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2018 Yamaha YZ250FX Overview
The 2018 Yamaha YZ250FX is an enduro / off-road motorcycle. Under the tank sits a Single cylinder, four-stroke engine running Double Overhead Cams/Twin Cam (DOHC) valve actuation, a compression ratio of 13.5:1. The bore and stroke measures 77 x 53.6 mm. From a practical standpoint, 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. Scroll down for the complete 2018 Yamaha YZ250FX spec sheet covering every technical detail from suspension travel to tyre sizes.
2018 YZ250FX - Pros & Cons
Strengths
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🔧
Fuel injection: The fuel injection injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
Considerations
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📏
Tall seat height: The 965 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.
Owner Experiences & Common Issues
Throttle response and fuelling
The fuel injection on the 2018 Yamaha YZ250FX is generally well-regarded. Some owners note a slight hesitation at small throttle openings when cold, which clears once the engine reaches operating temperature. A quick visual check of the injector connectors during routine servicing is good practice on higher-mileage examples.
Valve clearance checks
Double Overhead Cams/Twin Cam (DOHC) engines should have valve clearances checked at the manufacturer's specified interval. Owners report that clearances can tighten over time on higher-mileage bikes, leading to slight ticking from the top end. Catching it early keeps the job simple and avoids more costly remediation.
YZ250FX - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2018 Yamaha YZ250FX, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained YZ250FX should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task on any YZ250FX. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. The sump holds 1.50 litres, so budget for that volume of quality motorcycle-specific engine oil. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The YZ250FX's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.
Valve clearance service
Check that valve clearances have been adjusted at the correct intervals on any used YZ250FX. This is a job many owners skip because the bike does not immediately feel wrong - but tight clearances accelerate valve seat wear. Ask for proof it has been done.
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.
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. |
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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 |
- |
- |
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
Weight
112.9 kg / 249.0 lbs
Fuel Capacity
7.57 litres / 2.00 gallons
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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
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