HONDA The Power of Dreams

In 2006, Honda introduced the all-new CRF150R and CRF150RII motocross models, both powered by newly developed liquid-cooled four-stroke engines, as 2007 models.

The CRF150R featured a 17-inch front wheel and a 14-inch rear wheel, while the CRF150RII was equipped with larger 19-inch front and 16-inch rear wheels.

The CRF150R lineup was offered in two versions, allowing riders—from beginners entering motocross to more experienced competitors—to choose the model best suited to their preferences and physique.

The development of the CRF150R series was prompted by a revision to FIM (Fédération Internationale de Motocyclisme) regulations for the 2007 season, which permitted four-stroke 150cc motorcycles to compete alongside two-stroke 85cc machines.

Until then, Honda’s small-displacement motocross lineup consisted of the two-stroke CR85R and CR85RII. The new regulations provided the opportunity to transition the class to four-stroke power with the introduction of the CRF150R series.

The newly developed 149.7cm³ water-cooled, four-stroke, OHC single-cylinder engine adopted Honda’s Unicam valve train, which uses a single camshaft to actuate all valves, the same design employed on the CRF450R and CRF250R.

Combining high output with a lightweight, compact design, the engine produced a maximum output of 18.0kW (24.5PS) at 12,500rpm, delivering performance that closely approached the 19.2kW (26.1PS) at 12,000rpm produced by the CR85R.

A lightweight mini-skirt piston fitted with two forged piston rings helped reduce frictional losses. The connecting rod received a double-carburizing treatment, while a needle roller bearing was adopted at the big end. Together, these features contributed to excellent high-rpm performance and outstanding durability.

To improve cooling efficiency, the radiators were positioned symmetrically on either side of the motorcycle. This dual-radiator layout was the carried over from the larger-displacement CRF250R.

The frame employed a semi-double-cradle design constructed from lightweight, highly reliable high-tensile steel.

Its slim profile delivered the high level of maneuverability demanded in motocross riding.

An inverted telescopic front fork was paired with Honda’s proprietary Pro-Link rear suspension, while the swingarm featured a tapered design that combined low weight with high rigidity.

Through comprehensive weight reduction measures, the CRF150R achieved a dry weight of just 75kg.

Like the CRF450R and CRF250R, the CRF150R series was finished in Extreme Red, a vivid color that stood out on the motocross circuit.

Following the FIM regulation change, the MFJ (Motorcycle Federation of Japan) also revised its competition rules, allowing the CRF150R series to compete in the two-stroke 85cc class in MFJ-sanctioned events.

In 2007, rider Haruna Masu switched from the Honda CR85RII to the CRF150RII to compete in the MFJ All Japan Motocross Championship Ladies Class.

Adapting to the new four-stroke machine required changes to both her riding style and motorcycle control. Even so, she claimed three race victories during the season and finished second in the championship standings in the CRF150RII’s debut season.

In the 2008 season, Masu and the CRF150RII won eight of the ten rounds, securing the Ladies Class championship. It marked the first championship title for both Masu and the CRF150RII.

Masu and the CRF150RII went on to win four consecutive Ladies Class championships from 2008 through 2011, demonstrating the motorcycle’s outstanding competitiveness.

The CRF150R series has continued to achieve numerous successes in the MFJ All Japan Motocross Championship Ladies Class, remaining a consistent championship contender for many years.

Competing for TEAM HAMMER, Yuna Takeuchi captured the series title in 2014 and 2017. More recently, Manaka Kawai of T.E.SPORT has demonstrated exceptional dominance, winning five series titles between 2020 and 2025.

Since the introduction of the 2007 model, the CRF150R series has continued to evolve through ongoing refinement while earning broad support from riders ranging from motocross beginners to serious racers.