Classic Bikes Custom Bikes Individual Racing Bikes AJP AJS Aprilia Ariel Avinton / Wakan Bajaj Benelli Beta Bimota BMW Brough Superior BRP Cam-Am BSA Buell / EBR Bultaco Cagiva Campagna CCM CF Moto Combat Motors Derbi Deus Ducati Excelsior GASGAS Ghezzi Brian Gilera GIMA Harley Davidson Hero Highland Honda Horex Husaberg Husqvarna Hyosung Indian Jawa Kawasaki KTM KYMCO Laverda Lazareth Magni Maico Mash Matchless Mondial Moto Guzzi Moto Morini MV Agusta MZ / MuZ NCR Norton NSU Paton Peugeot Piaggio Revival Cycles Roland Sands Royal Enfield Sachs Sherco Sunbeam Suzuki SWM SYM Triumph TVS Ural Velocette Vespa Victory Vincent VOR Voxan Vyrus Walt Siegl Walz Wrenchmonkees Wunderlich XTR / Radical Yamaha Zero Video Technical
Complete Manufacturer List

Suzuki RG 250

Model.	Suzuki RG 250
Year	1978 - 79
Engine	Horizontal parallel twin, 2-stroke, piston reed valve
Capacity	247 cc / 15.1 cu in
Bore x Stroke	54 x 54 mm
Compression Ratio	6.7:1
Starting	Kick
Max Power	22.4 kW / 30 hp @ 8.000 rpm
Max Torque	28.4 Nm / 2.9 kgf-m / 21 lb-ft @ 7000 rpm
Transmission	6 Speed, constant mesh
Final Drive	Chain
Gear Ratios	1st 2.500 / 2nd 1.625 / 3rd 1.210 / 4th 1.000 / 5th 0.868 / 6th 0.782
Front Suspension	Telescopic fork
Rear Suspension	Dual shocks, coil springs
Front Brakes	Single disc
Rear Brakes	Drum
Front Tyre	3.00-18
Rear Tyre	3.25-18
Caster	62.7^o
Trail	107 mm / 4.2 in
Dimensions	Length: 2005 mm / 78.9 in Width: 760 mm / 29.9 in Height: 1055 mm / 41.5 in
Wheelbase	1320 mm / 52.0 in
Dry Weight	126 kg / 278 lbs
Fuel Capacity	15 L / 4.0 US gal / 3.3 Imp gal
Standing ¹/₄ Mile	14.2 sec

RG250 and it's sister model RG250E were launched 1978, simultanously with RG125 and RG185, formerly knows as GT125 and GT185. The RG250 wasn't just a GT250 with new paint job. It was a completely new machine.

Many 250 cc motorcycles at the time were heavy and clumsy because the frames weren't often designed for the small engine. It was common to put a 250 engine into a 350 or 400 frame.

This wasn't the case with the RG250 (known as X-7 in many countries outside Japan). While the 1977 GT250 was a light motorcycle with its 146 kg (321 lbs) the new RG250 was 20 kg (45 lbs) lighter, making it super lightweight. The 30 hp's of the RG250 made the bike quite speedy, thanks to the good power/weight ratio. It's no rocket, though. According to a Japanese test the bike made the 1/4 mile (400 m) at 14.2 seconds.

The RG250 kept the Ram Air cooling system of the GT250, that pressed the air through the cylinder head ribbons, a quite effective cooling system and it actually works.

The RG250E had alloy cast wheels, the RG250 had classic steel wire rims. There was also some differences in the colors, otherwise it was the same model.
Source: Suzuki Cycles