' club and some dedicated trade specialists.

Words: Rowena Hoseason, Photos: RC RChive, Martin Peacock, Bonhams auctioneer


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