2018 Yamaha YZ250FX Specifications

Name: 2018 Yamaha YZ250FX
Brand: Yamaha

Enduro / Off-Road • Specs last verified 13 July 2026

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2018 Yamaha YZ250FX Overview

For 2018, Yamaha offers the YZ250FX as an enduro / off-road motorcycle. The 2018 Yamaha YZ250FX is built around a Single cylinder, four-stroke engine running Double Overhead Cams/Twin Cam (DOHC) valve actuation, a compression ratio of 13.5:1. Internally, bore and stroke are 77 x 53.6 mm. In everyday use, the 2018 YZ250FX tips the scales at 112.9 kg, carries a 7.57-litre fuel tank, offers a seat height of 965 mm and spans a 1,466 mm wheelbase. That's roughly 85.9 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 2018 Yamaha YZ250FX spec sheet below.

2018 YZ250FX - Pros & Cons

Strengths

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

Tall seat height: A 965 mm seat puts flat-footing out of reach for a lot of riders - sit on it in person before committing.
Modest fuel capacity: A 7.57-litre tank keeps things light but means budgeting for more frequent fuel stops on any longer ride.
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 112.9 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 2018 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.

2018 Yamaha YZ250FX - Frequently Asked Questions

What engine does the 2018 Yamaha YZ250FX have?

The 2018 Yamaha YZ250FX is powered by a Single cylinder, four-stroke engine.

How much does the 2018 Yamaha YZ250FX weigh?

The 2018 Yamaha YZ250FX weighs 112.9 kg. This is the manufacturer's wet figure.

What is the fuel tank capacity of the 2018 Yamaha YZ250FX?

The 2018 Yamaha YZ250FX has a 7.57-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 126-151 km between stops.

Is the 2018 Yamaha YZ250FX suitable for shorter riders?

The 2018 Yamaha YZ250FX has a seat height of 965 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 2018 Yamaha YZ250FX have?

The 2018 Yamaha YZ250FX uses Single disc. Hydraulic. at the front and Single disc. Hydraulic. at the rear.

What tyre sizes does the 2018 Yamaha YZ250FX use?

The 2018 Yamaha YZ250FX runs 90/90-21 front and 110/100-18 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

How much oil does the 2018 Yamaha YZ250FX take?

The 2018 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	-	-	-	-	-	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.	-	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	-	-	New Cylinder Head and Intake System.	-	-	-	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

112.9 kg / 249.0 lbs

Fuel Capacity

7.57 litres / 2.00 gallons

Full 2018 Yamaha YZ250FX Specifications

Colours Team Yamaha Blue

Warranty 30 Day Limited Factory Warranty

Ground Clearance (mm) 325 mm

Ground Clearance (in.) 12.8 inches

Seat Height 965 mm / 38.0 in.

Wheelbase 1,466 mm / 57.7 in.

Height 1,280 mm / 50.4 in.

Length 2,164 mm / 85.2 in.

Width 826 mm / 32.5 in.

Oil Capacity (Quarts) 0.10 quarts

Oil Capacity (l) 1.50 litres

Fuel Capacity 7.57 litres / 2.00 gallons

Wet Weight 112.9 kg / 249.0 lbs

Fuel Control Double Overhead Cams/Twin Cam (DOHC)

Engine Type Single cylinder, four-stroke

Bore x Stroke (mm) 77.0 x 53.6 mm

Bore x Stroke (in,) 3.0 x 2.1 inches

Engine Detail Titanium valves

Fuel System Injection. Keihin® 44mm

Compression Ratio 13.5:1

Starter Electric

Valve System 4

Clutch Multiplate wet clutch

Final Drive Chain

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 26.3°

Trail 114 mm / 4.5 in.

Wheel Travel - Front 310 mm / 12.2 in.

Wheel Travel - Rear 318 mm / 12.5 in.

Brakes - Front Diameter (in.) 10.6 inches

Brakes - Front Diameter (mm) 270 mm

Brakes - Rear Diameter (in.) 9.6 inches

Brakes - Rear Diameter (mm) 245 mm

Brakes - Front Single disc. Hydraulic.

Brakes - Rear Single disc. Hydraulic.

Rims Dunlop® AT81F tyres

Tyres - Front 90/90-21

Tyres - Rear 110/100-18

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.