Burdekin Motorcycles
TYPE – Single cylinder 4 stroke liquid cooled
BORE – 97 mm
STROKE – 60.8 mm
DISCPLACEMENT – 449.3 cc
COMPRESSION RATIO – 13.4:1
VALVE TRAIN – DOHC finger follower / 4 valve, intake titanium, exhaust steel
STARTER – Electric starter
IGNITION – AC Kokusan – Digital CDI
SPARK PLUG – NGK LKAR 8A-9
THROTTLE BODY – 46 mm
FUEL SYSTEM – Elldor electronic injection
LUBRICATION – 2 oil pumps
CLUTCH – Wet multi-disc clutch
PRIMARY DRIVE – Z.31/72
TRANSMISSION – 5 gears
DRIVE – Chain
ENGINE OIL – SAE 10W/50
FRAME – Molybdenum steel with double cradle split above the exhaust port
WHEEL BASE – 1485 mm
MAX LENGTH – 2170 mm
MAX WIDTH – 825 mm
MAX HEIGHT – 1270 mm
SEAT HEIGHT – 945 mm
GROUND CLEARANCE – 330 mm
FOOTREST HEIGHT – 410 mm
WEIGHT (DRY) – 104.5 kg (Front 51.4 kg / Rear 53.1 kg)
FUEL TANK – 7 L
RESERVE – 1.4L
FRONT SUSPENSION – 48 mm KYB AOS Closed Cartridge with adjustable compression & rebound
REAR SUSPENSION – KYB 50 mm body with adjustable rebound and high/low speed on compression adjustment (135mm stroke)
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 × 1,6 – 36 holes
FRONT TYRE – 80/100 – 21
REAR RIM – 19 × 2.15 – 36 holes
REAR TYRE – 110/90 -19
Beta Motorcycles Australia is excited to announce the release of the MY2024 Beta RX 450.
In 2023, Beta’s project to expand the horizons of RideAbility officially entered the motocross market in Europe, first with the RX 300 two-stroke and now with the king of motocross bikes, the RX 450 four-stroke!It is officially the first four-stroke motocross bike built by the Italian manufacturer; for enthusiasts of all riding abilities, this translates into the first chance to ride the Beta MX bike that is based off of the race prototype that competed in the MXGP World Championship for the last three years.
A race-ready bike in all respects, specifically designed for motocross tracks, the design is completely new from the ground up: the frame, engine and all of the components are of the highest level, and developed with the project brief in mind: to bring new horizons of RideAbility to the MX world.What does RideAbility mean for Beta? It means to design a MX model that appeals to riders of all levels. Beta motorcycles are designed by a team of engineers based in Florence, Italy with a mission to provide all riders with a motocross bike that is easier to ride, while still providing the highest level of performance.
Debuting in the MXGP circuit just a few years ago, the RX 450 prototypes have provided the knowledge that can only come from top-level racing. These early one-off models provided the base layout and design for the production model and will see the RX 450 4T joining its younger brother the RX 300 2T on race tracks all over the world.
The technical design of the RX 450 is totally new and features:Frame: designed from the ground up as an all-new frame that is specifically designed and dedicated for motocross use. The main spar of the frame is wider in design to withstand the stresses from repeated landings, making it much stiffer overall, yet supple enough for cornering. This translates into a precise chassis that provides a planted feeling in corners and a light feeling while in the air.
Rear sub-frame and filter box: The RX 450 has a new aluminium rear sub-frame which provides rigidity to the bike despite its light weight, providing the strength needed for the demanding needs of motocross. This new component is perfectly integrated with the new air filter box and is all-new for the RX 450. The new filter box and air intake, combined with the new 46 mm throttle body, provide a significantly different air flow than that required by an enduro bike, creating optimum air flow to keep up with the performance of the new engine. Access to the filter remains on the left side of the bike, and is extremely easy and intuitive, as well as being tool-free.
Plastic parts: while the front shrouds, recently redesigned for RR models as well, remain unchanged in their form, the rear features a new sleek and aggressive tail which, not being a structural component, fits into the new aluminium rear sub-frame and, as previously mentioned, allows access to the filter box via a convenient connection. The fuel tank is a smaller design and has a capacity of seven litres.Fork and Shock: Kayaba, with 48 mm stanchions at the front and 50 mm piston at the rear. Both components are completely adjustable, and represent an ideal compromise between rideability and performance, thanks to continuous development on the track. The main difference in the suspension compared to the enduro models is the greater travel of the front fork, with specific calibration for motocross, while the shock is completely new. The shock is larger than the one the RR models are equipped with, which provides greater support on landings thanks to greater hydraulic damping, and more consistent performance with demanding use.
The blue anodised wheels are 21” at the front and 19” at the rear, with 90/100-21 and 110/90-19 Maxxis tyres, while the braking system is by Nissin with floating callipers and a 260mm disc on the front and 240mm at the rear. The front brake calliper is a smaller