Yamaha Yz 450 F
The Yamaha Yz 450 F has a top speed of ~145 km/h (note: estimated under optimal conditions on a straight; varies by rider and terrain), produces ~62 hp and weighs 110 kg. Motoryk rates it 8.5/10.
The Yamaha YZ450F was introduced in 2003 as an evolution of the YZ426F, featuring a more compact and refined 450cc four-stroke motocross engine. Over the years it has undergone significant redesigns, most notably in 2010 with a reverse-cylinder engine layout and in 2018 with electric start and launch control, cementing its reputation as one of the most advanced factory motocross bikes. It has been ridden to multiple AMA Supercross and Motocross championships, making it a benchmark in the 450cc motocross class.
~62 hp
Power
~52 Nm
Torque
110 kg
Weight
~145 km/h (note: estimated under optimal conditions on a straight; varies by rider and terrain)
Top Speed
Estimate: ~6-8 L/100km under typical motocross/off-road riding conditions (note: highly variable depending on riding intensity; not designed for road use)
Fuel
Naked
Body
Video Review
What Buyers Should Know
Reverse Cylinder Engine
The YZ450F features a unique reverse-inclined engine layout that centralizes mass for sharper handling. This design is rare in motocross and gives it a distinct performance edge over competitors.
Watch the Valves
Valve clearance checks are critical on the YZ450F and should be inspected every 15-20 hours of riding. Neglected valve maintenance is the most common cause of costly engine damage on used examples.
Strong Resale Value
The YZ450F consistently holds its value better than most motocross bikes, largely due to Yamaha's reputation for reliability. A well-maintained example can retain 60-70% of its value after two years.
Generations & Specs by Year
Introduced as successor to YZ426F; 449cc engine, aluminum frame, aggressive power delivery.
"Raw, punishing, brilliant — if you can handle it."
Yamaha dropped a bomb on the class with this thing — lighter than the 426, snappier, and with a hit that'll rearrange your fillings if you're not paying attention. The aluminum frame transformed the handling; it actually steered instead of plowing, and on hardpack it was genuinely confidence-inspiring. But that power delivery was a double-edged sword: mid-range to top-end it explodes with zero warning, and if you were a B-class rider or still building your chops, it would spit you off faster than you could blink. Maintenance costs were real too — valves needed checking every few ride days, and ignoring that got expensive quick.
Pros
Cons
Revised cylinder head, new exhaust, updated suspension settings, improved throttle response and handling.
"The gen that finally made YZ450F a complete package."
Yamaha addressed the Gen 1's notorious snappy power delivery with a revised head and new exhaust, and the difference is real — this bike pulls cleaner out of corners without that jarring hit that used to swap the rear mid-turn. At 110 kg wet it still feels planted through choppy braking bumps, and the updated suspension settings suit a wider range of riders than the stiff, race-only setup of its predecessor. The seat height is honest — 985 mm is tall, and shorter riders will feel it at low-speed sections. My one genuine gripe is the throttle still has a slightly wooden feel in the first third, and if you're not on top of the jetting for your altitude, it can run lean and hot on long motos.
Pros
Cons
New forward-tilted engine layout, fuel injection ready design, revised chassis, lighter overall weight.
Fuel injection introduced, rearward-tilted engine, new frame, electric start option added later.
Revised frame, new KYB suspension, updated fuel injection, improved mass centralization and ergonomics.
Completely redesigned; new frame, engine, bodywork, launch control, handlebar-mounted power tuner connector.
Revised power delivery, updated suspension, new seat foam, traction control and multiple power modes added.
New frame, revised engine internals, updated bodywork, improved power tuner app connectivity and electronics.
Used Buyer Review
"An unforgiving elite machine that rewards experienced, mechanically-aware riders only."
$4,500-$7,500 usedThe YZ450F is a proper weapon, and buying one used means someone else already paid the depreciation hit. That said, this thing will find you out fast — it's not a beginner's machine or a casual trail bike. The power delivery is aggressive and front-heavy, demanding respect from the first throttle crack. Check the hours meter religiously and assume whoever owned it before you rode the hell out of it, because they probably did. Mechanically, Yamaha's engine is impressively bulletproof if the maintenance schedule was followed. That's your biggest gamble with used — has the piston been replaced around the 80-100 hour mark? Ask for receipts. Suspension linkages wear fast under aggressive riders, and revalving costs money. Post-2018 models with the reverse-cylinder layout are noticeably better balanced and worth hunting for specifically. The electric start on later models is genuinely useful and not a gimmick. Budget realistically. Whatever you pay for the bike, add another $500-800 for consumables, a fresh piston, and suspension refresh. Go in with eyes open and this bike will absolutely deliver.
Top 10 Accessories
Curated picks for the Yamaha Yz 450 F — owned, ridden, recommended.
Common Problems
🔥 2 CRITICALCold start difficulty, ticking noise, compression test
Inspect rear subframe welds and alignment visually
Oil streaks on fork legs, soft or clunky feel
Pull dipstick, dark sludgy oil, ask service history
✅Pre-Purchase Checklist
Reliable if maintained, punishing if neglected
Full Specifications
Rivals & Alternatives
Bikes that buyers cross-shop with the Yamaha Yz 450 F
Ktm Sx 450
Kawasaki Kx 450
Ktm Sx-f 450
Suzuki Rm-z 450
Yamaha Yz450f
Compare Yamaha Yz 450 F Side-by-Side
compare_arrowsSpecs, power, weight & buyer verdict — head-to-head with the bikes most often cross-shopped.
Yamaha Yz 450 F vs Ktm Sx 450
Specs · Power · Buyer verdict
Yamaha Yz 450 F vs Kawasaki Kx 450
Specs · Power · Buyer verdict
Yamaha Yz 450 F vs Ktm Sx-f 450
Specs · Power · Buyer verdict
Yamaha Yz 450 F vs Suzuki Rm-z 450
Specs · Power · Buyer verdict
Yamaha Yz 450 F vs Yamaha Yz450f
Specs · Power · Buyer verdict
More Yamaha Yz 450 F Guides
More from Yamaha
View all Yamaha models →Community Reviews
Discussion
Frequently Asked Questions
What are common problems with the Yamaha Yz 450 F? +
Valve clearance wear from hard use: Cold start difficulty, ticking noise, compression test (serious) | Bent or cracked subframe from crashes: Inspect rear subframe welds and alignment visually (moderate) | Worn fork seals and suspension components: Oil streaks on fork legs, soft or clunky feel (moderate)
Is the Yamaha Yz 450 F a good motorcycle? +
An unforgiving elite machine that rewards experienced, mechanically-aware riders only. Rating: 8.5/10. Best for: Experienced motocross racers wanting proven performance value. Avoid if: You're new to high-displacement motocross bikes.
What is the horsepower of the Yamaha Yz 450 F? +
The Yamaha Yz 450 F produces ~62 hp @ 9,500 rpm (note: figure based on modern 2020+ models; earlier models ranged 55-60 hp), with ~52 Nm @ 7,500 rpm (note: estimated based on published dyno data for recent models) of torque. Top speed: ~145 km/h (note: estimated under optimal conditions on a straight; varies by rider and terrain).
Is the Yamaha Yz 450 F good for beginners? +
Not really — the Yamaha Yz 450 F is better for experienced riders. Experienced motocross racers wanting proven performance value Avoid if: You're new to high-displacement motocross bikes
Is the Yamaha Yz 450 F reliable? +
Owners report 2 critical issues to watch for on the Yamaha Yz 450 F, notably: Valve clearance wear from hard use (Cold start difficulty, ticking noise, compression test). Buy with a pre-purchase inspection.
Is the Yamaha Yz 450 F good for daily use? +
Experienced motocross racers wanting proven performance value Fuel: Estimate: ~6-8 L/100km under typical motocross/off-road riding conditions (note: highly variable depending on riding intensity; not designed for road use).
How fast is the Yamaha Yz 450 F? +
The Yamaha Yz 450 F reaches a top speed of ~145 km/h (note: estimated under optimal conditions on a straight; varies by rider and terrain), producing 62 hp at 110 kg curb weight. Real-world performance depends on rider weight, gearing, and road conditions.
What gear should I buy for a Yamaha Yz 450 F? +
Motoryk has curated a Top 10 gear list specifically for the Yamaha Yz 450 F, covering engine oil, tires, chain, battery, and brake pads — see motoryk.com/bikes/yamaha/yz-450-f/top10. Each pick is matched to this bike's spec.
