Yamaha YZ450F (2006) Review: A Motocross Legend Revisited

Introduction

The Yamaha YZ450F needs no introduction to motocross enthusiasts. As we throw a leg over this 2006 model, it’s immediately clear why this bike became a benchmark in the 450cc class. Designed for riders who demand precision, power, and durability, the YZ450F from 2006 remains a compelling machine even by modern standards. Let’s dissect what makes this motocross weapon tick – from its thunderous engine to its track-ready chassis – and explore why it still deserves attention nearly two decades after its release.

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Design & Chassis: Built for Battle

The YZ450F’s aggressive stance screams purpose. With a 1495mm (58.9") wheelbase and dry weight of 99.8kg (220lbs), it strikes a balance between stability and flickability. The aluminum frame feels rigid yet communicative, translating track conditions without beating up the rider.

Ergonomics are classic motocross – narrow at the knees with a 998mm (39.3") seat height that’s manageable for intermediate riders but still allows taller pilots to move freely. The 373mm (14.7") ground clearance devours ruts and whoops, while the 7L (1.85gal) fuel tank reminds us this is strictly a closed-course weapon.

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Engine Performance: Carbureted Fury

At the heart beats Yamaha’s 449cc liquid-cooled DOHC four-stroke. The Keihin FCR37 carburetor delivers crisp throttle response – twist the grip and feel the 12.3:1 compression ratio shove you forward with linear urgency. Power builds from a tractable low-end into a meaty midrange that pulls hard through to the 11,000rpm limiter.

The 5-speed transmission ratios are perfectly spaced for motocross use. While modern bikes have migrated to 6-speeds, the YZ’s gearbox never leaves you hunting for the right cog. The wet multi-disc clutch handles abuse well, though aggressive riders might crave more progressive engagement.

Cold starts demand respect – the kickstarter requires a committed technique. Once warm, it fires up eagerly, emitting that signature four-stroke bark through the stock exhaust.

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Handling & Suspension: Track Scalpel

Yamaha’s KYB suspension package shines here. The 48mm upside-down forks offer 300mm (11.8") of travel, swallowing braking bumps and big jumps with equal composure. Out back, the linked-type monocross shock provides 125mm (4.9") rear wheel travel, maintaining traction even when hammering through choppy exits.

Tire choice matters – the 80/90-21 front and 110/90-19 rear combo provides predictable slide control. The 245mm front brake rotor offers strong initial bite, though serious racers might upgrade pads for fade resistance during long motos.

In rhythm sections, the YZ feels planted yet agile. It rails berms with authority but remains nimble enough for last-minute line changes. The dry weight distribution makes lifting the front over obstacles almost intuitive.

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Competition: How It Stacks Up

The 2006 YZ450F faced fierce rivals:

1. Honda CRF450R:
2. More abrupt power delivery
3. Lighter feel at speed

4. Less forgiving suspension on hard landings

5. Kawasaki KX450F:

6. Broader powerband
7. Heavier steering input

8. Faster clutch wear

9. Suzuki RM-Z450:

10. Sharper cornering
11. Less stable at high speed
12. More frequent valve adjustments

The Yamaha carved its niche with reliability and balanced performance. While not the outright leader in any single category, its across-the-board competence made it a favorite for riders needing a bike that could handle practice days and podium chases with equal grit.

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Maintenance: Keeping the Beast Alive

As MOTOPARTS.store journalists, we’ve seen what keeps these bikes competitive:

1. Air Filter Maintenance
2. Clean every 2-3 rides with no-toil filter oil

3. Upgrade to twin-air foam for better particle trapping

4. Oil Changes

5. 600ml capacity (dry sump system)

6. Use 10W-40 synthetic blend every 5 engine hours

7. Valve Checks

8. Shim-under-bucket design stays in spec longer than rivals

9. Check clearance every 25hrs

10. Suspension Refresh

11. Replace fork oil every 30hrs

12. MOTOPARTS.store offers OEM KYB seal kits

13. Drive Components

14. DID 520 chain lasts 15% longer than competitors
15. Swap sprockets as a set to prevent accelerated wear

Pro Tip: Install a hour meter – these engines thrive on scheduled care.

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Conclusion: Timeless MX Warrior

The 2006 YZ450F isn’t just nostalgia – it’s a reminder of how Yamaha nailed the formula for a competitive 450. While modern bikes boast fuel injection and launch control, this carbureted brute rewards skilled riders with raw, unadulterated performance. Whether you’re rebuilding a classic or chasing vintage series glory, this Yamaha remains a platform that responds beautifully to upgrades.

At MOTOPARTS.store, we keep these legends track-ready. From OEM replacement parts to performance mods that wake up the 16-year-old beast within, everything you need is just a click away. Ride hard, maintain smart, and let this blue warrior remind you why simple, focused motocross bikes never go out of style.

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Specifications sheet

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