2006 Honda CR250R
General Specifications
| Model | Honda CR250R |
| Year | 2006 |
| Category | Motocross |
| Engine Type | 249 cc single-cylinder, two-stroke, liquid-cooled with reed-valve induction |
| Weight | Approximately 96 kg dry |
Engine
| Displacement | 249 cc |
| Bore x Stroke | 66.4 x 72.0 mm |
| Compression Ratio | Approximately 8.5:1 |
| Fuel System | 38 mm Mikuni TMX flat-slide carburettor | Replacement Options |
| Ignition | CDI electronic ignition |
| Spark Plug | NGK BR8EG |
| Spark Plug Gap | 0.5-0.6 mm |
| Cooling System | Liquid-cooled |
| Starting System | Primary kick starter |
Transmission
| Transmission | 5-speed constant-mesh |
| Clutch | Wet multi-plate |
| Final Drive | #520 chain |
Dimensions
| Overall Length | Approximately 2,185 mm |
| Overall Width | Approximately 830 mm |
| Overall Height | Approximately 1,280 mm |
| Wheelbase | Approximately 1,480 mm |
| Ground Clearance | Approximately 340 mm |
| Seat Height | Approximately 955 mm |
| Fuel Capacity | Approximately 7.7 L |
Chassis
Suspension
| Front Suspension | 47 mm Showa inverted twin-chamber cartridge fork, adjustable compression and rebound damping | Fork Oil Levels |
| Front Suspension Travel | Approximately 315 mm |
| Rear Suspension | Pro-Link Showa gas-charged monoshock, adjustable spring preload, compression and rebound damping |
| Rear Suspension Travel | Approximately 320 mm |
| Fork Oil | Honda Ultra Cushion Oil Special 5W or equivalent Showa-compatible fork fluid |
Brakes & Wheels
| Front Brake | Single hydraulic disc, twin-piston caliper |
| Rear Brake | Single hydraulic disc, single-piston caliper |
| Front Wheel Size | 21 x 1.60 in |
| Rear Wheel Size | 19 x 2.15 in |
Service Data
| Fuel Type | Premium unleaded petrol |
| Premix Information | 32:1 fuel-to-oil ratio using high-quality two-stroke racing oil | Premix Calculator |
| Gearbox Oil | Honda GN4 10W-40 or equivalent motorcycle oil; approximately 750 ml after draining and approximately 850 ml after disassembly |
| Air Filter | Washable oiled polyurethane foam element |
| Service Notes | Competition two-stroke motocross machine. Maintain correct premix ratio and inspect piston, rings, reed valves, air filter, gearbox oil, chain, brakes and suspension at regular race-service intervals. |
2006 Honda CR250R – Refining Honda’s Final Two-Stroke Generation
The 2006 Honda CR250R was a refinement of the aluminium-framed generation already established in the first half of the decade rather than a completely new motorcycle. By this stage Honda’s attention was increasingly focused on its CRF four-strokes, but the CR250R remained one of the company’s flagship two-stroke motocross machines and continued to receive detail development.
The engine retained its 249 cc liquid-cooled two-stroke layout with a 66.4 x 72.0 mm bore and stroke, reed-valve induction and Honda’s electronically controlled exhaust-valve system. Fuel was delivered by a 38 mm Mikuni TMX flat-slide carburettor. Correct jetting remains important on surviving bikes, and owners replacing worn induction components can compare replacement carburettor options.
Honda’s aluminium twin-spar frame remained a defining feature of the CR250R. The chassis was designed to give the bike precise steering while retaining stability through rough sections, and Showa suspension was fitted at both ends. The 47 mm twin-chamber fork offered extensive compression and rebound adjustment, while the Pro-Link rear suspension used a fully adjustable Showa shock. Owners servicing the front end can refer to the MXOwners fork oil reference.
The 2006 CR250R is historically interesting because it sits near the end of Honda’s full-size two-stroke motocross era. The model still offered the light feel, simple engine layout and explosive power delivery that made 250 two-strokes popular, but the market was rapidly moving toward four-stroke machinery. Owners restoring or maintaining one today can use the MXOwners Parts Finder when checking replacement components and model-year compatibility.
