Yamaha YZ450F [2014-2017] Review: A Motocross Contender Built for Precision

Introduction

The Yamaha YZ450F needs no introduction in motocross circles. From 2014 to 2017, this generation solidified its reputation as a purpose-built race machine that balances raw power with surprisingly nimble handling. While Yamaha’s blue brigade has always been synonymous with reliability, this iteration of the YZ450F took a leap forward with refinements in fuel injection, chassis geometry, and suspension tuning. After spending a day wrestling this beast through motocross tracks and technical trails, it’s clear why this bike remains a favorite among riders who crave precision over compromise.

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Engine Performance: Controlled Fury

At the heart of the YZ450F lies a 449.7 cc liquid-cooled, single-cylinder four-stroke engine. The titanium-valved DOHC powerplant delivers a 12.5:1 compression ratio, and Yamaha’s Fuel Injection (YFI) system ensures throttle response that feels almost telepathic. Unlike carbureted rivals of its era, the Keihin 44mm throttle body eliminates bogging during hard acceleration out of corners.

The power curve is linear but assertive. Low-end torque pulls strongly from idle, making it forgiving for beginners, but the real magic happens when you wring it out to its 11,500 RPM ceiling. Mid-range punch feels like a coiled spring releasing, while the top-end doesn’t sign off abruptly—a rarity in 450-class bikes. Riders accustomed to two-strokes will appreciate the engine’s willingness to loft the front wheel with minimal clutch work, though the 5-speed gearbox demands deliberate shifts to stay in the sweet spot.

Key Specs:
- Bore x Stroke: 97.0 mm x 60.8 mm (3.8" x 2.4")
- Fuel Capacity: 7.5 liters (2.0 US gallons)
- Cooling System: Liquid (1.04-liter capacity)

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Handling and Suspension: A Dance Partner in the Dirt

Yamaha’s aluminum bilateral beam frame underwent subtle revisions during this generation, shedding weight while improving torsional rigidity. The result? A bike that carves ruts with surgical precision but remains compliant over braking bumps. At 111–112 kg (245–247 lbs) ready-to-ride, it’s not the lightest in its class, but the mass centralization makes it feel flickable mid-air.

The KYB Speed-Sensitive System (SSS) forks are the star here. With 310 mm (12.2") of travel, they absorb square-edge hits without deflecting, while the rear monoshock’s 315 mm (12.4") stroke keeps the rear planted during acceleration. Out-of-the-box settings work well for intermediate riders, but professionals will appreciate the 22-click adjustability for fine-tuning sag and rebound.

Geometry Highlights:
- Rake Angle: 28° (27.5° on the 2016 Anniversary model)
- Wheelbase: 1,481–1,495 mm (58.3–58.9")
- Ground Clearance: 335–386 mm (13.2–15.2")

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Ergonomics: Tall, But Manageable

The YZ450F’s seat height—965–975 mm (38.0–38.4")—is intimidating for shorter riders, but the narrow frame design helps. Standing up feels natural thanks to a flat, two-tone seat and well-positioned footpegs. The handlebars offer a neutral bend, reducing arm pump during long motos.

One gripe? The kickstarter (on pre-2015 models) requires a committed stomp, though Yamaha introduced electric start in later years. Fuel range is typical for the class: 7.5 liters (2.0 gallons) lasts about 1.5 hours of aggressive riding.

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Competition: How It Stacks Up

1. Honda CRF450R

• Strengths: Smoother power delivery, lighter feel.
• Weaknesses: Less mid-range punch; air fork lacks KYB’s plushness.
• YZ Edge: Yamaha’s YFI system offers crisper throttle response.

2. KTM 450 SX-F

• Strengths: Lighter weight (108 kg/238 lbs), hydraulic clutch.
• Weaknesses: Stiffer suspension for novice riders.
• YZ Edge: More predictable handling in deep ruts.

3. Kawasaki KX450F

• Strengths: Strong low-end torque, ergonomic comfort.
• Weaknesses: Heavier feel in tight corners.
• YZ Edge: Yamaha’s SSS forks outperform Showa’s conventional setup.

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Maintenance: Keeping the Beast Alive

Owners praise the YZ450F’s reliability, but neglect is its kryptonite. Here’s how to keep it race-ready:

1. Oil Changes

• Frequency: Every 10–15 hours (or 3–4 rides).
• Oil Type: 10W-30 to 20W-50 (API SG+). Capacity: 690 ml with filter.
• Pro Tip: Use a magnetic drain plug to catch metal shavings.

2. Valve Adjustments

• Intake Clearance: 0.13–0.20 mm (0.005–0.008").
• Exhaust Clearance: 0.20–0.25 mm (0.008–0.010").
• Check Interval: Every 30 hours. Titanium valves hold spec longer than steel.

3. Chain and Sprockets

• Stock Setup: 13/49 teeth with 114-link 520 chain.
• Upgrade Path: Swap to a DID ERT2 chain for longevity.

4. Cooling System

• Coolant Type: Ethylene glycol mix (1.04-liter capacity).
• Watch For: Overheating in slow technical sections—consider a high-pressure radiator cap.

5. Brakes

• Fluid: DOT 4. Bleed annually or after hard crashes.

MOTOPARTS.store Recommendations:
- NGK CR8EIX iridium spark plugs for consistent ignition.
- Aftermarket air filters (Twin Air) for dusty conditions.
- Heavy-duty skid plates to protect the engine casing.

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Final Verdict

The 2014–2017 Yamaha YZ450F isn’t just a bike—it’s a statement. While newer models have since adopted electric starters and connectivity features, this generation remains a benchmark for riders who value mechanical purity. Its engine thrills without terrifying, its suspension forgives mid-corner mistakes, and its durability makes it a used-market gem. Whether you’re battling for holeshots or honing your skills, this YZ450F generation proves that sometimes, evolution beats revolution.

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Specifications sheet

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