Yamaha YZ250F 2020 vs. Yamaha YZ450F 2019

The Yamaha YZ250F 2020 and the Yamaha YZ450F 2019 are both motocross bikes with impressive technical specifications. Let's compare these two models in terms of their engine and drive train, suspension, chassis, brakes, dimensions and weights, as well as their strengths and weaknesses.

In terms of engine and drive train, the Yamaha YZ250F 2020 has a bore of 77 mm, stroke of 53.6 mm, and a compression ratio of 13.5. It features a fuel injection system and a kick starter. On the other hand, the Yamaha YZ450F 2019 has a larger bore of 97 mm, stroke of 60.8 mm, and a compression ratio of 12.5. It also has a fuel injection system but comes with an electric starter. Both bikes have a single cylinder and are 4-stroke engines, with the YZ250F having a displacement of 250ccm and the YZ450F having a displacement of 449ccm.

Moving on to the suspension, both bikes have upside-down telescopic forks for the front suspension with a travel of 310 mm. They also have swing arm rear suspensions with monoshock absorbers and a travel of 315 mm for the YZ250F and 317 mm for the YZ450F. The suspension on both models can be adjusted for compression, preload, and rebound.

Yamaha YZ250F 2020

In terms of chassis, both bikes have aluminum frames with a twin tube design, providing strength and stability during motocross riding.

When it comes to brakes, both models have front brakes with a diameter of 270 mm and hydraulic actuation, ensuring reliable stopping power.

In terms of dimensions and weights, the Yamaha YZ250F 2020 has a front tire width of 80 mm and a diameter of 21 inches, while the rear tire has a width of 100 mm and a diameter of 19 inches. It has a wheelbase of 1475 mm, a seat height of 965 mm, and a kerb weight of 105 kg. On the other hand, the Yamaha YZ450F 2019 has a front tire width of 80 mm and a diameter of 21 inches, while the rear tire has a width of 110 mm and a diameter of 19 inches. It has a slightly longer wheelbase of 1480 mm, the same seat height of 965 mm, and a slightly heavier kerb weight of 112 kg.

Yamaha YZ450F 2019

Now let's discuss the strengths of each model. The Yamaha YZ250F 2020 boasts a series chassis, providing excellent handling and stability on the track. It also has a powerful engine and effective brakes, ensuring impressive performance. Additionally, it features the Powertuner App and Mapping Switch, allowing riders to customize their bike's performance to suit their preferences. The YZ450F 2019, on the other hand, has a standard chassis that still offers great performance. It also has a torquey engine and reliable brakes. Like the YZ250F, it also features the Powertuner App, Mapping Switch, and an additional Launch Control System, enhancing its performance on the track.

Both models have a weakness in terms of intake noise, which may take some getting used to for riders.

In conclusion, the Yamaha YZ250F 2020 and the Yamaha YZ450F 2019 are both impressive motocross bikes with their own strengths and weaknesses. The YZ250F excels in its series chassis and trackability, while the YZ450F offers a torquey engine and the added benefit of a Launch Control System. Riders can choose between these two models based on their preferences and requirements for motocross riding.