Grant Langston puts the 2019 and 2020 Yamaha YZ450F head-to-head to reveal key differences in power, suspension, ergonomics, and overall ride feel. This guide breaks down every major change so you can decide which model suits your riding style best.
Key Takeaways
- All-new engine in 2020: The 2020 YZ450F features a lighter, more responsive engine with improved low-end torque and smoother power delivery compared to the 2019 model.
- Redesigned chassis and suspension: Yamaha updated the frame, swingarm, and KYB SSS fork in 2020 for better balance, cornering, and bump absorption.
- Electric start standard: Unlike the kick-start-only 2019 model, the 2020 YZ450F comes with electric start—a major convenience upgrade.
- Improved ergonomics: The 2020 bike has a slimmer fuel tank, revised seat shape, and repositioned handlebars for better rider control and comfort.
- Better throttle response: The 2020 model’s updated fuel injection mapping gives crisper throttle response and easier low-speed control.
- Weight reduction: Despite added features, the 2020 YZ450F is slightly lighter, improving agility and handling.
- Same legendary reliability: Both models retain Yamaha’s reputation for durability, but the 2020 offers a more refined, race-ready package.
Introduction: Why This Comparison Matters
If you’re in the market for a high-performance 450cc motocross bike, the Yamaha YZ450F is a top contender. But with major updates between the 2019 and 2020 model years, choosing the right one can be tricky. That’s where professional rider and former AMA champion Grant Langston comes in. He’s ridden both bikes extensively and offers real-world insights into how they stack up.
In this guide, you’ll learn exactly what changed from 2019 to 2020, how those changes affect ride quality, and which model might be better for your style—whether you’re racing, trail riding, or just chasing peak performance. We’ll break down engine performance, suspension, handling, ergonomics, and more, using Langston’s expert feedback to help you make an informed decision.
Engine and Power Delivery: The Heart of the Difference
The most significant upgrade in the 2020 YZ450F is its completely redesigned engine. Yamaha didn’t just tweak the 2019 motor—they rebuilt it from the ground up.
2019 YZ450F Engine Overview
The 2019 model featured a 449cc liquid-cooled, four-stroke engine with a rearward-inclined cylinder and fuel injection. It delivered strong top-end power but could feel snappy and hard to manage at low RPMs. Riders often had to work the clutch and throttle carefully to avoid stalling or wheelspin.
2020 YZ450F Engine Upgrades
The 2020 engine is lighter, more compact, and tuned for better low-to-mid-range torque. Key changes include:
- A new cylinder head with revised porting and combustion chamber shape
- Thinner piston rings and a lighter piston for reduced friction
- Updated camshaft profiles for smoother power delivery
- Revised fuel injection mapping for crisper throttle response
According to Grant Langston, “The 2020 engine feels more connected. You can roll on the throttle earlier out of corners without fear of spinning the rear wheel. It’s more forgiving but still packs a punch when you need it.”
Real-World Power Feel
On the track, the 2020 model launches harder off the line and pulls stronger through the mid-range. The 2019 still has a thrilling top-end rush, but it requires more rider input to manage. For most riders—especially those not racing at elite levels—the 2020’s smoother power band is a big advantage.
Chassis and Suspension: Handling the Bumps
Yamaha didn’t stop at the engine. The 2020 YZ450F received a full chassis overhaul to improve stability, cornering, and bump absorption.
Frame and Swingarm Changes
The 2020 frame is lighter and more rigid, with revised geometry for better balance. The swingarm is also new—shorter and stiffer—which helps with rear-wheel traction and responsiveness.
KYB SSS Fork Updates
Both years use KYB’s SSS (Speed Sensitive System) forks, but the 2020 version has updated valving and spring rates. Langston notes, “The 2020 fork feels more planted in whoops and doesn’t dive as much under hard braking. It’s more predictable.”
Rear Shock Improvements
The rear shock on the 2020 model has a new linkage ratio and damping settings. This results in better small-bump sensitivity and improved traction over rough terrain.
Test Ride Comparison
When Langston rode both bikes back-to-back on a technical track, he found the 2020 YZ450F cornered tighter and felt more stable at speed. The 2019 still handles well, but it requires more rider correction—especially in loose or bumpy conditions.
Ergonomics and Rider Comfort: Sitting in the Saddle
Rider comfort might not seem like a performance factor, but on a 450cc motocross bike, it absolutely is. Fatigue leads to mistakes, and mistakes cost time.
Fuel Tank and Seat Design
The 2020 YZ450F features a slimmer, reshaped fuel tank that makes it easier to grip with your knees. The seat is also narrower at the front and slightly longer, improving control during aggressive riding.
Handlebar Position and Controls
Yamaha repositioned the handlebars on the 2020 model—slightly higher and closer to the rider. This reduces strain on the shoulders and gives better leverage in corners. The controls are also more intuitive, with a revised switch layout.
Electric Start: A Game-Changer
One of the biggest quality-of-life upgrades is the addition of electric start on the 2020 model. The 2019 YZ450F is kick-start only—a reliable system, but not ideal after a crash or when you’re tired.
Langston says, “After a hard moto, being able to just hit the button and go is huge. It’s not just convenience—it’s confidence.”
Weight and Balance: Lighter and Sharper
Despite adding features like electric start, the 2020 YZ450F is actually slightly lighter than the 2019 model—thanks to the lighter engine and frame components.
Weight Comparison
- 2019 YZ450F: ~238 lbs (wet weight)
- 2020 YZ450F: ~236 lbs (wet weight)
That 2-pound difference might not sound like much, but on a high-strung 450, every ounce counts. The 2020 model feels more agile in tight sections and easier to flick from side to side.
Center of Gravity
Yamaha also shifted the center of gravity slightly forward on the 2020 bike. This improves front-wheel bite in corners and reduces the tendency to wheelie under hard acceleration.
Maintenance and Reliability: Built to Last
Both the 2019 and 2020 YZ450F are known for their durability, but there are a few maintenance considerations to keep in mind.
Engine Maintenance
The 2020 engine’s lighter components mean it revs faster and may require more frequent top-end rebuilds if ridden hard. However, Yamaha improved oil flow and cooling, so overheating is less of a concern.
Electric Start System
While electric start is convenient, it adds complexity. The 2020 model includes a starter motor, battery, and wiring harness. If you’re buying used, check the battery condition and starter engagement.
Common Issues to Watch For
- 2019: Clutch wear can be aggressive if not maintained; check for slipping.
- 2020: Early models had occasional ECU glitches—ensure the bike has the latest firmware update.
Troubleshooting Common Problems
Even the best bikes can have issues. Here’s how to spot and fix common problems on both models.
Hard Starting (2019 Model)
If your 2019 YZ450F is hard to kick-start, check the following:
- Fuel quality and injector cleanliness
- Spark plug condition (replace every 15–20 hours)
- Air filter—clean or replace if dirty
Throttle Lag (2020 Model)
Some riders report slight hesitation when rolling on the throttle. This is often due to:
- Dirty throttle body—clean with carb cleaner
- Outdated ECU mapping—visit a Yamaha dealer for a reflash
- Loose throttle cable—adjust per the manual
Suspension Bottoming Out
If your fork or shock bottoms out frequently:
- Check sag settings—adjust preload as needed
- Increase compression damping slightly
- Ensure you’re using the correct spring rate for your weight
Which One Should You Buy?
Now for the big question: 2019 or 2020?
Choose the 2019 YZ450F If:
- You’re on a tight budget—used 2019 models are often $1,000–$1,500 cheaper
- You prefer a raw, high-strung power delivery
- You don’t mind kick-starting and don’t need the latest tech
Choose the 2020 YZ450F If:
- You want the latest performance and handling improvements
- Electric start and better ergonomics matter to you
- You’re racing or riding aggressively and need every advantage
- You’re willing to pay a premium for a more refined, race-ready machine
Final Verdict from Grant Langston
After logging dozens of hours on both bikes, Langston’s conclusion is clear: “The 2020 YZ450F is the better bike for 90% of riders. It’s smoother, easier to ride, and still fast enough to win races. Unless you’re chasing a deal on a 2019, go with the newer model.”
Conclusion: Ride Smarter, Not Harder
The Yamaha YZ450F has long been a favorite among motocross enthusiasts, and the leap from 2019 to 2020 proves why. With a revamped engine, improved suspension, better ergonomics, and electric start, the 2020 model offers a more complete, rider-friendly package.
While the 2019 YZ450F remains a solid performer—especially for budget-conscious buyers—the 2020 version delivers noticeable improvements in every key area. Whether you’re a weekend warrior or a competitive racer, understanding these differences helps you choose the bike that matches your skills and goals.
So, take Langston’s insights, test ride both if you can, and pick the YZ450F that fits your style. Because when it comes to dirt bikes, the right machine doesn’t just perform better—it makes you a better rider.
