Honda CR 125 R [2002-2007]: A Two-Stroke Motocross Legend Revisited

Introduction

The Honda CR 125 R, produced between 2002 and 2007, remains a cult favorite among motocross enthusiasts. As part of Honda’s storied CR lineage, this generation blended aggressive styling, race-bred engineering, and the raw thrill of two-stroke power into a package that still turns heads today. Whether you’re a weekend warrior or a vintage MX collector, the CR 125 R represents an era when lightweight frames and screaming engines ruled the dirt. Let’s dive into what makes this bike a timeless contender.

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Engine Performance: The Heart of a Screamer

At the core of the CR 125 R lies a liquid-cooled, single-cylinder two-stroke engine displacing 124.8–125cc. The bore and stroke (54mm x 54.5mm) are nearly square, favoring mid-range punch and throttle response over outright top-end power—a design philosophy that shines on technical tracks.

By 2005, Honda refined the carburetion with a 38mm Mikuni TMX carburetor paired with a throttle position sensor (TPS). This setup sharpened fuel delivery, especially during aggressive throttle transitions. Riders will notice the engine’s crisp response when blasting out of corners or lofting the front wheel over obstacles. The digital ignition system, introduced in later models, added three-dimensional mapping to optimize timing across RPM ranges, reducing “hits” and improving controllability.

But let’s be honest—the magic of this bike is its character. The two-stroke’s signature braaaap is accompanied by a linear powerband that rewards clutch work and precise gear changes. With a 5-speed gearbox, you’ll spend most of your time in 2nd and 3rd gears on tight tracks, though the tall 5th gear allows for relaxed cruising on open trails (top speed clocks around 120 km/h / 74.6 mph).

Key Takeaway: This isn’t a fire-breathing monster—it’s a rider’s engine. It demands skill to exploit its full potential but rewards with razor-sharp responsiveness.

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Chassis and Handling: Lightweight Agility

Honda’s aluminum twin-spar frame, introduced in 2002, was a game-changer. Weighing just 87.5–89.4 kg (192.9–197 lbs) dry, the CR 125 R feels flickable in the air and planted in ruts. The wheelbase grew slightly from 1458 mm (57.4 inches) in 2002 to 1471 mm (57.9 inches) by 2005, adding stability at speed without sacrificing cornering agility.

The cockpit is typical Honda—minimalist and functional. The seat height (947–949 mm / 37.3–37.4 inches) suits riders around 170–180 cm (5’7”–5’11”), though taller riders might find it cramped during long motos. Ground clearance (345–351 mm / 13.6–13.8 inches) is generous, letting you carve through deep ruts without dragging the frame.

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Suspension: Adjustability Meets Precision

Honda partnered with Kayaba (KYB) to equip the CR 125 R with class-leading suspension. The 46mm inverted fork offers 305–318 mm (12–12.5 inches) of travel, adjustable via 18 rebound and 20 compression clicks. Out back, the Pro-Link rear shock provides 318 mm (12.5 inches) of wheel travel with separate low/high-speed compression damping—a rarity in 125cc bikes at the time.

On the track, the setup soaks up braking bumps and landings with a plushness that borders on luxurious. Yet it remains firm enough for aggressive riders to push hard through rhythm sections. The 25.8° rake and 100 mm (3.9 inches) of trail strike a balance between quick steering and high-speed stability.

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Ride Experience: A Test Rider’s Perspective

Swinging a leg over the CR 125 R, the first thing you notice is how narrow the bike feels. The tank and seat merge seamlessly, letting you grip the frame with your knees effortlessly. Starting requires a firm kick—the CDI ignition fires up reliably, though cold starts might need a choke pull.

Acceleration is brisk but manageable. Unlike modern four-strokes, the power doesn’t overwhelm—it invites you to wring its neck. On a sandy track, the front tire (80/100-21) floats over loose terrain, while the rear (100/90-19) hooks up predictably. The Nissin brakes (single discs front and rear) lack the bite of modern setups but offer progressive feel—ideal for modulating speed mid-corner.

Over jumps, the CR 125 R shines. Its lightweight frame lets you correct mid-air mistakes with a subtle body shift. Landing from a 15-meter (49-foot) tabletop, the suspension compresses smoothly, rebounding without unsettling the chassis.

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Competition: How Does the CR 125 R Stack Up?

In the 125cc motocross arena, the CR 125 R faced fierce rivals:

1. Yamaha YZ125 (2002–2007):
   Yamaha’s two-stroke had a broader powerband and stronger top-end pull, thanks to its 5-port cylinder. However, the YZ’s steel frame felt heavier in corners compared to Honda’s aluminum chassis.

2. KTM 125 SX (2002–2007):
   KTM’s orange machine boasted cutting-edge WP suspension and a hydraulic clutch. While the KTM revved higher, its aggressive power delivery demanded more skill to harness—a trade-off for novice riders.

3. Suzuki RM125 (2002–2007):
   The RM125 prioritized low-end grunt, making it a favorite for technical tracks. Yet its Showa suspension lacked the adjustability of Honda’s KYB components.

Verdict: The CR 125 R wasn’t the most powerful, but its balanced handling and refined suspension made it the most versatile. It’s the Swiss Army knife of 125cc MX bikes.

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Maintenance: Keeping the Legend Alive

Two-strokes thrive on simplicity, but the CR 125 R demands attention in key areas:

• Premix Fuel: Always use high-quality 2-stroke oil at a 32:1 ratio for trail riding or 40:1 for racing. Synthetic oils like Motul 800 Off Road minimize carbon buildup.

• Piston Replacements: Inspect the piston every 20–30 hours. Wiseco forged pistons (available at MOTOPARTS.store) add durability for aggressive riders.

• Air Filter Care: Clean the foam filter after every ride. Consider upgrading to a Twin Air filter with a pre-filter skin for dusty conditions.

• Suspension Service: Rebuild forks and shock every 50–60 hours. MOTOPARTS.store stocks OEM KYB seals and Motorex suspension fluids.

• Carb Tuning: The Mikuni TMX can be finicky in humidity. A JD Jet Kit simplifies tuning for your local climate.

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Final Thoughts

The Honda CR 125 R [2002–2007] embodies the golden age of two-stroke motocross. It’s a bike that rewards skill, forgives mistakes, and—most importantly—makes every ride feel like a playground. While newer bikes offer more tech, the CR’s raw simplicity and razor-sharp handling keep it relevant. Whether you’re restoring a barn find or upgrading your weekend racer, MOTOPARTS.store has the OEM and aftermarket parts to keep your CR screaming for decades to come.

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Specifications sheet

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