Honda CRF250R (2018-2021): The Refined Motocross Warrior

Introduction

The Honda CRF250R needs no introduction in motocross circles. Between 2018 and 2021, this machine solidified its reputation as one of the most balanced 250cc four-stroke dirt bikes ever built. While its crimson plastics remain unmistakably Honda, it’s the engineering beneath that makes this generation stand out. After throwing a leg over a well-maintained 2020 model, I discovered why this bike continues to be a favorite among amateur racers and weekend warriors alike – even years after its release.

Engine Performance: Precision Meets Punch

At the heart of the CRF250R lies a 249cc liquid-cooled single-cylinder engine that’s all business. The 79mm bore and 50.9mm stroke (3.1" x 2.0") work with a sky-high 13.9:1 compression ratio to deliver 40 PS (29 kW) – numbers that translate to instant arm-tugging response. What surprised me most wasn’t the peak power, but how Honda’s Dual-Timing PGM-FI fuel injection manages the power curve. The 46mm throttle body (44mm in later models) feeds precise fuel mixtures, creating a tractable low-end that builds linearly rather than hitting like an on/off switch.

The electric start (a godsend after stall situations) wakes up an engine that pulls cleanly from 2,000 rpm idle to its screaming top end. Through five closely spaced gears, I found myself carrying third gear through berms that would require second on competitors’ bikes. The hydraulic clutch (a multi-plate wet design) offers buttery modulation, crucial when navigating technical sections between jumps.

Chassis & Handling: Cornering Precision Redefined

Honda’s aluminum twin-spar frame weighs just 18.4 kg (40.6 lbs) but feels infinitely rigid when pushed hard. Paired with a 1,481mm (58.3") wheelbase and 27.2° rake, the CRF carves inside lines with almost telepathic response. During my test, the 828mm (32.6") width allowed knee-out cornering that scraped boot soles without ever feeling twitchy.

Standing at 960mm (37.8"), the seat height intimidates shorter riders initially, but the narrow midsection lets even 5'7" riders dab comfortably. At 107.5 kg (237 lbs) wet, it’s not the absolute lightest in class, but the mass centralization makes it feel 10kg lighter mid-air. The Dunlop Geomax MX3S tires (80/100-21 front, 100/90-19 rear) offered predictable slide control in dry conditions, though serious mud riders might want taller knobs.

Suspension & Brakes: Showa’s Masterclass

The 49mm Showa Separate Function Fork (SFF) up front delivers 305mm (12") of travel with a distinct personality. Unlike some air forks that feel vague, these coil-spring units tracked through braking bumps with the composure of a works bike. Out back, the Pro-Link Showa shock’s 315mm (12.4") travel absorbed hard landings while maintaining rear wheel traction on exit.

Braking is handled by a 240mm front disc with dual-piston Nissin caliper and 220mm rear rotor. While not as bitey as some European setups, the progressive feel inspires confidence when scrubbing speed before tight corners. I never experienced fade during a 15-minute moto simulation, though aggressive riders might benefit from aftermarket pads.

Electronics & Ergonomics: Modern Touches

Honda’s launch control (2019 onward) is a hidden gem – hold the button while stopped, and the ECU limits revs to 8,000 rpm for perfect starts. Combined with selectable engine maps (Standard/Smooth/Aggressive), it lets riders adapt to track conditions without mechanical tweaks. The lithium-ion battery saves crucial weight and survived multiple cold starts during my testing.

The handlebar bend strikes a perfect medium between attack positioning and comfort. Gripper seat material keeps you planted during acceleration, though some testers added aftermarket foam for marathon sessions. All controls fall readily to hand, with a kill switch placement that’s intuitive during panic dismounts.

Competition: How It Stacks Up

Yamaha YZ250F

Yamaha’s reverse cylinder design offers marginally better mass centralization, making the YZ250F feel slightly nimbler mid-corner. However, the CRF counters with more linear power delivery – crucial for less experienced riders. Yamaha’s suspension setup tends to be stiffer stock, requiring more tuning for varied rider weights.

KTM 250 SX-F

The Austrian contender boasts a 5kg (11 lb) weight advantage and WP suspension that’s plusher out of the box. But KTM’s aggressive power hit demands precise throttle control, whereas the Honda is more forgiving on slippery tracks. Maintenance intervals also favor the CRF, especially regarding valve adjustments.

Kawasaki KX250

Kawasaki’s Showa suspension is comparable, but the KX’s motor character differs – stronger mid-range at the expense of over-rev. The CRF’s narrower ergonomics give it an edge in rider movement, though Kawasaki’s handlebar position suits taller pilots better.

Maintenance: Keeping Your CRF Competition-Ready

Oil & Filter

Honda specifies SAE 10W-30 (1.1L with filter change). Given the high-revving nature, consider changing every 10 engine hours. MOTOPARTS.store offers high-performance alternatives like Motul 300V 10W-40 for extreme conditions.

Air Filter

The twin-air foam filter needs cleaning after every ride. Our ProX pre-oiled filters save 15 minutes per service – crucial during race weekends.

Valve Checks

With titanium valves (intake 0.08-0.14mm / 0.003-0.006", exhaust 0.16-0.22mm / 0.006-0.009"), check clearance every 25 hours. Shimming is straightforward thanks to the Unicam design.

Chain & Sprockets

The 520 chain (116-114 links depending on year) lasts longer with proper 1.0 bar (14.5 psi) tire pressures. Upgrade to a DID ERV3 chain and steel sprockets for harsh conditions.

Cooling System

Use ethylene glycol coolant and check the 1.0L capacity annually. A Boyesen Supercooler water pump from our store can lower temps by 12°C.

Brake Maintenance

DOT 4 fluid should be bled every 30 hours. Consider Galfer braided lines for improved lever feel during long motos.

The Verdict: Timeless Capability

Three years after its final model year, the 2018-2021 CRF250R remains relevant because it nails the fundamentals. The engine excites without intimidating, the chassis forgives while still rewarding skill, and the reliability makes it a practical choice for privateers. Whether you’re chasing holeshots or trailhead bragging rights, this Honda delivers a grin-inducing experience that stands the test of time.

For riders looking to personalize their CRF250R, MOTOPARTS.store carries everything from performance exhausts to grippy footpegs – because even the best stock bike deserves your personal touch.

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Specifications sheet

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