MotoSpecs

2021 Honda CRF450R Specifications

Cross / motocross

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2021 Honda CRF450R Overview

The 2021 Honda CRF450R is a cross / motocross motorcycle built around 449.7 cc of displacement. Under the tank sits a Single cylinder, four-stroke engine running Single Overhead Cams (SOHC) valve actuation, a compression ratio of 13.5:1. The bore and stroke measures 96 x 62.1 mm. 2021 Honda CRF450R delivers 48 Nm @ 7000 Revolutions" of torque. The factory-quoted top speed stands at 170 km/h, making it a capable performer in its class. From a practical standpoint, the 2021 CRF450R tips the scales at 110.7 kg, carries a 6.43-litre fuel tank, offers a seat height of 965 mm and spans a 1481 mm wheelbase. Scroll down for the complete 2021 Honda CRF450R spec sheet covering every technical detail from suspension travel to tyre sizes.

2021 CRF450R - Pros & Cons

Strengths

  • Fuel injection: The fuel injection injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.

Considerations

  • 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 2021 Honda CRF450R 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

Single Overhead Cams (SOHC) 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.

CRF450R - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2021 Honda CRF450R, 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 CRF450R 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 CRF450R. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. The sump holds 1.80 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 CRF450R'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 CRF450R. 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.

2021 Honda CRF450R - Frequently Asked Questions

What engine does the 2021 Honda CRF450R have?
The 2021 Honda CRF450R uses a Single cylinder, four-stroke engine with 449.7 cc of displacement.
What is the top speed of the 2021 Honda CRF450R?
The 2021 Honda CRF450R has a factory-quoted top speed of 170 km/h. Real-world speeds vary depending on rider weight, conditions and state of tune.
How much does the 2021 Honda CRF450R weigh?
The 2021 Honda CRF450R weighs 110.7 kg. This is the manufacturer's wet figure.
How much power does the 2021 Honda CRF450R make?
The 2021 Honda CRF450R produces 48 Nm @ 7000 Revolutions" of torque.
What is the fuel tank capacity of the 2021 Honda CRF450R?
The 2021 Honda CRF450R has a 6.43-litre fuel tank.
Is the 2021 Honda CRF450R suitable for shorter riders?
The 2021 Honda CRF450R 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 2021 Honda CRF450R have?
The 2021 Honda CRF450R uses Single disc. Hydraulic. Two-piston calipers. at the front and Single disc. Hydraulic. Single-piston caliper. at the rear.
What tyre sizes does the 2021 Honda CRF450R use?
The front tyre size on the 2021 Honda CRF450R is 80/100-21.
How much oil does the 2021 Honda CRF450R take?
The 2021 Honda CRF450R takes 1.80 litres of engine oil at a full oil and filter change. Always verify against the dipstick or sight glass after filling.

Honda CRF450R Spec Evolution

The Honda CRF450R was produced across 21 model years (2002-2023). 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 2002 2003 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Wet Weight - - - - - - - 106.5 kg / 234.8 lbs 108.0 kg / 238.0 lbs 108.9 kg / 240.0 lbs 111.0 kg / 244.7 lbs 111.0 kg / 244.7 lbs 111.0 kg / 244.7 lbs 111.0 kg / 244.7 lbs 110.2 kg / 243.0 lbs 110.2 kg / 243.0 lbs 110.2 kg / 243.0 lbs 112.0 kg / 247.0 lbs 110.7 kg / 244.0 lbs 110.7 kg / 244.0 lbs 111.1 kg / 245.0 lbs
Dry Weight 102 kg / 224.9 lbs 103.1 kg / 227.3 lbs 99.1 kg / 218.5 lbs 99.1 kg / 218.5 lbs 99.1 kg / 218.5 lbs 108 kg / 238.0 lbs 109 kg / 240.3 lbs - - 88 kg / 194.0 lbs - - - - - - - - - 105.8 kg / 233.2 lbs 105.8 kg / 233.2 lbs
Engine Detail - - - - - - - - - Unicam&reg, four-valve; 36mm intake, titanium; 30mm exhaust, steel - - - - - 38mm intake valve, titanium; 31mm exhaust, steel 38mm intake valve, titanium; 31mm exhaust, steel 38mm intake valve, 31mm exhaust 38mm intake valve, 31mm exhaust 38mm intake valve, 31mm exhaust 38mm intake valve, 31mm exhaust
Engine Type Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder Single cylinder Single cylinder Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke Single cylinder, four-stroke
Seat Height 726 mm / 28.6 in. 953 mm / 37.5 in. 955 mm / 37.6 in. 955 mm / 37.6 in. 955 mm / 37.6 in. 955 mm / 37.6 in. 955 mm / 37.6 in. 955 mm / 37.6 in. 955 mm / 37.6 in. 953 mm / 37.5 in. 953 mm / 37.5 in. 953 mm / 37.5 in. 953 mm / 37.5 in. 953 mm / 37.5 in. 953 mm / 37.5 in. 953 mm / 37.5 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 9.10 litres / 2.40 gallons 7.40 litres / 1.96 gallons 7.19 litres / 1.90 gallons 7.19 litres / 1.90 gallons 7.19 litres / 1.90 gallons 7.19 litres / 1.90 gallons 7.20 litres / 1.90 gallons 5.67 litres / 1.50 gallons 5.68 litres / 1.50 gallons 5.68 litres / 1.50 gallons 6.40 litres / 1.69 gallons 6.40 litres / 1.69 gallons 6.40 litres / 1.69 gallons 6.40 litres / 1.69 gallons 6.43 litres / 1.70 gallons 6.43 litres / 1.70 gallons 6.43 litres / 1.70 US gallons 6.43 litres / 1.70 US gallons 6.43 litres / 1.70 US gallons 6.30 litres / 1.66 US gallons 6.30 litres / 1.66 US gallons
Oil Capacity (Quarts) - - - - - - - - - - 0.12 quarts 0.12 quarts 0.12 quarts 0.12 quarts 0.12 quarts 0.12 quarts 1.9 US quarts 1.9 US quarts 1.9 US quarts 1.9 US quarts 1.9 US quarts
Ground Clearance (mm) 330 mm - 340 mm 340 mm 340 mm 340 mm 340 mm 333 mm 333 mm 330 mm 330 mm 330 mm 330 mm 330 mm 330 mm 330 mm 330 mm 330 mm 335 mm 336 mm 336 mm

Key Specifications

Engine

Single cylinder, four-stroke

Power

N/A

Torque

48.0 Nm (4.9 kgf-m or 35.4 ft.lbs) @ 7000 Revolutions"

Top Speed

170.0 km/h / 105.6 mph

Weight

110.7 kg / 244.0 lbs

Fuel Capacity

6.43 litres / 1.70 US gallons

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Full 2021 Honda CRF450R Specifications

Comments Model id: CRF450R
Colours Red
Top Speed 170.0 km/h / 105.6 mph
Max Torque 48.0 Nm (4.9 kgf-m or 35.4 ft.lbs) @ 7000 Revolutions"
Fuel Control Single Overhead Cams (SOHC)
Engine Type Single cylinder, four-stroke
Displacement (ci) 27.44 cubic inches
Displacement (cc) 449.7 cc
Bore x Stroke (mm) 96.0 x 62.1 mm
Bore x Stroke (in,) 3.8 x 2.4 inches
Engine Detail 38mm intake valve, 31mm exhaust
Fuel System Injection. Programmed Fuel Injection (PGM-FI), 46mm downdraft throttle body Read
Compression Ratio 13.5:1
Ignition DC-CDI
Starter Kick
Valve System 4
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Honda CRF450R - other years

2023 2021 2017 2012 2007
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