RX
4T 450

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The ultimate expression of 4-stroke power in the world of motocross according to Beta. The RX 450 4T is designed for those who want powerful thrust, managed by advanced electronics that include four-level Traction Control, to deliver all the power to the ground in all conditions.

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449,3 CC

Displacement

97 mm

Bore

104,5 kg

Dry weight

335 mm

Ground clearance

main features

ELECTRONICS

Traction Control: power under control.

The power of the 450 4T engine requires advanced control. Traction Control, which can be disabled and adjusted to four levels, allows you to adapt the response to any track condition, ensuring maximum traction and confidence to open the throttle without hesitation.

TWO ENGINE MAPS

The two engine maps (dry and wet) work in synergy with Traction Control to offer a complete electronic package. You can quickly and intuitively customise the engine’s character, always finding the perfect setting for the track and your riding style.

CUSTOMIZABLE THROTTLE RESPONSE

The RX 450 4T comes with four different throttle pulleys. Customize the throttle response, from more aggressive and immediate to smoother and more progressive, for a bike that’s tailored to you.

4-STROKE-SPECIFIC VEHICLE

The frame and Kayaba suspension feature specific settings designed to suit the weight distribution and power delivery of the powerful 4-stroke engine. The result is a perfect balance between the agility needed for cornering and the stability required at high speeds.

NISSIN BRAKING SYSTEM

To master the power of the 450, you need a braking system that’s up to the challenge. The Nissin system offers the power and sensitivity needed to ensure sharp braking and precise control, allowing you to manage your speed with absolute confidence.

RADIATORS

A high-performance 4-stroke engine generates considerable thermal stress. The reinforced radiators are sized to ensure optimal cooling even in the most extreme racing conditions, ensuring consistent performance from the first lap to the last.

EXHAUST

The HGS racing exhaust system has been developed specifically for the characteristics of the 450 4-stroke engine. It optimises the power curve, ensuring a responsive low-end and exceptional top-end performance, all with an unmistakable sound and reduced weight.

HANDLEBAR SILENT BLOCKS

The silent blocks on the handlebar are useful for dampening the vibrations of a high-performance 4-stroke engine. They increase comfort and reduce fatigue, allowing you to maintain full control and maximum concentration for longer.

POWER AND INTELLIGENCE: THE WINNING COMBINATION

The RX 450 4T is the result of the combination of two fundamental elements: the overwhelming power of its 4-stroke engine and the intelligence of a top-level electronic package. Four-level Traction Control, two engine maps and the ability to customise throttle response work together to give you full control, allowing you to transform the engine’s horsepower into pure speed and winning performance.

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manual brochure

CHASSIS

FRAME

Molybdenum steel with double cradle split above the exhaust port

Wheelbase

1475 mm

Max length

2170 mm

Max width

830 mm

Max height

1270 mm

Seat height

945 mm

Ground clearance

335 mm

Footrest height

422 mm

Dry weight

104,5 kg (front 51,4 kg; rear 53,1 kg)

Fuel tank capacity

7,0 l

Cooling system capacity

1,4 l

Front suspension

Hydraulic USD closecartridge fork with ø 48 mm shaft

Rear suspension

Monoshock with progressive compound lever

Shock absorber stroke

133 mm

Front wheel travel

305 mm

Rear wheel travel

300 mm

Front brake

Wave disc ø260 mm and double-piston floating caliper

Rear brake

Wave disc ø240 mm and single-piston floating caliper

Front rim

21 x 1,6 – 36 holes

Rear rim

19 x 2,15 – 36 holes

Front tyre

80/100 – 21

Rear tyre

110/90 – 19

ENGINE

Type

Single cylinder, 2-stroke, liquid-cooled

Bore

97 mm

Stroke

60,8 mm

Displacement

449,3 cc

Compression ratio

13,5:1

Valve train

DOHC finger follower / 4 valve, intake titanium, exhaust steel

Starter

Electric starter

ACG

Mitsuba

Spark plug

NGK LKAR 8A-9

Fuel system

Elldor electronic injection

Lubrication

2 oil pumps

Throttle body

Ø 46 mm

Clutch

Wet multi-disc clutch

Primary drive

Z. 31/72

Transmission

5 gears

Final transmission

Chain

Engine oil

SAE 10W/50 0,8 l. + SAE 10W/40 0,8 l.

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