YFZ450R 2021 ATV

Taking ATV racing to the next level.

A race-bred assist and slipper clutch gives more precise control over corner entry speed for quicker lap times - while the race-bred engine delivers superfast throttle response and hard-hitting high rpm power for holeshot-winning performance.

Sharp-designed bodywork gives the rider space to shift the bodyweight during cornering or hard acceleration. And the lightweight piggyback shocks make for razor-sharp handling!

Available in:



  • Ultimate sports ATV with superior handling
  • Class-leading power-to-weight ratio
  • Lightweight chassis
  • Dual front discs with wave type rear disc
  • 5-valve 4-stroke single cylinder engine
  • Remote reservoir 3-way adjustable front shocks
  • Special graphics & quick release fasteners
  • 32-bit fuel injection for instant response
  • Lightweight weldless hybrid aluminium frame
  • Cast aluminium swingarm with piggyback rear shock
  • Quick-release fasteners for easy bodywork removal
  • Roomy bodywork and padded seat shape for comfort

ATVs with engines up to 70cc are recommended for use only by riders 6 years and older and always with adult supervision. ATVs with engines of 70 to 90cc are recommended only for use by riders 10 years and older, and always under adult supervision. ATVs with engines of 90cc or greater are recommended for use only by riders 16 years and older.

ATVs are built to operate within their design limits. Safe towable weights, together with maximum carrying capacity are identified in the owner's manual if applicable. For durability, reliability, but most important of all, operator safety, under no circumstances should the recommended capacities be exceeded. Yamaha recommends that all ATV riders take an approved training course.

For safety and training information, see your dealer or call your Yamaha Distributor in your country. ATVs can be hazardous to operate.


£9,299.00 inc VAT


Engine type

Single cylinder, Liquid-cooled, 4-stroke, DOHC, 5-valves



Bore x stroke

95.0 mm x 63.4 mm

Compression ratio

11.8 : 1

Maximum power


Lubrication system

Dry sump

Clutch type


Fuel system

Fuel Injection 42 mm EHS with ISC

Ignition system


Starter system


Transmission system

5-speed, manual slipper clutch

Drive system


Final transmission

Sealed O-ring chain, eccentric adjustment


Front suspension system

Independent double wishbone, Piggy Back 3-way adjustable damper, 250 mm stroke, threaded preload adjustable dual-rate coil-over springs

Rear suspension system

Cast aluminium swingarm, Piggy Back 3-way adjustable damper, threaded preload adjustable coil-over springs, 280 mm stroke

Front brake

Dual ventilated disc with hydraulic twin piston callipers

Rear brake

Wave-type ventilated disc with twin piston callipers

Front tyres


Rear tyres



Overall length

1,795 mm

Overall width

1,240 mm

Overall height

1,065 mm

Seat height

810 mm


1,270 mm

Minimum ground clearance

115 mm

Wet weight (including full oil and fuel tank)

184 kg

Fuel tank capacity

10.0 litres

Race-bred high-performance engine


The YFZ450R's race-bred 5-valve 4-stroke 450cc engine features a compression ratio of 11.8:1 and high performance camshafts for instant throttle response and race winning high rpm power. The Air Induction System gives high fuel effciency, reduced exhaust emissions and increased durability.

Electronic Fuel Injection


For sharp throttle response the YFZ450R is equipped with a 42 mm Mikuni throttle body which includes an ISC (Idle Speed Control) system for easy and reliable starting and warming up. This advanced system delivers instantaneous pick up and contributes towards reduced emissions.

Hybrid chassis engineering


The YFZ450R uses a special combination of aluminium and steel in its frame and swingarm construction, and this innovative 'hybrid chassis' offers a winning combination of low weight together with outstanding strenghth and an excellent rigidity balance. 

Assist and slipper clutch


The YFZ450R is the first ATV in its class to feature an assist and slipper clutch that's designed to partially disengage when you're downshifting quickly for a turn. By virtually eliminating the effects of engine braking,  the slipper clutch allows the rider to control corner entry speed, using the brakes for enhanced control and reduced lap times.

Slick-shifting transmission


The YFZ450R's 5-speed transmission is one of the slickets shifting systems in its class, and is fitted with an assistant slipper clutch - the first time this race-developed technology has been used in this category. The system makes shifting between gears even easier for quicker lap times and reduced fatigue.

Long-travel adjustable suspension


For reduced unsprung weight this model is fitted with Kayaba piggyback front shock absorbers and a calibrated rear shock. These adjustable unit give redefined handling performance to give you the edge over other competitors..