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2021 Yamaha YZ250FX Overview
For 2021, Yamaha offers the YZ250FX as an enduro / off-road motorcycle with 250 cc on tap. The 2021 Yamaha YZ250FX is built around a Single cylinder, four-stroke engine running Double Overhead Cams/Twin Cam (DOHC) valve actuation, a compression ratio of 13.8:1. Internally, bore and stroke are 77 x 53.6 mm. In everyday use, the 2021 YZ250FX tips the scales at 111.1 kg, carries a 8.33-litre fuel tank, offers a seat height of 955 mm and spans a 1481 mm wheelbase. That's roughly 87.7 kg lighter than the average enduro / off-road motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2021 Yamaha YZ250FX spec sheet below.
2021 YZ250FX - Pros & Cons
Strengths
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🔧
Fuel injection: No choke, no jetting, no altitude compensation to think about - fuel injection just works across a wider range of conditions than carburetion.
Considerations
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📏
Tall seat height: A 955 mm seat puts flat-footing out of reach for a lot of riders - sit on it in person before committing.
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⛽
Modest fuel capacity: A 8.33-litre tank keeps things light but means budgeting for more frequent fuel stops on any longer ride.
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⚙️
Chain final drive upkeep: A chain drivetrain is the most common setup in its class, but it's also the one that demands the most regular hands-on maintenance.
Wear Points & Servicing Notes
Fuelling & injector care
Fuelling on the YZ250FX comes from fuel injection. Cold starts and throttle response stay consistent across altitude and temperature, the main practical edge over a carbureted equivalent.
Valve clearance checks
Valve clearances on Double Overhead Cams/Twin Cam (DOHC)-equipped engines like the YZ250FX's drift slowly with mileage rather than failing suddenly - sticking to the service interval keeps it a non-issue.
Brake disc and pad wear
Single disc. Hydraulic. up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.
Suspension condition on used examples
Suspension duties are handled by KYB® spring-type fork with speed sensitive damping; fully adjustable up front and KYB® single shock; full adjustable at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.
Final drive maintenance
Chain final drive on the YZ250FX means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.
Frame & chassis check
The Bilateral beam frame chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.
Low-speed handling
The YZ250FX's 111.1 kg kerb weight makes low-speed control noticeably less effort than on a heavier machine.
YZ250FX - Buying & Maintenance Guide
What to check before buying
A pre-purchase check on the 2021 Yamaha YZ250FX should cover the same ground every time: service history, chain and sprocket condition, and any oil seepage around the casings. Start it from cold if you can - a well-kept YZ250FX settles to a smooth idle within seconds.
Oil and filter changes
Oil changes are the cheapest insurance you can buy for a YZ250FX's engine - keep to the manufacturer's interval rather than stretching it. The sump holds 1.50 litres, so budget for that volume of quality motorcycle-specific engine oil. Use the viscosity grade the manual specifies, not whatever's on sale.
Fuel system care
Injector systems like the YZ250FX's hold up well with basic care - decent fuel, an occasional cleaner additive, and draining old fuel before any layup longer than three months.
Valve clearance service
There's no reliable seat-of-the-pants way to tell if a YZ250FX's valve clearances are in spec - a light top-end tick is the only real warning sign, and by then some wear has already happened. Service records are the only proof.
2021 Yamaha YZ250FX - Frequently Asked Questions
What engine does the 2021 Yamaha YZ250FX have?
The 2021 Yamaha YZ250FX uses a Single cylinder, four-stroke engine with 250 cc of displacement.
How much does the 2021 Yamaha YZ250FX weigh?
The 2021 Yamaha YZ250FX weighs 111.1 kg. This is the manufacturer's wet figure.
What is the fuel tank capacity of the 2021 Yamaha YZ250FX?
The 2021 Yamaha YZ250FX 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 2021 Yamaha YZ250FX suitable for shorter riders?
The 2021 Yamaha YZ250FX 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 2021 Yamaha YZ250FX have?
The 2021 Yamaha YZ250FX uses Single disc. Hydraulic. at the front and Single disc. Hydraulic. at the rear.
What tyre sizes does the 2021 Yamaha YZ250FX use?
The front tyre size on the 2021 Yamaha YZ250FX is 80/90-21.
How much oil does the 2021 Yamaha YZ250FX take?
The 2021 Yamaha YZ250FX takes 1.50 litres of engine oil at a full oil and filter change. Always verify against the dipstick or sight glass after filling.
Yamaha YZ250FX Spec Evolution
The Yamaha YZ250FX was produced across 9 model years (2015-2023). 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 |
2015 |
2016 |
2017 |
2018 |
2019 |
2020 |
2021 |
2022 |
2023 |
| Wet Weight |
112.9 kg / 249.0 lbs |
112.9 kg / 249.0 lbs |
112.9 kg / 249.0 lbs |
112.9 kg / 249.0 lbs |
112.9 kg / 249.0 lbs |
111.1 kg / 245.0 lbs |
111.1 kg / 245.0 lbs |
111.1 kg / 245.0 lbs |
111.1 kg / 245.0 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. |
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 |
7.57 litres / 2.00 gallons |
7.57 litres / 2.00 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 |
| Oil Capacity (Quarts) |
0.10 quarts |
0.10 quarts |
0.10 quarts |
0.10 quarts |
1.59 US quarts |
1.59 US quarts |
1.59 US quarts |
1.59 US quarts |
1.59 US quarts |
| Mods from previous model |
- |
- |
- |
- |
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From fender to fender, the YZ250FX is all-new. New engine, improved electronics, new frame, revised suspension, a thinner and lower body, and more—this machine is ready to put riders on top of the podium. |
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Stronger mid- to high-range power. High-spec braking components. |
Stronger mid- to high-range power. High-spec braking components. |
| Ground Clearance (mm) |
325 mm |
325 mm |
325 mm |
325 mm |
325 mm |
320 mm |
320 mm |
320 mm |
320 mm |
| Ground Clearance (in.) |
12.8 inches |
12.8 inches |
12.8 inches |
12.8 inches |
12.8 inches |
12.6 inches |
12.6 inches |
12.6 inches |
12.6 inches |
| Comments |
- |
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New Cylinder Head and Intake System. |
- |
- |
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Power Tuner app |
Power Tuner app. |
Power Tuner app. Selectable Fuel Maps. |
Key Specifications
Engine
Single cylinder, four-stroke
Power
Not published by manufacturer
Torque
Not published by manufacturer
Top Speed
Not published by manufacturer
Weight
111.1 kg / 245.0 lbs
Fuel Capacity
8.33 litres / 2.20 US gallons
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Full 2021 Yamaha YZ250FX Specifications
Comments
Power Tuner app
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
1270 mm / 50.0 in.
Length
2174 mm / 85.6 in.
Width
826 mm / 32.5 in.
Oil Capacity (l)
1.50 litres
Oil Capacity (Quarts)
1.59 US quarts
Fuel Capacity
8.33 litres / 2.20 US gallons
Wet Weight
111.1 kg / 245.0 lbs
Bore x Stroke (in,)
3.0 x 2.1 inches
Bore x Stroke (mm)
77.0 x 53.6 mm
Displacement (cc)
250.0 cc
Displacement (ci)
15.26 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
13.8:1
Starter
Electric
Valve System
4
Clutch
Multiplate wet clutch
Final Drive
Chain (final drive)
Gearbox
6-speed
Primary Drive
O-ring chain
Frame Type
Bilateral beam frame
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® MX3S® tyres
Tyres - Front
80/90-21
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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