The latest FRP 450S off-road motorcycle is equipped with a 449cc single-cylinder four-stroke engine, which offers top-notch power output, with a peak power of 51.7 horsepower (38.6kW) at 9,500 RPM and a torque output of 47.2Nm at 7,100 RPM, achieving a power density of 0.115kW/kg (curb weight 105kg). Compared with the previous generation product, the power has increased by 12.4%, surpassing the 49.8 horsepower of the competing Honda CRF450R (the measured data is from the comparison test of Dirt Bike Magazine in November 2023).
Technological innovation has optimized combustion efficiency. The 76mm super-large cylinder bore, combined with forged lightweight pistons (weighing 198g), has increased the compression ratio to 13.5:1 (requiring 98-octane gasoline). The dual overhead camshafts are equipped with titanium alloy valves (intake 34.9mm/ exhaust 30.5mm), reducing the valve response time to 0.018 seconds (30% faster than the traditional design), ensuring a torque output of over 85% in the 3000-9000 RPM range. The Bosch ECU from Germany, in coordination with the electronic throttle (with an opening and closing Angle from 0 to 90° in just 0.22 seconds), reduces power delay to less than 80 milliseconds (the market average is 120 milliseconds).
The thermal management capability ensures performance under extreme conditions. The dual water pump circulation system (flow rate 5.6L/min) +32 heat dissipation fins design keeps the oil temperature in the desert endurance race stable at 128°C (the safety threshold is 145°C). The 2023 Baja 1000 event verified that it had no power attenuation under full throttle conditions for 8 consecutive hours (ambient temperature 42°C), while its competitors experienced an 11% power attenuation (as officially recorded by SCORE in the United States).
The linear optimization of power output significantly enhances the handling accuracy. The six-speed close-toothed transmission (gear ratio 1:2.76 to 1:0.86) achieves a gear ratio drop of only 8-12%. The maximum traction force of the second gear reached 1,832N (11% higher than that of the Yamaha YZ450F in the Deep Sand test), and combined with the hydraulic clutch (operating force 21N±1.5), the shift frequency for forest road riding was reduced by 37%. It is worth noting that the engine tilt Angle design has been moved forward by 4°, keeping the center of gravity height at 585mm (the traditional design is 615mm), and the tolerance for cornering side tilt Angle has increased by 8°.
The balance between durability and maintenance economy is outstanding. The wear resistance coefficient of the ceramic-coated cylinder (with a hardness of 1,200HV) is 3.3 times that of the ordinary nickel-coated cylinder, ensuring that the cylinder pressure drop is ≤4% after 150 hours of track driving (the industry average is 8%). User maintenance cost measurement: The piston ring replacement cycle is 75 hours (cost 58), and the throttle body cleaning interval is 100 hours (saving 42 labor costs per time). The designed service life of the entire machine is 1,200 hours (calculated based on an average of 200 hours of training per year), and the residual value rate still reaches 38% after five years (the industry average is 28%).
The environmental compliance data of Bosch leads its peers. The closed-loop electronic fuel injection system (air-fuel ratio 14.7±0.3) combined with the dual-channel oxygen sensor reduces the hydrocarbon emissions (1.08g/kWh) to only 36% of the Euro V limit. The German TUV energy consumption certification shows that the fuel consumption under mixed conditions is 2.85L per 100 kilometers (4.7L on the full throttle track), and the CO₂ emissions per kilometer are as low as 68g (14% lower than the average of competitors).
The performance advantage of the dirt bike was verified in professional riding scenarios. In the lap time test on a standard 1.2-kilometer off-road track (including 15 turns and 3 jumps), the Dirt Bike was on average 1.7 seconds faster than its competitors (with a total lap time difference of 2.4%). The French Enduro national team has reported that the linear power output feature has shortened the adaptation period for new drivers to 15 hours (compared to 25 hours for the model), and the standard deviation of torque fluctuation is controlled within ±0.8Nm (±2.1Nm for competitors), significantly reducing the handling error rate. When making a purchase decision, it should be noted that for high-performance engines, it is recommended to use API SL grade fully synthetic engine oil in combination (with a replacement cycle of 15 hours), and check the crankshaft radial clearance (tolerance 0.03-0.05mm) every 50 hours.