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Suzuki RG 250

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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

62.7o

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