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2023 Yamaha YZ450FX Overview
Yamaha YZ450FX is an enduro / off-road motorcycle, displacing 449.7 cc. Power comes from a Single cylinder, four-stroke engine running Double Overhead Cams/Twin Cam (DOHC) valve actuation, a compression ratio of 13.0:1. Bore and stroke come in at 97 x 60.9 mm. On the road, the 2023 YZ450FX tips the scales at 115.2 kg, carries a 8.33-litre fuel tank, offers a seat height of 955 mm and spans a 1481 mm wheelbase. That's roughly 83.6 kg lighter than the average enduro / off-road motorcycle in our database. The full 2023 Yamaha YZ450FX spec sheet below covers every technical detail, from suspension travel to tyre sizes.
2023 YZ450FX - Pros & Cons
Strengths
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🔧
Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
Considerations
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📏
Tall seat height: At 955 mm, shorter riders will likely be on tiptoes at a standstill - worth sitting on one before you buy.
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⛽
Modest fuel capacity: Range between stops is limited by the 8.33-litre tank - plan fuel stops accordingly on longer routes.
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⚙️
Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.
Wear Points & Servicing Notes
Fuelling & injector care
The fuel injection on the YZ450FX needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.
Valve clearance checks
With Double Overhead Cams/Twin Cam (DOHC) valve gear, the YZ450FX needs periodic clearance checks; caught early they're a cheap adjustment, left unchecked they accelerate valve seat wear.
Brake disc and pad wear
Braking up front comes from Single disc. Hydraulic - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.
Suspension condition on used examples
The YZ450FX's suspension runs KYB® spring-type fork with speed sensitive damping; fully adjustable at the front. The rear uses KYB® single shock; full adjustable. Fork-seal condition and rear linkage play are the two things worth checking before buying used.
Final drive maintenance
The YZ450FX uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.
Frame & chassis check
Built around a Aluminum Bilateral Beam, the YZ450FX's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.
Low-speed handling
115.2 kg keeps the YZ450FX easy to move around in tight spaces, car parks and on the stand alike.
YZ450FX - Buying & Maintenance Guide
What to check before buying
Before handing over money for a used 2023 Yamaha YZ450FX, cover the fundamentals: service book and oil change history, chain and sprocket wear, and any sign of oil weeping around the casings. Cold-starting it yourself tells you a lot - a healthy YZ450FX should catch quickly and settle into a smooth idle.
Oil and filter changes
Nothing protects a YZ450FX's engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). Match the viscosity grade to what the owner's manual specifies, not what's cheapest.
Fuel system care
Fuel injection on the YZ450FX needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.
Valve clearance service
Valve clearances are easy to overlook on a used YZ450FX since a bike out of spec doesn't always feel obviously wrong - but the wear it causes is real. Ask the seller for documentation before assuming it's been done.
2023 Yamaha YZ450FX - Frequently Asked Questions
What engine does the 2023 Yamaha YZ450FX have?
The 2023 Yamaha YZ450FX uses a Single cylinder, four-stroke engine with 449.7 cc of displacement.
How much does the 2023 Yamaha YZ450FX weigh?
The 2023 Yamaha YZ450FX weighs 115.2 kg. This is the manufacturer's wet figure.
What is the fuel tank capacity of the 2023 Yamaha YZ450FX?
The 2023 Yamaha YZ450FX has a 8.33-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 138-166 km between stops.
Is the 2023 Yamaha YZ450FX suitable for shorter riders?
The 2023 Yamaha YZ450FX has a seat height of 955 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2023 Yamaha YZ450FX have?
The 2023 Yamaha YZ450FX uses Single disc. Hydraulic at the front and Single disc. Hydraulic at the rear.
What tyre sizes does the 2023 Yamaha YZ450FX use?
The front tyre size on the 2023 Yamaha YZ450FX is 80/100-21.
What fuel system does the 2023 Yamaha YZ450FX use?
The 2023 Yamaha YZ450FX uses Injection. Mikuni® 44mm, providing precise fuelling across the rev range and reliable cold-start behaviour.
Yamaha YZ450FX Spec Evolution
The Yamaha YZ450FX was produced across 8 model years (2016-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2016 |
2017 |
2018 |
2019 |
2020 |
2021 |
2022 |
2023 |
| Wet Weight |
118.8 kg / 262.0 lbs |
118.8 kg / 262.0 lbs |
118.8 kg / 262.0 lbs |
116.1 kg / 256.0 lbs |
116.1 kg / 256.0 lbs |
115.2 kg / 254.0 lbs |
115.2 kg / 254.0 lbs |
115.2 kg / 254.0 lbs |
| Seat Height |
965 mm / 38.0 in. |
965 mm / 38.0 in. |
965 mm / 38.0 in. |
965 mm / 38.0 in. |
965 mm / 38.0 in. |
955 mm / 37.6 in. |
955 mm / 37.6 in. |
955 mm / 37.6 in. |
| Fuel Capacity |
7.57 litres / 2.00 gallons |
7.57 litres / 2.00 gallons |
7.57 litres / 2.00 gallons |
8.33 litres / 2.20 US gallons |
8.33 litres / 2.20 US gallons |
8.33 litres / 2.20 US gallons |
8.33 litres / 2.20 US gallons |
8.33 litres / 2.20 US gallons |
| Ground Clearance (in.) |
13.2 inches |
13.2 inches |
13.2 inches |
13.2 inches |
13.2 inches |
13.2 inches |
12.6 inches |
12.6 inches |
| Comments |
- |
- |
- |
- |
- |
Power Tuner app |
Power Tuner app |
Power Tuner App. Adjustable Engine Mapping. |
| Bore x Stroke (mm) |
97.0 x 60.8 mm |
97.0 x 60.8 mm |
97.0 x 60.8 mm |
97.0 x 60.9 mm |
97.0 x 60.9 mm |
97.0 x 60.9 mm |
97.0 x 60.9 mm |
97.0 x 60.9 mm |
| Ground Clearance (mm) |
335 mm |
335 mm |
335 mm |
335 mm |
335 mm |
335 mm |
320 mm |
320 mm |
| Frame Type |
Aluminum Bilateral Beam frame |
Aluminum Bilateral Beam frame |
Aluminum Bilateral Beam frame |
Aluminum Bilateral Beam frame |
Aluminum Bilateral Beam frame |
Aluminum Bilateral Beam frame |
Aluminum Bilateral Beam frame |
Aluminum Bilateral Beam |
Key Specifications
Engine
Single cylinder, four-stroke
Power
Not published by manufacturer
Torque
Not published by manufacturer
Top Speed
Not published by manufacturer
Weight
115.2 kg / 254.0 lbs
Fuel Capacity
8.33 litres / 2.20 US gallons
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Full 2023 Yamaha YZ450FX Specifications
Comments
Power Tuner App. Adjustable Engine Mapping.
Colours
Team Yamaha Blue
Warranty
30 Day Limited Factory Warranty
Ground Clearance (in.)
12.6 inches
Ground Clearance (mm)
320 mm
Seat Height
955 mm / 37.6 in.
Wheelbase
1481 mm / 58.3 in.
Height
1280 mm / 50.4 in.
Length
2174 mm / 85.6 in.
Width
826 mm / 32.5 in.
Fuel Capacity
8.33 litres / 2.20 US gallons
Wet Weight
115.2 kg / 254.0 lbs
Bore x Stroke (in,)
3.8 x 2.4 inches
Bore x Stroke (mm)
97.0 x 60.9 mm
Displacement (cc)
449.7 cc
Displacement (ci)
27.44 cubic inches
Engine Type
Single cylinder, four-stroke
Fuel Control
Double Overhead Cams/Twin Cam (DOHC)
Engine Detail
Titanium valves
Fuel System
Injection. Mikuni® 44mm
Compression Ratio
13.0:1
Engine Lubrication
Wet sump
Starter
Electric
Valve System
4
Clutch
Wet multi-disc
Final Drive
Chain (final drive)
Gearbox
5-speed
Primary Drive
O-ring chain
Frame Type
Aluminum Bilateral Beam
Suspension - Front
KYB® spring-type fork with speed sensitive damping; fully adjustable
Suspension - Rear
KYB® single shock; full adjustable
Rake
27.2°
Trail
117 mm / 4.6 in.
Wheel Travel - Front
310 mm / 12.2 in.
Wheel Travel - Rear
318 mm / 12.5 in.
Brakes - Front
Single disc. Hydraulic
Brakes - Rear
Single disc. Hydraulic
Rims
Dunlop Geomax MX33 tyres
Tyres - Front
80/100-21
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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