The 2018 and 2019 Yamaha YZ450FX have been staple dirt bikes in the off-road community, each model boasting its unique features, improvements, and reasons for interest. Let's delve into the key aspects of these two popular motocross bikes to help you discern which one may be the better choice.
Before we dive into the specifics, it's crucial to understand that Yamaha has progressively upgraded the YZ450FX, making the 2019 model a more refined iteration of the 2018 model. However, the differences aren't always quantifiable, and personal preference often plays a significant role in choosing the right dirt bike.
Engine and Performance
The YZ450FX's 450cc liquid-cooled, DOHC 4-t-Valve engine, or 'piston valve' as Yamaha refers to it, is a highlight of both models. However, the 2019 model boasts some subtle but notable upgrades in this department.
A distinctive improvement in the 2019 YZ450FX is the adoption of an electronic injection system. This change has resulted in improved throttle response and consistency in power delivery, enhancing rideability across varied terrains.
Power Output
Both models maintain a similar power output, geared towards aggressive motocross racing and trail riding. However, the 2019 model's refined fuel injection system helps it edge out slightly in smooth, consistent power delivery.
Users have reported an ever-so-slightly higher top-end from the 2019 model, although the difference is negligible and varies from rider to rider. Nevertheless, it's a testament to Yamaha's ongoing commitment to improving engine performance.
Engine Management
The 2019 YZ450FX introduces an updated engine control unit (ECU) that optimizes the bike's numerous engine maps. This feature allows riders to adjust the power, traction control, and maps for launch, tuning, and off-road riding with unprecedented ease.
While the 2018 model also offered multiple engine maps, the 2019 version's refined ECU allows for more subtle calibrations, providing unparalleled adjustability for varying conditions and riding styles.
Chassis, Suspension, and Brakes
The 2018 and 2019 YZ450FX share the same aluminum frame, but the latter offers some updates to the suspension and brakes, further enhancing the overall riding experience.
Yamaha has introduced an updated KYB® coil spring-type fork on the 2019 YZ450FX. Despite retaining the same 12.2 inches of travel, this stiffer, more responsive fork provides improved tracking stability, better feel over ruts, and superior bump absorption.
Rear Suspension
Both models come equipped with a KYB® rear shock, but the 2019 version benefits from revised settings and an updated link system. These improvements have resulted in a more controlled and predictable rear-end movement, particularly in rough, technical sections.
The 2019 YZ450FX also features dual 19-inch front and 18-inch rear DOT-approved radial tires, while the 2018 model came with the same size front tire but a 16-inch rear tire. This change provides the 2019 model with increased stability and traction in varied conditions while keeping the rear-end agile and responsive.
As for brakes, the 2019 YZ450FX retains the same 270mm front and 245mm rear discs as its predecessor but gains an updated resin coating for improved braking performance and reduced weight.
Upon close inspection, you'll find that the 2019 YZ450FX retains many of the 2018 model's appreciated features, such as the responsive 6-speed transmission, adjustable levers, and Yamaha's renowned electrically adjustable KYB® fork dirección'île. The 2019 model also incorporates new lighter, yet stronger rims that contribute to its overall improved agility and handling.
Ultimately, both the 2018 and 2019 YZ450FX offer formidable performance, and the choice between the two often comes down to personal preferences and available budget. The 2019 model's refined engine, suspension, and brakes make it an excellent upgrade, but the 2018 model is still an exceptional dirt bike that combines class-leading performance with Yamaha's unrivaled build quality. Spend some time test riding both, and you'll undoubtedly find the perfect Yamaha YZ450FX model that speaks to your riding style and expectations.