1965 Matchless G12CSR
650 Twin
1965 MATCHLESS G12CSR – A BRIEF HISTORY
Matchless built their first vertical twin in 1949, the 500cc G9. In 1956, they punched it out to 600cc and named it the G12 (seen here). In 1959 they punched it out again to 650cc and called it the G15. In 1963 there were four models offered of the G12. There was the Standard, De Lux, the CS (Competition Sport) and the CSR (Competition Sport, Road). They all were 646cc vertical twins with the 4-speed AMC gear box, Lucas magneto ignition. The CS and CSR came with alloy fenders, siamezed exhaust, and quick detachable headlight. The CS had a small 2-gallon competition fuel tank, skid plate and western style handlebars. An option offered for these bikes was a speed kit that consisted of 10.5:1 compression pistons, hotter camshaft and dual carburetors. These additions proved to over stress an already fragile crankshaft. The AJS version was the Model 31 and they came in AJS Mediterranean Blue.
1965 Matchless G12CSR SPECIFICATIONS
| Model Designations, Matchless/AJS Engine type Displacement Bore & Stroke Compression ratio Lubrication Oil capacity Fuel system Ignition System Power output Battery Primary drive Clutch Gearbox Final drive Suspension, front Suspension, rear Brakes, front Brakes, rear Frame type Tire, front Tire, rear Dry weight Fuel capacity Fuel economy Top speed |
G12 / Model 31 Air-cooled OHV vertical twin 646cc / 39.4 ci 72mm X 79.3mm 7.5:1 Dry sump 2.5 L / 5.3 US pints 1 – Amal 389 1-1/8″ Lucas distributor & points 35 hp @ 6,500 rpm Lucas 6V 12aH 1/2″ X 5/16″ single chain Multi-plate, wet 4-speed, right-foot shift 5/8″ X 3/8″ chain, 96 links AMC Teledraulic forks Swing arm w/2 shocks 7 -n SLS drum 7-in SLS drum Double cradle 3.25″ X 19″ Dunlop 3.50″ X 19″ Dunlop 396 lbs / 180 kg 4.5 US gal / 17 L 55 mpg / 23.4 km/L 95 mph |
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