Jawa 640 Sport (1995) vs Aprilia RS 125R Extrema (1994-95) vs Honda CB 125 (1974-75) vs Megelli Naked 250S (2013-)
Comparison technical specifications
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| Make: | Jawa | Aprilia | Honda | Megelli |
| Model: | 640 Sport | RS 125R Extrema | CB 125 | Naked 250S |
| Years: | 1995 | 1994-95 | 1974-75 | 2013- |
| Engine: | Two stroke, parallel twin | Single cylinder, two stroke, reed valves induction | Four stroke, twin cylinder, OHC, 2 valve per cylinder | Four stroke, single cylinder, SOHC, 4 valve per cylinder |
| Capacity: | 343.4 cc / 21.0 cu in | 125 cc / 7.6 cu in | 124 cc / 7.6 cu-in | 250 cc / 15.2 cu-in |
| Bore x Stroke: | 58 x 65 mm | 54 x 54.5mm | 44 x 41 mm | 77.0 x 53.6 mm |
| Compression Ratio: | 9.8:1 | 14.5:1 | 9.4:1 | 11.1:1 |
| Cooling System: | Air cooled | Liquid cooled | Air cooled | Liquid cooled |
| Induction: | Jikov 28-29 CE horizontal carburetor, slide type | Dell'Orto VHSB 34LD | 2x Keihin 22mm slide type manual choke | TK/MV34 carburetor |
| Ignition: | Magneto VAPE A67 contactless | Electronic | Battery & coil | CDI |
| Starting: | Kick | Electric | Kick | Electric |
| Max Power: | 17.2 kW / 23.5 hp @ 5250 rpm | 24.8 kW / 34 hp @ 11000 rpm | 15 hp / 10.9 kW @ 10500 rpm | 27 hp / 19.7 kW @ 9000 rpm |
| Max Torque: | 31.4 Nm / 3.2 kgf-m / 23.2 ft.lb @ 4750 rpm | 25 Nm / 2.5 kgf-m / 18.4 lb-ft @ 9000 rpm | 1.05 kgf-m / 7.5 lb-ft @ 9000 rpm | 22.3 Nm / 16.4 lb-ft @ 7000 rpm |
| Transmission: | 4 Speed | 6 Speed | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Front Suspension: | Hydraulic telescopic fork, steel spiral springs | Upside-down forks, Ø 40mm | Oil-damped telescopic forks | Telescopic forks |
| Rear Suspension: | Swingarm, hydraulic telescopic in suspension units, spiral springs | Monoshock | Dual shocks, swinging arm | Monoshock, pre-load adjustment |
| Front Brakes: | Ø265 mm Disc, hydraulic control | Single 320 mm discs, 4 piston caliper | Single 240mm disc | Single disc |
| Rear Brakes: | Ø165 mm Drum, mechanical control | Single 240 mm disc, 2 piston caliper | Drum | Single disc |
| Rear Tyre: | 2.15 B x 18" | 150/60-17 | 2.75-18 | 130/70-17 |
| Dry Weight: | 149 kg / 328 lbs | 115 kg / 254 lbs | 110 kg / 242.4 lbs | 135.0 kg / 297.6 lbs |
| Fuel Capacity: | 17 L / 4.5 US gal | 11.5 L / 3.0 US gal | 10 Litres / 10.6 US gal |