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Matchless G2/CS

Make Model	Matchless G2 / G2S / G2CS
Year	1958 - 62
Engine	Single cylinder, 4 stroke
Capacity	248.5 cc / 15.2 cub in.
Bore x Stroke	69.85 x 64.84 mm
Cooling System	Air cooled
Compression Ratio	G2 / G2S: 7.8:1 G2CS: 10.5:1
Fuel System	G2 / G2S: Amal monobloc 376/5 carburetor G2CS: Amal monobloc 376/276 carburetor
Lubrication	Dry sump, external tank
Engine Oil	Hot: SAE 50 Cold: SAE 30 Extreme cold: SAE 20
Oil Capacity	1.4 L / 3 US pints
Exhaust	Single
Starting	Kick
Clutch	Wet, multi-plate
Transmission	4-Speed
Final Drive	Chain
Chain Links	G2 / G2S: 123 links G2CS: 131 links
Internal Gear Ratios	1st 2.42 / 2nd 1.85 / 3rd 1.30 / 4th 1.0:1
Frame	Open, tubular steel frame, closed at the bottom by a pressed-steel channel
Front Suspension	Telescopic fork
Rear Suspension	Swinging-arm, with shocks and coil springs
Front Brakes	Drum
Rear Brakes	Drum
Wheels	Steel, wire spokes
Front Tyre	3.25 x 17 in.
Rear Tyre	3.25 x 17 in.
Wheelbase	1345 mm / 53 in.
Ground Clearance	140 mm / 5.5 in.
Seat Height	760 mm / 30 in.
Dry Weight	148 kg / 325 lbs
Fuel Capacity	12.5 L / 3.3 US gal

It was in 1958 that Associated Motorcycles announced the AJS Model 14 and Matchless G2, ostensibly a new range of unit construction 4-stroke 250s; the market reacted unenthusiastically. The engine was bulky for the quarter litre class and, on closer examination, still used a separate gearbox, requiring manual adjustment of the primary chain. The fact the chassis employed similar components to the James & Francis Barnett lightweights also drew further adverse comment.

"Tank badge for G2