Honda CR 85 R [2003-2007]: A Two-Stroke Motocross Legend Revisited

Introduction

The Honda CR 85 R, produced between 2003 and 2007, remains a cornerstone of entry-level motocross racing. Designed as a bridge between junior and adult-sized dirt bikes, this two-stroke machine carved its reputation with a blend of lightweight agility, punchy power delivery, and Honda’s trademark reliability. Over its production run, Honda offered two variants: the standard CR 85 R and the CR 85 R Expert, the latter featuring larger wheels, a taller seat, and longer suspension travel for older or taller riders.

Having recently thrown a leg over a meticulously maintained 2006 CR 85 R Expert, it’s clear why this bike still has a cult following. From its razor-sharp handling to its screaming two-stroke engine, the CR 85 R feels like a time capsule of an era when simplicity and raw performance ruled the pits. Let’s dive into what makes this bike tick—and why it still deserves attention from riders and tuners today.

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Engine Performance: The Heart of a Pocket Rocket

At the core of the CR 85 R is a liquid-cooled, single-cylinder two-stroke engine displacing 84.7cc. With a bore and stroke of 47.5mm x 47.8mm, this powerplant is all about high-revving excitement. The 38mm Mikuni TMX carburetor (equipped with a throttle position sensor on later models) ensures crisp throttle response, while the 6-speed transmission lets riders exploit every ounce of power across varied terrain.

Power Delivery & Riding Experience

Twist the throttle, and the CR 85 R erupts with the classic two-stroke hit—a sudden surge of power that arrives around 7,000 RPM and pulls hard to its 11,500 RPM redline. The engine’s character is unapologetically aggressive, demanding precise clutch control and body positioning to keep the front wheel grounded. On tight tracks, the bike feels explosive, but it rewards skilled riders with blistering acceleration out of corners.

The six-speed gearbox is a standout feature. Unlike many 85cc bikes limited to five gears, the CR’s extra cog allows tighter spacing between ratios, making it easier to stay in the meat of the powerband. Shifts are precise, though the clutch can feel stiff for younger riders—a common critique that’s easily addressed with aftermarket clutch springs (more on that later).

Cooling & Reliability

Liquid cooling keeps temperatures in check during motos, a critical advantage over air-cooled competitors. The engine’s 8.4:1 compression ratio strikes a balance between performance and reliability, though regular top-end rebuilds are a fact of life with any high-strung two-stroke. Pro tip: Pairing Honda’s OEM piston kits with a high-quality synthetic oil (like Motul 800) can extend rebuild intervals.

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Chassis & Handling: Precision Meets Playfulness

The CR 85 R’s chassis is a masterclass in minimalist design. The aluminum frame weighs just 65.3 kg (144 lbs) on the standard model, while the Expert variant tips the scales at 65.8 kg (145 lbs). That featherweight feel translates to effortless flickability through rhythm sections and whoops.

Suspension Setup

Both models feature fully adjustable Showa suspension, but the Expert variant adds longer travel: - Standard CR 85 R: 274 mm (10.8 in) front and rear wheel travel.
- Expert CR 85 R: 274 mm (10.8 in) front / 292 mm (11.5 in) rear.

The Expert’s suspension is tuned for heavier riders and bigger jumps, with a stiffer spring rate and revised damping. During my test ride, the Expert soaked up hard landings with confidence, while the standard model felt more suited to lighter riders on technical tracks. The 37mm inverted Showa fork provides excellent feedback, though older units may benefit from a seal refresh—a common maintenance task we’ll cover later.

Ergonomics & Comfort

Seat height varies significantly between models: - Standard: 823 mm (32.4 in)
- Expert: 864 mm (34.0 in)

The Expert’s taller perch suits riders approaching 160 cm (5’3”), while the standard model accommodates shorter inseams. Both bikes feature narrow midsections for easy leg grip, though the handlebar bend feels dated by modern standards. Swapping to a Renthal FatBar (available at MOTOPARTS.store) improves leverage and comfort.

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Brakes, Wheels & Tires: Stopping Power Meets Grip

Honda equipped the CR 85 R with single disc brakes front and rear. While not as powerful as today’s four-piston calipers, the Nissin units provide ample stopping force for a sub-70 kg machine. The front 70/90-17 tire (standard) or 70/70-19 (Expert) offers predictable bite in loose soil, though upgrading to a modern intermediate tire (like Dunlop MX33) enhances cornering confidence.

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Competition: How the CR 85 R Stacks Up

The CR 85 R faced fierce rivals in the 85cc class. Here’s how it compared:

1. Kawasaki KX85

• Engine: Similar two-stroke setup but with a broader powerband.
• Suspension: Less adjustable than Showa components on the Honda.
• Verdict: The KX85 is friendlier to beginners, but the CR 85 R’s precise handling wins on technical tracks.

2. Yamaha YZ85

• Engine: More mid-range torque but less peak power.
• Transmission: 6-speed like the Honda, but heavier clutch pull.
• Verdict: The YZ85 is a better all-rounder, but the CR 85 R dominates in outright aggression.

3. Suzuki RM85

• Handling: Sharper turn-in but twitchy at high speeds.
• Reliability: More frequent top-end rebuilds than the Honda.
• Verdict: The RM85 is a wildcard for aggressive riders; the CR 85 R offers better longevity.

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Maintenance: Keeping Your CR 85 R in Peak Condition

Owning a two-stroke motocross bike requires diligence. Here’s your CR 85 R maintenance cheat sheet:

1. Top-End Rebuilds

• Replace pistons every 15-20 hours of hard riding.
• Upgrade Tip: MOTOPARTS.store offers forged pistons for improved durability.

2. Carburetor Tuning

• Clean the Mikuni TMX every 10 hours. Use a TPS-compatible cleaner to avoid sensor damage.
• Jet Kit Recommendation: JD Jetting’s CR85-specific kit resolves lean spots at altitude.

3. Suspension Service

• Replace fork oil annually. The Expert’s Showa shock benefits from a nitrogen recharge every 30 hours.
• Upgrade: Progressive-rate springs improve bottoming resistance.

4. Air Filter Care

• Clean with biodegradable solvent after every ride.
• Pro Tip: Twin Air filters (available here) offer superior filtration.

5. Chain & Sprockets

• Replace worn sprockets with DID X-Ring chain kits for longer life.

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Final Verdict: Why the CR 85 R Still Matters

The Honda CR 85 R isn’t just a relic—it’s a testament to an era when two-strokes ruled the dirt. Its combination of explosive power, razor-sharp handling, and bulletproof reliability makes it a favorite for riders seeking a "pure" motocross experience. While modern four-strokes dominate today’s starting gates, the CR 85 R remains a cost-effective entry point for aspiring racers and a blank canvas for tuners.

Whether you’re rebuilding a barn find or prepping for vintage race days, MOTOPARTS.store has the OEM and aftermarket components to keep your CR 85 R alive and screaming. From piston kits to suspension upgrades, we’ve got your back—because legends deserve to stay on the track.

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Specifications sheet

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