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Honda CRF450R 2021

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Motocross / Racing

2021 Honda CRF450R

450cc

4-stroke

55.2hp

Measured power

244lb

Curb weight

38in

Seat height

12.2in

Front travel

2021 Honda CRF450R at a glanceQuick facts

  • The 2021 Honda CRF450R has a 450cc fuel-injected 4-stroke engine, a 5-speed gearbox and electric start.
  • The 2021 CRF450R weighs 244 lb ready to ride and has a 38 in seat height.
  • The 2021 CRF450R runs 80/100-21 front and 120/80-19 rear tires.
  • The 2021 CRF450R takes 1.1 US qt (1.0 L) of 10W-30 engine oil; change it every 6 races or about 15 hours.
  • The 2021 CRF450R lists at $9,599 (US MSRP). It is not street legal in the US.

About the 2021 Honda CRF450RThe machine

The 2021 Honda CRF450R is a closed-course motocross bike powered by a fuel-injected, liquid-cooled 450cc single-cylinder four-stroke with a SOHC four-valve head and five-speed transmission. This generation brought an all-new frame and swingarm, slimmer bodywork, a revised engine, and a single exhaust in place of the previous twin pipes. A titanium fuel tank, Honda Selectable Torque Control, HRC launch control, a handlebar map switch, and a stock skid plate are part of its equipment. Fully adjustable Showa suspension provides 12.2 inches of front travel and 12.4 inches at the rear, with a 49mm inverted coil-spring fork up front.

Who should ride it

This CRF450R is for motocross racers and experienced riders who want a competition-focused bike for closed-course track riding. Its 450cc four-stroke engine, launch control, and adjustable suspension suit riders building speed through practice motos or lining up for races. It is not intended for beginners looking for a mild first dirt bike or trail riders seeking a US street-legal machine.

2021 Honda CRF450R photosGarage

01 / 03

2021 Honda CRF450R specificationsTech specs

Engine
Displacement
450cc
Stroke
4-stroke
Fuel system
Fuel injection
Bore × stroke
96 × 62.1 mm
Compression
13.5:1
Power (measured)
55.2 hp at the rear wheel
Cooling
Liquid
Configuration
Single-cylinder
Valve train
SOHC
Valves
4
Engine oil
1.1 US qt (1.0 L)
Oil type
10W-30
Coolant
1.1 US qt (1.08 L)
Clutch
Type
Wet multiplate
Actuation
Hydraulic
Drivetrain
Starting
Electric
Transmission
5-speed
Chain size
520
Chain links
114
Front sprocket
13T
Rear sprocket
49T
Dimensions
Seat height
38″
Ground clearance
13.2″
Wheelbase
58.3″
Width
32.6″
Height
49.9″
Length
85.9″
Curb weight
244 lb
Fuel capacity
1.66 gal
Price & warranty
Destination charge
$380
Colors
Red
Warranty
Sold “as is” with no warranties.
Equipment
Honda Selectable Torque Control
Standard
HRC Launch Control
Standard
Frame & steering
Frame material
Aluminum
Rake
27.1°
Trail
4.5″
Suspension
Front
49mm fully adjustable leading-axle inverted Showa coil-spring fork
Front travel
12.2″
Rear
Pro-Link Showa single shock, fully adjustable
Rear travel
12.4″
Wheels & tires
Front wheel
21″
Rear wheel
19″
Front tire
Dunlop Geomax MX33 80/100-21
Rear tire
Dunlop Geomax MX33 120/80-19
Brakes
Front disc
260 mm
Rear disc
240 mm
Stock features
Map switch
Yes
Skid plate
Yes
Street legal (US)
No
Battery / electrical
Battery
Yes
OEM battery
HY85S
Chemistry
Lithium
Voltage
12V
Capacity
2 Ah

2021 Honda CRF450R maintenanceWrench time

From the maker's manuals. Tap a row to see the manual page it comes from.

Service intervals
Change engine oil
Every 6 races or about 15 hours
Replace oil filter
Every 6 races or about 15 hours
Clean air filter
Every race or about 2.5 hours
Inspect spark plug
Every race or about 2.5 hours
Change engine oil (first time)
After the first break-in ride
Replace oil filter (first time)
After the first break-in ride
Spark plug
Spark plug
NGK SILMAR10A-9S
Plug gap
0.031 – 0.035 in (0.80 – 0.90 mm)
Torque specs
Oil drain bolt
13 ft‑lb (18 N·m, 1.8 kgf·m)
Spark plug
16 ft‑lb (22 N·m, 2.2 kgf·m)
Front axle
65 ft‑lb (88 N·m, 9.0 kgf·m)
Front axle pinch bolts
15 ft‑lb (20 N·m, 2.0 kgf·m)
Rear axle nut
94 ft‑lb (128 N·m, 13.1 kgf·m)
Upper triple clamp bolts
16 ft‑lb (22 N·m, 2.2 kgf·m)
Lower triple clamp bolts
15 ft‑lb (20 N·m, 2.0 kgf·m)
Handlebar clamp bolts
16 ft‑lb (22 N·m, 2.2 kgf·m)
Front brake caliper mounting bolts
22 ft‑lb (30 N·m, 3.1 kgf·m)
Rear sprocket nuts
30 ft‑lb (40 N·m, 4.1 kgf·m)
Front sprocket bolt
23 ft‑lb (31 N·m, 3.2 kgf·m)
Chain adjuster locknut
20 ft‑lb (27 N·m, 2.8 kgf·m)
Shock absorber mounting bolts
32 ft‑lb (44 N·m, 4.5 kgf·m)

Parts for the 2021 Honda CRF450RParts that fit

Exact parts for this bike. Tap one to see every store we found selling it, cheapest first.

Maintenance

Oil, filters, spark plug, battery, brakes and drive parts you replace as you ride.

Prices include shipping where the store lists it and were checked Oct 31, 2026. Prices change, so confirm at the store before you buy.

Honda CRF450R FAQPit-lane questions

  1. 01

    How much power does the 2021 Honda CRF450R make?

    It measured 55.2 hp on a dyno.

  2. 02

    What kind of engine does the 2021 Honda CRF450R have?

    It has a fuel-injected, liquid-cooled 450cc four-stroke single-cylinder engine with SOHC valve actuation and four valves.

  3. 03

    What is the seat height of the 2021 Honda CRF450R?

    The seat height is 38 inches.

  4. 04

    How much does the 2021 Honda CRF450R weigh?

    Its curb weight is 244 lb.

  5. 05

    How much fuel does the 2021 Honda CRF450R hold?

    The fuel capacity is 1.66 gal.

  6. 06

    What oil does the 2021 Honda CRF450R use?

    It uses SAE 10W-30 engine oil, with a capacity of 1.1 US qt.

  7. 07

    Is the 2021 Honda CRF450R street legal in the US?

    No. It is a closed-course competition-only model and is not street legal in the US.

  8. 08

    What is the suspension travel on the 2021 Honda CRF450R?

    Front suspension travel is 12.2 inches, and rear suspension travel is 12.4 inches.

  9. 09

    How much did the 2021 Honda CRF450R cost new?

    The US MSRP was $9,599, plus a $380 destination charge.

  10. 10

    What size tires does the 2021 Honda CRF450R use?

    80/100-21 front and 120/80-19 rear.

  11. 11

    What spark plug does the 2021 Honda CRF450R take?

    NGK SILMAR10A-9S, gapped 0.031 – 0.035 in (0.80 – 0.90 mm).

  12. 12

    What chain and sprockets does the 2021 Honda CRF450R use?

    A 520 chain with 114 links on a 13-tooth front and 49-tooth rear sprocket.

Specs from Honda's owner's and service manuals, Honda's website and published spec sheets. Updated . Spot a mistake?

Other Honda CRF450R model yearsOther seasons

2021202220232024202520262027