The 2019 Yamaha YZ450FX obtained an entire overhaul for this mannequin 12 months. It shares most of the identical elements because the YZ450F motocross bike, however has a number of off-road-specific options together with a wide-ratio transmission, particularly tuned suspension, a larger-capacity gasoline tank, a newly designed composite skid plate, a redesigned aluminum kickstand, an 18-inch rear wheel, a sealed O-ring chain, and particular ECU settings designed for off-road using. The 2019 Yamaha YZ450FX doesn’t come inventory with hand guards, however Yamaha put in them on our testbike for the comparability.
2019 Yamaha YZ450FX Engine
Earlier than the shootout received underway, we mounted a Dunlop D404 road tire on the rear wheel and ran the YZ450FX on our in-house Dynojet dynamometer, the place it produced 53.24 hp at 9,430 rpm and 32.57 pound-feet of torque at 7,330 rpm. The Yamaha ranks second within the horsepower division and fourth in torque. We then mounted a contemporary set of Dunlop AT81 tires to make sure consistency in traction among the many 4 rivals via the period of the take a look at.
The YZ450FX was redesigned from the bottom up for 2019 with a brand new engine with wi-fi tuning functionality from a smartphone, an all-new body, and revised suspension settings to match the brand new chassis.Jeff Allen
The 2019 YZ450FX has a really robust engine with tractor-like torque. It has nice bottom-end, a plentiful midrange, and first rate top-end. It doesn’t have the over-rev of its competitors, but it surely pulls low rpm higher. This lets you use a better gear or a smaller rear sprocket if you wish to shift much less. The very low first gear got here in helpful on super-tight and technical trails, and required much less clutch work than the three different bikes within the take a look at in such conditions.
Weighing in at 256 kilos, the Yamaha is the second-heaviest bike within the shootout.Jeff Allen
The YZ450FX provides probably the most tunability with the Energy Tuner app and the handlebar-mounted twin map swap. The app works properly and makes very noticeable modifications to the engine’s efficiency. It’s a helpful function, particularly on 450s, because the engine’s energy supply can considerably have an effect on the chassis efficiency. Take a look at riders have been capable of mellow out the ability for low-traction areas and when using tight single-track. When coming into a wider open space of the path or the motocross monitor, they have been capable of return to the usual map with the push of a button.
The YZ450FX produces 53.24 hp at 9,430 rpm and 32.57 pound-feet of torque at 7,330 rpm.Jeff Allen
The clutch could be very per a clean pull and virtually no fade. The engine shifts easily with minimal clutch enter. The Yamaha YZ450FX has barely extra engine-braking than the opposite three bikes within the take a look at. The airbox noise is noticeable at first, however turns into regular after a couple of minutes of using. The muffler shouldn’t be as loud because the Honda’s, however not as quiet because the Husqvarna’s or KTM’s both.
The Yamaha has a really robust engine with tractor-like torque and a wide-ratio transmission.Jeff Allen
2019 Yamaha YZ450FX Suspension
Yamaha’s KYB Velocity Delicate System (SSS) fork and KYB shock are simply the most effective inventory suspension elements. They’re remarkably plush and confidence inspiring. The adjusters have a superb vary for stiffening or softening, and the spring charges really feel very balanced. The inventory settings are a contact delicate for quicker, heavier load conditions, however are very near being good for slower to medium-speed single-track. Stiffening compression on the fork and shock resulted in just a little extra hold-up on greater impacts, high-speed rollers, bounce takeoffs, and landings. This extra hold-up even helped within the smaller bumps by preserving the suspension up increased within the stroke. The Yamaha’s suspension had the most effective total efficiency on the paths and the motocross monitor.
The YZ450FX provides probably the most tunability with the Energy Tuner app and the handlebar-mounted twin map swap. The app works properly and makes very noticeable modifications to the engine’s efficiency.Jeff Allen
2019 Yamaha YZ450FX Chassis/Dealing with
The 2019 Yamaha YZ450FX weighed in at 256 kilos on our automotive scales, which makes it the second-heaviest bike within the class. It’s very secure and is probably the most planted feeling bike within the shootout. It’s not the nimblest dealing with machine and feels a contact heavier than its competitors as properly. It doesn’t flip as sharply or simply because the 2019 Honda CRF450RX or the 2 Austrian machines, but it surely corners properly, particularly for a motorcycle that leans extra towards stability.
The Yamaha YZ450FX’s ergonomics are improved for 2019. The radiator shrouds are noticeably thinner than the earlier mannequin, however are nonetheless a contact huge compared to the KTM and Husqvarna. Yamaha did a wonderful job with the bigger gasoline tank. It’s 100 p.c hidden, isn’t noticeable when using, and has little to no impact on the chassis from full to empty. The YZ450FX feels balanced with 105mm of shock sag. Some take a look at riders most popular to run much less sag—between 100mm and 102mm—to place extra weight on the entrance finish and assist cornering.
The rider place is a bit off, which largely has to do with the seat. It has a noticeable dip that may be a little too far again, stopping the rider from getting far ahead sufficient to realize most cornering efficiency. A taller seat wouldn’t solely make it simpler to remain ahead when sitting, it will additionally require much less effort to go from sitting to standing and create much less of a sit-in feeling. The handlebar additionally feels excessive in relation to the seat. A taller seat would assist this sensation as properly, however decrease bar mounts would suffice too. Additionally, we like that the 2019 YZ450FX is supplied with a skid plate however would additionally desire to see it include hand guards in inventory trim as properly.
Yamaha’s KYB Velocity Delicate System (SSS) fork and KYB shock are simply the most effective inventory suspension elements.Jeff Allen
The YZ450FX is the most effective total 450 off-road bike for all the pieces from low- to high-speed off-road using. It really works nice on the motocross monitor too. It has a robust engine with tons of torque, the most effective suspension, probably the most stability, the plushest journey, and state-of-the-art tunability.
Why It Shouldn’t Have Received
It’s considerably heavy feeling and never as nimble as the opposite bikes within the shootout. The seat-to-handlebar peak is a bit off too.
The YZ450FX is probably the most planted feeling bike within the shootout. It corners properly, particularly for a motorcycle that leans extra towards stability.Jeff Allen