Yamaha YZ250F 2020 vs. Yamaha YZ450F 2019

The Yamaha YZ250F 2020 and the Yamaha YZ450F 2019 are both motocross bikes from Yamaha, but they have some key differences in their technical specifications.

Starting with the engine and drivetrain, the Yamaha YZ250F 2020 has a bore of 77 mm and a stroke of 53.6 mm, while the Yamaha YZ450F 2019 has a larger bore of 97 mm and a stroke of 60.8 mm. This means that the YZ450F has a larger displacement of 449cc compared to the YZ250F's 250cc. The compression ratio is higher in the YZ250F at 13.5, while the YZ450F has a slightly lower compression ratio of 12.5. Both bikes have fuel injection systems and a single cylinder, four-stroke engine.

In terms of suspension, both bikes have a telescopic front fork with 310mm of travel. The YZ250F has a rear suspension with a swingarm and a monoshock, offering 315mm of travel. On the other hand, the YZ450F also has a swingarm rear suspension with a monoshock, but it offers slightly more travel at 317mm. Both bikes have adjustable compression, preload, and rebound settings for the front and rear suspension.

Yamaha YZ250F 2020

In terms of chassis, both bikes have an aluminum frame and a double tube frame type. This provides strength and stability for aggressive motocross riding.

Both bikes have hydraulic front brakes with a diameter of 270mm, providing reliable stopping power. The YZ250F has an 80mm wide front tire with a 21-inch diameter, while the YZ450F has the same front tire dimensions. However, the YZ450F has a wider rear tire at 110mm compared to the YZ250F's 100mm. Both bikes have a 19-inch diameter rear tire.

Yamaha YZ450F 2019

In terms of dimensions and weight, both bikes have a similar wheelbase, with the YZ250F measuring at 1475mm and the YZ450F at 1480mm. The seat height is the same for both bikes at 965mm. The YZ250F weighs slightly less at 105kg, while the YZ450F weighs slightly more at 112kg.

Now, let's compare the strengths and weaknesses of each bike. The Yamaha YZ250F 2020 has strengths in its chassis, torque, engine, brakes, Power Tuner application, mapping switch, and traceability. The Yamaha YZ450F 2019 also has strengths in its chassis, torque, engine, brakes, Power Tuner application, mapping switch, and start control system. Both bikes have the same weakness, which is that the intake noise takes some time to get used to.

In conclusion, the Yamaha YZ250F 2020 and the Yamaha YZ450F 2019 are both high-performance motocross bikes with their own unique features and strengths. Riders can choose between the YZ250F's smaller displacement and lighter weight or the YZ450F's larger displacement and slightly more advanced features. Ultimately, the choice will depend on the rider's preferences and riding style.