Yamaha YZ250 [2005-2016] Review: The Last Great Two-Stroke Warrior

Introduction

The Yamaha YZ250 needs no introduction in motocross circles. From 2005 to 2016, this two-stroke icon defied the industry’s shift toward four-strokes, carving its legacy as a lightweight, adrenaline-pumping machine that refuses to become obsolete. While other manufacturers abandoned smoker technology, Yamaha refined it—delivering a bike that’s both raw and remarkably polished. After a full day of ripping through berms and testing its limits on MX tracks, one thing becomes clear: this isn’t just a relic; it’s a benchmark.

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Engine and Performance

The Heart of a Rebel

At the core of the YZ250 beats a 249cc liquid-cooled two-stroke engine—a 66.4mm x 72.0mm bore/stroke configuration that’s remained largely unchanged for over a decade. Why? Because it works. The Keihin PWK38S carburetor (a favorite among tuners) delivers crisp throttle response, while the 8.9:1 to 9.2:1 compression ratios (varies by year) strike a balance between tractable low-end and a ferocious top-end hit.

Key Highlights:
- Power Delivery: Roll the throttle gently, and it chugs like a tractor through technical sections. Snap it open, and the YZ250 transforms—the front wheel claws at the sky as the powerband erupts around 7,000 RPM.
- 5-Speed Transmission: Durable and precise. Third gear is the sweet spot for rhythm sections, while fifth lets you chase down 450Fs on straights (briefly!).
- Weight Advantage: At 96-103 kg (212-227 lbs) wet, it’s 20-25% lighter than modern four-strokes. You feel it when whipping through whoops or correcting mid-air.

Test Ride Verdict: The engine isn’t just powerful—it’s communicative. You’ll learn to "ride the pipe," using clutch flicks to keep it singing in its happy zone. Purists will love the kickstart ritual; electric starters arrived only on later models (2011+), but the classic kick adds to the raw charm.

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Handling and Suspension

A Dance Partner That Never Misses a Beat

Yamaha’s aluminum bilateral beam frame (2005-2009) evolved into a semi-double cradle design by 2016, shaving weight and sharpening turn-in. Paired with a 1,481mm (58.3") wheelbase and 26-28° rake angles, the YZ250 carves ruts like a surgeon.

Suspension Breakdown:
- Front: 48mm KYB Speed-Sensitive System (SSS) forks (300mm/11.8" travel) dominate post-2008 models. They eat up braking bumps yet stay composed during hard landings.
- Rear: The fully adjustable KYB shock (315mm/12.4" travel) features separate high/low-speed compression adjusters. Dial in 105mm sag, and the rear tracks like a rail.

On the Track:
- Cornering: The 80/100-21 front tire bites into loose soil, while the 110/90-19 rear hooks up predictably. Lean it over, and the bike flicks sideways with minimal input.
- Jumping: At 381mm (15") ground clearance, casing a landing is rare. The balanced weight distribution makes seat bouncing effortless.

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Brakes and Wheels

Controlled Aggression

The single 245mm discs (front/rear) won’t win awards for innovation, but they’re effective. Nissin calipers offer progressive bite—ideal for modulating speed in slick conditions. Upgrade to sintered pads (available at MOTOPARTS.store) for harder stops.

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Ergonomics and Comfort

Built for Attack

At 993mm (39.1") seat height, the YZ250 suits riders 5'6" and up. The narrow aluminum frame lets you grip with your knees, while the handlebar bend (close to Renthal 971) encourages an aggressive stance. Fuel range? About 40-50km (25-30 miles) per 8L (2.1-gallon) tank—enough for a moto, not a desert race.

Gripes: The hard seat foam punishes beginners on long sessions. Swap it for an aftermarket unit if trail riding.

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Competition

How the YZ250 Stacks Up

1. KTM 250 SX (2005-2016)
2. Pros: Lighter (94kg/207lbs), hydraulic clutch, sharper turning.
3. Cons: Harsher suspension, less reliable bottom end.

4. Verdict: The KTM is wilder; the YZ250 is more refined.

5. Honda CR250R (2005-2007)

6. Pros: Legendary chassis, smoother power.
7. Cons: Case-reed engine lacks Yamaha’s top-end scream.

8. Verdict: Honda’s last CR250R feels dated compared to the YZ’s SSS forks.

9. Kawasaki KX250 (2005-2008)

10. Pros: Aggressive mid-range hit.
11. Cons: Heavier steering, weaker brakes.
12. Verdict: The KX appeals to thrill-seekers; the YZ rewards precision.

Yamaha’s Edge: Unmatched suspension out of the crate and a vast aftermarket. While KTMs demand constant tuning, the YZ250 works everywhere from amateur tracks to Pro circuits.

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Maintenance

Keeping the Beast Alive

1. Premix Wisdom
- Oil Ratio: 32:1 for racing, 40:1 for trail riding. Use synthetic oils like Motul 800.
- Carb Tuning: The stock 2.25-turn air screw setting works for sea level. At altitude, lean it to 1.75.

2. Top-End Rebuilds
- Frequency: Every 30-50 hours (racing) or 100+ hours (recreational).
- Pro Tip: Install a Vertex piston kit (available here) for OEM reliability.

3. Suspension Servicing
- Forks: Change oil every 40 hours. Stick with 335-340cc per leg for MX.
- Shock: Rebuild every 100 hours. Check nitrogen pressure (142 psi).

4. Chain & Sprockets
- Stock Gearing: 14/50. Go +1 tooth rear for tighter tracks.
- Upgrade: DID 520ERT2 chain and aluminum sprockets reduce unsprung weight.

5. Cooling System
- Fluid: Engine Ice coolant prevents boil-overs during summer motos.
- Check: Inspect radiator fins for mud clogging after every ride.

MOTOPARTS.store Recommendations:
- NGK BR8EG Spark Plugs (stock replacement)
- Tusk D-Flex Handguards (for trail protection)
- Hinson Clutch Basket (if stock notching appears)

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Conclusion

The 2005-2016 Yamaha YZ250 isn’t just a motorcycle—it’s a statement. In an era of turbocharged four-strokes and traction control, this two-stroke reminds us why riding should be visceral, unfiltered, and demanding. It rewards skill, punishes laziness, and above all, never fails to put a grin under your helmet. Whether you’re chasing holeshots or vintage glory, the YZ250 remains a masterpiece of analog aggression.

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Specifikacijų lentelė

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