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Description
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Engineering
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HRC Launch Control
We’re talking about a special ECU program here: push the button to select the mode, hold the throttle open, release the clutch, and the CRF450RX will do the rest, launching you into the first turn with a big advantage. It turns your bike into a holeshot-seeking machine!
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DOHC Engine Layout
The CRF250R uses a double-overhead-cam (DOHC) engine layout with a unique finger-follower rocker design. Together with the rest of the engine’s architecture (bore and stroke, intake tract, piston, and more), you get more power and a higher redline.
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Electric Start
The CRF250R is equipped with an effortless electric starter. Convenient and lightweight, it’s a huge deal if you need to restart a stalled bike in the heat of battle.
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New Gear-Position Engine Mapping
Talk about smart: The CRF250R now features an ECU with special engine mapping for each gear. You can’t give an inch in this class, so having your engine deliver optimal power for each gear choice is one of the features that separates CRF250R riders from the rest.
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Engine Mode Select Button
This simple handlebar-mounted button lets you dial in engine power delivery character with a push of your thumb. Choose between Standard, Smooth and Aggressive, depending on track conditions.
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Titanium Intake and Exhaust Valves
Light is right when it comes to a high-revving engine’s reciprocating masses. That’s why the CRF250R uses titanium intake and exhaust valves. Plus, the valve angle is a super-narrow 20.5 degrees (included). Ovalized valve springs and long-wearing Diamond-Like Carbon (DLC) treated finger rockers complete the package.
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Downdraft Intake and Exhaust Layout
The DOHC cylinder-head design let our engineers straighten out the CRF250R’s intake and exhaust tracts. The intake is shorter and just about arrow straight, and the exhaust flows more efficiently too. No athlete’s going to win a sprint if they try to run while holding their breath, and it’s no different with your bike’s engine. You’ll experience both more power and better throttle response.
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Big Bore/Short Stroke
The CRF250R’s 79 mm bore and short 50.9 mm stroke let our engineers create a high-revving engine with plenty of room for large valves. The engine breathes and revs—the two keys to making power in the motocross world.
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Dual-Exhaust System
The CRF250R’s dual-exhaust system is light, compact, and positioned close and low in the frame to take weight off the rear end and bring more mass to the bike’s center for improved handling. It also allows for more airflow, and that equals added power.
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Total Air Management
Total air management means complete attention to how efficiently air gets through the intake, through the head, and out the exhaust. Eliminate losses here, and you make more power everywhere. And the best part? It’s free power—you just need a bike with smart design.
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Bridged-Box Piston
A first for a Honda MX bike, the CRF250R features a bridged-box piston design developed on our factory racebikes. Why? The reinforcing structure between the skirts and the wrist-pin bosses lets this big-bore piston retain a light, strong construction and helps enable the CRF250R’s high redline.
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Performance
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New 2019 Cam Profiles
With input directly from our HRC works team, we’ve changed the cam profiles on our 2019 model. You should feel the engine rev more freely, as well as improved torque feel in the bottom end.
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New Throttle Body
With a 2 mm smaller venturi designed to speed up airflow, the CRF250R’s new throttle body really reaps benefits at low engine operating speeds. You get power and snap, right now.
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Large Valve Diameters
The CRF250R’s valves don’t just have impressive lift, the valves themselves are large-diameter too—33 mm intakes and 26 mm exhausts. Combined with the high lift, the twin-cam CRF250R flows a lot more, especially at high revs when you’re wicking it up.
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New Double-Spray Injector Settings
The CRF250R’s fuel-injection system sprays twice per intake cycle. That helps increase fuel atomization without adding the weight or complexity of a second injector. The better fuel atomization means more power in the midrange and on over rev—you’ll feel it the first time you race.
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High Redline
With our better-breathing DOHC design and the big-bore/short-stroke engine, the CRF250R’s rev limit is way impressive. The same goes for peak power and peak torque.
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Cylinder Head Layout
The CRF450RX uses our latest finger-follower rocker design. The Unicam cylinder head remains one of the most efficient in the off-road world, giving you the design and performance of a double-overhead-cam layout but the compactness of a single-overhead-cam design.
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More Power
With the power updates for 2019, feel free to hold that throttle open and head for the first turn—the CRF250R is designed to win that critical holeshot drag race as well as increased low-end torque.
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Comfort & Handling
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Showa Spring Fork
The 49 mm Showa fork features a conventional spring design that helps increase the CRF250R’s front-suspension precision, handling and feel. The 39 mm piston diameter and 25 mm rod diameter guarantee a plush feel and supple action.
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Low Rear Shock Mount
With its low rear shock mount on the frame, the CRF250R benefits from both a lower center of gravity (cg) as well as chassis stability.
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Short Swingarm
The CRF250R’s short swingarm helps make it light, and also helps give the bike better rear-wheel traction, important considering how much power you have on tap. The design also reduces the bike’s unsprung mass.
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Dunlop MX3S Tires
Developed using Dunlop’s latest “block-on-block” design technology, the CRF250R’s MX3S tires give excellent feedback and are a perfect complement to the CRF250R’s frame and suspension.
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Smooth Styling
Blending the CRF250R’s body panels does more than just make the bike look smooth, fast, and stylish. It also helps you move around on the bike while riding. Nothing wrong with smooth, fast, and stylish, though.
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