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MOTORCROSS - RX 250 2T
RX 250 2T
The heart of the RX 250 2T is a completely new engine, designed for one purpose only: competition. Unlike the 350, the architecture of this engine is entirely dedicated to the pursuit of maximum performance, with explosive power delivery and exceptional thrust at high revs, just as required for track riding.
| Displacement | Bore | Dry weight | Ground clearance |
|---|---|---|---|
| 249,3 CC | 66,4 mm | 100 kg | 340 mm |
ENGINE
EXPLOSIVE POWER
The heart of the RX 250 2T is a completely new engine, designed for one purpose only: competition. Unlike the 350, the architecture of this engine is entirely dedicated to the pursuit of maximum performance, with explosive power delivery and exceptional thrust at high revs, just as required for track riding.
AN ENGINE BORN ON THE TRACK
The RX 250 2T engine is not an adjustment, but an entirely new design, developed with a single focus: competition in the MX2 Class. Every single element of the thermal unit has been designed for this engine; head, cylinder, crankshaft, crankcase, and so on. Nothing has been left to chance. The result is explosive power delivery and exceptional thrust at high revs, giving you the maximum advantage anytime, anywhere.
In Detail
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NISSIN BRAKING SYSTEM
The Nissin system with 260 mm (front) and 240 mm (rear) Galfer discs ensures powerful and modulated braking. It allows you to precisely manage the 250's great responsiveness, ensuring decisive braking and total control to maintain maximum speed in corners.
DEDICATED GEAR RATIO
The 13/50 final gear ratio is a specific choice for the 250 2T, designed to enhance its character. Maximum responsiveness and acceleration out of corners, to effectively transfer all the engine's power to the ground.
Handlebar silent blocks
The silent blocks on the handlebar reduce vibrations and improve comfort. This translates into less fatigue for the rider, who can thus maintain maximum performance for longer.
RADIATORS
Radiators with a reinforced structure are essential for a high-performance engine like the 250 2T. They guarantee optimal cooling even during the most intense use in competition, ensuring maximum reliability when the engine is called upon to give its all.
SINGLE SPARK PLUG HEAD
The choice of a single spark plug head is a key element that defines the character of the 250. This configuration has been developed to maximise performance at high revs, ensuring that explosive power delivery that allows riders to exploit every single horsepower of the engine.
CRANKSHAFT AND CRANKCASE
No compromises: the crankshaft has a dedicated 72mm stroke and the crankcase features internal machining and intake passages with geometries unique to the 250. Each component has been engineered for the specific architecture of this engine.
DEDICATED THERMAL UNIT
The cylinder, piston and exhaust valve have been designed from scratch specifically for this displacement. The valve timing, with dedicated springs, has been finely calibrated to support the responsive and powerful nature of the engine.
KYB SUSPENSION
The bike is equipped with a 48mm KYB fork and a 50mm monoshock, the absolute benchmark in the world of motocross. A dedicated calibration, designed to support the explosive character of the engine and the lightness of the bike, ensuring maximum precision when entering corners and the necessary stability on the most demanding jumps.
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Technical Specifications
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CHASSIS
▼| Frame | Molybdenum steel with double cradle split above the exhaust port |
| Wheelbase | 1482 mm |
| Max length | 2177 mm |
| Max width | 830 mm |
| Max height | 1260 mm |
| Seat height | 945 mm |
| Ground clearance | 340 mm |
| Footrest height | 422 mm |
| Dry weight | 100 kg (front 48 kg; rear 52 kg) |
| Fuel tank capacity | 7,0 l |
| Cooling system capacity | 1,3 l |
| Front suspension | Kayaba Hydraulic USD closecartridge fork with ø 48 mm shaft |
| Rear suspension | Kayaba Monoshock with progressive compound lever |
| Shock absorber stroke | 133 mm |
| Front wheel travel | 305 mm |
| Rear wheel travel | 300 mm |
| Front brake | Wave disc ø260 mm and double-piston floating caliper |
| Rear brake | Wave disc ø240 mm and single-piston floating caliper |
| Front rim | 21 x 1,6 – 36 holes |
| Rear rim | 19 x 2,15 – 36 holes |
| Front tyre | 80/100 – 21 |
| Rear tyre | 110/90 – 19 |
ENGINE
▼| Type | Single cylinder, 2-stroke, liquid-cooled |
| Bore | 66,4 mm |
| Stroke | 72 mm |
| Displacement | 249,3 cc |
| Compression ratio | 14,6:1 |
| Exhaust Valve | BPV system |
| Starter | Electric starter |
| Ignition | AC Kokusan – digital CDI |
| Spark plug | NGK LKAR 8A-9 |
| Induction system | Induction reed |
| Lubrication | Mixing |
| Carburettor | Keihin PWK 38 |
| Clutch | Wet multi-disc clutch |
| Primary drive | Z. 27/72 |
| Transmission | 5 gears |
| Final transmission | Chain |
| Engine oil | SAE 10W/50 |