2003 Honda CR250R

2003 Honda CR250R – Refining Honda’s New-Generation Two-Stroke

The 2003 Honda CR250R was primarily an evolutionary update to the substantially redesigned 2002 model rather than another new generation. Honda entered 2003 with the basic aluminium chassis and revised two-stroke engine architecture already established, concentrating on refinement rather than starting again. For owners today, that makes the 2003 CR250R closely related to the 2002 machine while still representing another stage in the development of Honda’s final generation of 250cc two-stroke motocross bikes.

The engine remained a 249cc liquid-cooled two-stroke single using a 66.4 mm bore and 72.0 mm stroke. A 38 mm Mikuni TMX carburettor handled fuel delivery, while Honda’s electronically controlled exhaust power-valve system helped broaden the engine’s usable power range. On a surviving CR250R, carburettor condition and jetting can have a considerable effect on starting, throttle response and overall performance, so the MXOwners carburettor information and replacement options can be useful when servicing the induction system.

The aluminium twin-spar chassis continued Honda’s long-running development of aluminium motocross frames. Showa suspension was used at the front, with an inverted cartridge fork providing approximately 305 mm of travel, while Honda’s Pro-Link rear suspension provided approximately 320 mm. Age and previous maintenance now matter as much as the original settings, making fork seals, bushings, shock condition and linkage bearings important inspection points. Owners servicing the front end can refer to the MXOwners fork oil level reference.

The 2003 CR250R retained the standard full-size motocross combination of a 21-inch front wheel and 19-inch rear wheel with 80/100-21 and 110/90-19 tyres. Owners comparing modern replacements can use the MXOwners motorcycle tyre size guide.

For owners and restorers, the 2003 CR250R is an interesting machine because it combines Honda’s mature aluminium chassis technology with the simplicity and character of a competition two-stroke. Regular air-filter maintenance, fresh transmission oil, correct chain adjustment and consistent premix preparation remain essential. The MXOwners two-stroke premix calculator can help calculate the required oil quantity when preparing fuel. While 2003 did not bring the dramatic redesign seen a year earlier, it continued the refinement of the final CR250R generation and remains a significant part of Honda’s two-stroke motocross history.