| MODEL | MATCHLESS G3 350 1958 |
| Year | 1958 |
| Engine Type | Single cylinder, four-stroke |
| Displacement / Capacity | 347 cc / 21.17 cu in |
| Bore X Stroke | 69 x 93 mm / 2.7 x 3.7 in |
| Compression Ratio | 6.5:1 |
| Cooling System | Air |
| Max Power | 13.1 kW / 18 hp @ 5750 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | Amal carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 4-speed |
| Clutch | Wet multiplate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic fork |
| Rear Suspension | Two shock absorbers |
| Front Brakes | Drum, 178 mm / 7.0 in |
| Rear Brakes | Drum, 178 mm / 7.0 in |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 179 kg / 394.6 lb |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 3.50-19 |
| FUEL SYSTEM | |
| Fuel Capacity | 19 Litres / 5.02 US gal |
| Fuel Consumption | — |
| Top Speed | 129 km/h / 80.2 mph |
The G3 was Matchless's 350 cc single-cylinder road model, a plain air-cooled four-stroke with dry-sump oiling and a four-speed chain-driven gearbox. In 1958 it carried telescopic forks, twin rear shock absorbers and drum brakes at both ends. It was a sporting but practical roadster of the post-war British single type.
