2018 Honda CRF450RX Specifications

Name: 2018 Honda CRF450RX
Brand: Honda

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

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2018 Honda CRF450RX Overview

Honda CRF450RX is an enduro / off-road motorcycle. Power comes from a Single cylinder, four-stroke engine running Single Overhead Cams (SOHC) valve actuation, a compression ratio of 13.5:1. Bore and stroke come in at 96 x 62 mm. On the road, the 2018 CRF450RX tips the scales at 116.6 kg, carries an 8.33-litre fuel tank, offers a seat height of 960 mm and spans a 1,476 mm wheelbase. That's roughly 53.2 kg lighter than the average enduro / off-road motorcycle in our database. The full 2018 Honda CRF450RX spec sheet below covers every technical detail, from suspension travel to tyre sizes.

2018 Honda CRF450RX compared with other bikes in the Enduro / Off-Road category

We checked the recorded figures for the 2018 Honda CRF450RX against up to 1146 bikes in the Enduro / Off-Road category in our database, counting each model once at the model year nearest to this one.

Only 89 of the other 1145 bikes in the Enduro / Off-Road category have a taller seat height than the 960 mm of the CRF450RX.
With 116.6 kg, the CRF450RX has the joint 166th lightest wet weight of 774 bikes in the Enduro / Off-Road category, 31% below the category average of 169.8 kg.
Narrowing the field to the 509 models within five model years of it, the seat height of 960 mm is taller than that of 410 of the other 508.

Versus the 2017 model

Compared with the 2017 model, wet weight fell from 118.4 kg to 116.6 kg (-1.8 kg). Seat height is unchanged.

2018 CRF450RX - Pros & Cons

Strengths

Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
Strong front braking: Stopping power up front is strong thanks to the single disc setup, with plenty of room to upgrade further with braided lines.

Considerations

Tall seat height: At 960 mm, shorter riders will likely be on tiptoes at a standstill - worth sitting on one before you buy.
Modest fuel capacity: Range between stops is limited by the 8.33-litre tank - plan fuel stops accordingly on longer routes.
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 CRF450RX 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 Single Overhead Cams (SOHC) valve gear, the CRF450RX 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 with two-piston calipers - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Suspension condition on used examples

The CRF450RX's suspension runs 49mm inverted Showa fork with rebound and compression damping adjustability at the front. The rear uses Pro-Link® Showa single shock with adjustable spring preload, rebound and compression damping adjustability. Fork-seal condition and rear linkage play are the two things worth checking before buying used.

Final drive maintenance

The CRF450RX 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 Semi-double cradle, aluminium twin-spar, the CRF450RX'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

116.6 kg keeps the CRF450RX easy to move around in tight spaces, car parks and on the stand alike.

CRF450RX - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 2018 Honda CRF450RX enduro / off-road, cover the fundamentals: service book and oil change history, drivetrain wear, and any sign of oil weeping around the casings. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 8 years old, this enduro / off-road is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. Cold-starting it yourself tells you a lot - a healthy CRF450RX should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects the CRF450RX's single cylinder, four-stroke engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). With a 13.5:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Match the viscosity grade to what the owner's manual specifies, not what's cheapest.

Fuel system care

Fuel injection on the CRF450RX 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 CRF450RX 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.

2018 Honda CRF450RX - Frequently Asked Questions

What engine does the 2018 Honda CRF450RX have?

The 2018 Honda CRF450RX is powered by a Single cylinder, four-stroke engine.

How much does the 2018 Honda CRF450RX weigh?

The 2018 Honda CRF450RX weighs 116.6 kg. This is the manufacturer's wet figure.

What is the fuel tank capacity of the 2018 Honda CRF450RX?

The 2018 Honda CRF450RX has an 8.33-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 138-166 km between stops.

Is the 2018 Honda CRF450RX suitable for shorter riders?

The 2018 Honda CRF450RX has a seat height of 960 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 Honda CRF450RX have?

The 2018 Honda CRF450RX uses single disc with two-piston calipers at the front and single disc at the rear.

What tyre sizes does the 2018 Honda CRF450RX use?

The 2018 Honda CRF450RX runs 90/90-21 front and 120/90-18 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What fuel system does the 2018 Honda CRF450RX use?

The 2018 Honda CRF450RX uses Injection. Programmed Fuel Injection (PGM-FI), providing precise fuelling across the rev range and reliable cold-start behaviour.

Honda CRF450RX Spec Evolution

The Honda CRF450RX was produced across 7 model years (2017-2023). 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	2017	2018	2019	2020	2021	2022	2023
Wet Weight	118.4 kg / 261.0 lbs	116.6 kg / 257.0 lbs	116.6 kg / 257.0 lbs	115.7 kg / 255.0 lbs	113.9 kg / 251.0 lbs	113.9 kg / 251.0 lbs	113.9 kg / 251.0 lbs
Engine Detail	Titanium Intake Valves	38mm intake valve, titanium; 31mm exhaust, steel	38mm intake valve, titanium; 31mm exhaust, steel	38mm intake valve, titanium; 31mm exhaust, steel	38mm intake valve, titanium; 31mm exhaust, steel	-	-
Seat Height	960 mm / 37.8 in.	960 mm / 37.8 in.	960 mm / 37.8 in.	960 mm / 37.8 in.	965 mm / 38.0 in.	965 mm / 38.0 in.	965 mm / 38.0 in.
Fuel Capacity	8.33 litres / 2.20 gallons	8.33 litres / 2.20 gallons	8.52 litres / 2.25 US gallons	8.52 litres / 2.25 US gallons	7.95 litres / 2.10 US gallons	8.00 litres / 2.11 US gallons	8.00 litres / 2.11 US gallons
Ground Clearance (mm)	328 mm	328 mm	328 mm	328 mm	335 mm	336 mm	336 mm
Ground Clearance (in.)	12.9 inches	12.9 inches	12.9 inches	12.9 inches	13.2 inches	13.2 inches	13.2 inches
Comments	Model ID: CRF450RX.	Model ID: CRF450RX.	Model ID: CRF450RX.	Titanium fuel tank. Model ID: CRF450RX.	Model ID: CRF450RX.	3 ride modes. Model ID: CRF450RX.	Model ID: CRF450RX.
Bore x Stroke (mm)	96.0 x 62.0 mm	96.0 x 62.0 mm	96.0 x 62.0 mm	96.0 x 62.0 mm	96.0 x 62.0 mm	96.0 x 62.1 mm	96.0 x 62.1 mm

Key Specifications

Engine

Single cylinder, four-stroke

Power

Not recorded

Torque

Not recorded

Top Speed

Not recorded

Weight

116.6 kg / 257.0 lbs

Fuel Capacity

8.33 litres / 2.20 gallons

Full 2018 Honda CRF450RX Specifications

Comments Model ID: CRF450RX.

Colours Red

Ground Clearance (in.) 12.9 inches

Ground Clearance (mm) 328 mm

Seat Height 960 mm / 37.8 in.

Wheelbase 1,476 mm / 58.1 in.

Fuel Capacity 8.33 litres / 2.20 gallons

Wet Weight 116.6 kg / 257.0 lbs

Engine Type Single cylinder, four-stroke

Fuel Control Single Overhead Cams (SOHC)

Bore x Stroke (in,) 3.8 x 2.4 inches

Bore x Stroke (mm) 96.0 x 62.0 mm

Engine Detail 38mm intake valve, titanium; 31mm exhaust, steel

Fuel System Injection. Programmed Fuel Injection (PGM-FI)

Compression Ratio 13.5:1

Fuel Reserve 1.60 litres / 0.42 gallons

Ignition Full transistorized with electronic advance

Starter Electric & kick

Valve System 4

Final Drive Chain

Gearbox 5-speed

Primary Drive #520 T-ring-sealed chain; 13T/51T

Frame Type Semi-double cradle, aluminium twin-spar

Suspension - Front 49mm inverted Showa fork with rebound and compression damping adjustability

Suspension - Rear Pro-Link® Showa single shock with adjustable spring preload, rebound and compression damping adjustability

Rake 27.2°

Trail 116 mm / 4.6 in.

Wheel Travel - Front 305 mm / 12.0 in.

Wheel Travel - Rear 312 mm / 12.3 in.

Brakes - Front Diameter (in.) 10.2 inches

Brakes - Front Diameter (mm) 260 mm

Brakes - Rear Diameter (in.) 9.4 inches

Brakes - Rear Diameter (mm) 240 mm

Brakes - Front Single disc. Two-piston calipers.

Brakes - Rear Single disc

Rims Dunlop Geomax tires

Tyres - Front 90/90-21

Tyres - Rear 120/90-18

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