| Model | Yamaha YZ250 |
| Year | 2016 |
| Category | Motocross / Competition Off-Road |
| Engine Type | Liquid-cooled, single-cylinder, 2-stroke, reed-valve induction with Yamaha Power Valve System (YPVS) |
| Weight | 103 kg (227 lb) wet / curb weight |
| Displacement | 249 cc |
| Bore x Stroke | 66.4 x 72.0 mm |
| Compression Ratio | 8.9–10.6:1 |
| Fuel System | Keihin PWK38S, 38 mm flat-slide carburettor with throttle-position sensor and reed-valve induction | Replacement Options |
| Ignition | CDI magneto ignition |
| Spark Plug | NGK BR8EG |
| Spark Plug Gap | 0.5–0.6 mm (0.020–0.024 in) |
| Cooling System | Liquid-cooled, twin radiators |
| Starting System | Kick starter |
| Transmission | 5-speed constant-mesh close-ratio manual |
| Clutch | Wet, multi-plate, cable-operated |
| Final Drive | Chain drive; standard gearing 14T front / 50T rear (3.571:1) |
| Overall Length | 2,179 mm |
| Overall Width | 827 mm |
| Overall Height | 1,307 mm |
| Wheelbase | 1,481 mm |
| Ground Clearance | 382 mm |
| Seat Height | 994 mm |
| Fuel Capacity | 8.0 litres |
| Frame | Aluminium semi-double-cradle frame with removable aluminium rear subframe |
| Front Tyre | 80/100-21 51M, Dunlop Geomax MX52, tube type | Tyre Size Guide |
| Rear Tyre | 110/90-19 62M, Dunlop Geomax MX52, tube type | Tyre Size Guide |
| Front Suspension | 48 mm KYB upside-down Speed Sensitive System (SSS) twin-chamber spring forks, fully adjustable compression and rebound damping | Fork Oil Levels |
| Front Suspension Travel | 300 mm (11.81 in) |
| Rear Suspension | KYB gas/oil-damped Monocross linkage shock with adjustable spring preload, high-speed and low-speed compression damping and rebound damping |
| Rear Suspension Travel | 315 mm (12.40 in) |
| Fork Oil | Yamaha Suspension Oil S1. KYB twin-chamber forks: inner damper filled and bled to a final oil level of 145–148 mm from the top of the fully extended damper assembly. Outer chamber standard quantity: 320 mL per leg (10.8 US oz). Outer chamber adjustment range: 300–365 mL per leg. Inner and outer chambers are serviced separately. Follow the 2016 Yamaha service procedure when bleeding the inner damper. |
| Front Brake | Hydraulic single disc, 250 mm rotor, twin-piston caliper |
| Rear Brake | Hydraulic single disc, 245 mm rotor, single-piston caliper |
| Front Wheel Size | 21 x 1.60-inch black aluminium Excel spoked rim |
| Rear Wheel Size | 19 x 2.15-inch black aluminium Excel spoked rim |
| Fuel Type | Premium unleaded petrol, minimum 95 RON, mixed with suitable competition-grade 2-stroke oil |
| Premix Information | 30:1 petrol-to-oil ratio using Yamaha Yamalube 2-R or suitable equivalent 2-stroke oil. Approximately 33.3 mL oil per litre of petrol | Premix Calculator |
| Gearbox Oil | Yamalube SAE 10W-40 motorcycle oil, API SG or higher, JASO MA. Periodic transmission oil change: 0.75 L (750 mL). Total transmission oil capacity: 0.80 L (800 mL). |
| Air Filter | Reusable, oil-treated foam air-filter element |
| Service Notes | The 2016 YZ250 was mechanically similar to the revised 2015 model, with black Excel rims, a gold drive chain and updated graphics. Maintain the specified 30:1 fuel premix and adjust carburettor jetting for temperature, altitude and riding conditions. Inspect piston, piston rings, reed valves and YPVS components according to competition operating hours. Spark plug tightening torque: 20 Nm (14 ft-lb). Clean and oil the foam air filter regularly and change transmission oil frequently under racing conditions. Inspect fork seals, steering-head bearings, suspension linkage bearings, wheel bearings, coolant, brake pads, drive-chain tension and spoke tension. Australian-market motorcycles were offered with a promotional race kit including performance accessories; these should not be confused with standard factory specifications
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