2021 Honda CRF450RX - Dirt Bike Magazine

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Dirt Bike Magazine tests the 2021 Honda CRF450RX in the high desert of Southern California. We took the Honda CRF450RX through multiple styles of terrain and even found some water along the way. The CRF450RX is essentially the same motorcycle as the MX version, but with a number of off-road features:
Softer suspension: The RX has a 5.0 N/m spring in the rear and different valving. The MX bike has a 5.4. In front, the springs are 0.48 N/m as opposed to 0.50.
Mapping: The RX has three maps that can be selected through use of a handlebar switch. None of them are the same as those of the MX bike, although number three is the most aggressive and closely mimics number one on the CRF450R. As a side note, our test bike had the latest mapping update from Honda. If you have an RX, you can get the update through any Honda dealer. The RX also has three levels of traction control, all of which are different from those of the MX bike. Like the MX bike, it also has three-tiers of launch control.
Fuel capacity: The off-road bike carries 2.1 gallons, in a plastic fuel tank. The MX bike has 1.7 in a titanium tank.
Wheels and tires: The RX has an 18-inch rear wheel in back. Both ends have Dunlop AT81 tires.
Details: You get new handguards, an O-ring chain and lower final gearing (50-tooth rear sprocket vs. 49). The gearbox itself is identical on the two models.
You don’t get a spark arrester, a quiet muffler or California green-sticker certification.The biggest news in the motor department is the new head with the center-port exhaust. This leads to a single exhaust system–no more twice pipes. The intake was rethought with larger volume between the filter and the throttle body along with re-angled injectors. The motor also gets a new clutch with larger surface area and hydraulic actuation. There’s a Nissin master cylinder on the handlebar connected to a Nissin slave on the left side of the case.The Honda is going to be a big hit in GP racing. It’s fast and it handles well. The only issue it might have in that environment is soft suspension settings. Last year the RX wasn’t far from the R in terms of set up. Now it’s softer, which means it’s great for light whoops and sweeping, third-gear runs through rocky off-road trail trash. Once you transition to a track, it can be overwhelmed by big jumps and high speeds. We’re still testing the RX and the full story will appear in the April, 2021 print edition of Dirt Bike.
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