Kawasaki ER-6n (2011) vs Aprilia SX 125 (2008-09) vs Yamaha WR 250F (2020-21)
Comparison technical specifications
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| Make: | Kawasaki | Aprilia | Yamaha |
| Model: | ER-6n | SX 125 | WR 250F |
| Years: | 2011 | 2008-09 | 2020-21 |
| Engine: | Four stroke, parallel twin, DOHC, 4 valves per cylinder. | Two stroke, single cylinder Aluminium cylinder with Nikasil coated liner. Read valve intake. Separate mixing. Homologated to Euro 3 standard. | Four stroke, single cylinder, DOHC, 4 valve Titanium |
| Capacity: | 649 cc / 39.6 cu-in | 125 cc / 7.6 cu-in | 249 cc / 15.2 cu-in |
| Bore x Stroke: | 83 X 60 mm | 54 x 54.5 mm | 77 x 53.6 mm |
| Cooling System: | Liquid cooled, | Liquid cooled | Liquid cooled, |
| Compression Ratio: | 11.3;1 | 12.5:1 | 13.5:1 |
| Induction: | 2x 38mm Electronic Fuel Injection Keihin | DellOrto VHST 28 | 44 mm Keihin throttle body F.I. |
| Ignition: | Digital TCBI | Electronic CDI | TCI: Transistor Controlled Ignition |
| Starting: | Electric | Kick | Electric / Kick |
| Transmission: | 6 Speed | 6 Speed | 5 Speed Wide ratio |
| Final Drive: | Chain | Chain | #520 Chain |
| Frame: | Diamond, high-tensile steel | High strength steel frame with double trellis beam and double cradle. Separate seat frame. | Aluminium Bilateral Beam |
| Front Suspension: | 41 mm telescopic fork, | Upside down telescopic fork, Ø40 mm | 48 mm inverted fork, Adjustable |
| Front Wheel Travel: | 120 mm / 4.7 in | 260 mm / 10.2 in | 310 mm / 12.2 in |
| Rear Suspension: | Offset laydown single-shock with adjustable preload, | Steel swingarm. Hydraulic monoshock with piggy back cylinder | KYB Fully adjustable single shock |
| Rear Wheel Travel: | 130 mm / 5.1 in | 270 mm / 10.6 in | 315 mm / 12.4 in |
| Front Brakes: | 2x 300mm discs 2 piston calipers | Single 260mm disc, sliding 2 piston caliper, Brembo | Single 270mm floating wave disc 2 piston caliper |
| Rear Brakes: | Single 220mm disc 1 piston caliper | Single 220mm disc, sliding 1 piston caliper | Single 245mm disc 1 piston caliper |
| Front Tyre: | 120/70ZR17 | 110/70 17 | 80/100-21 |
| Rear Tyre: | 160/60ZR17 | 150/60 17 | 100/100-18 |
| Seat Height: | 785 mm / 30.9 in | 870 mm / 34.3 in | 965 mm / 38.0 in |
| Fuel Capacity: | 15.5 Litres / 4.1 US gal | 10 liters / 2.6 US gal | 7.5 Liters / 2.0 gal |