KB4RC

Racing Freedom

The KB4RC embodies racing freedom with its compact, super short-wheelbase frame and a 142 PS engine that delivers exhilarating power and laser-sharp handling. Carrying the spirit of a café racer, bimota’s unmatched craftsmanship meets cutting-edge performance, offering unrivaled agility and grin-inducing torque. Every metal part is meticulously machined from billet to ensure precision and quality. The KB4RC allows you to experience the pure, unrestrained spirit of racing. Feel the thrill of control, where innovation and power converge—this is freedom, unleashed.

Rideable Art

Down to the smallest detail, the KB4RC exudes high quality—from the carbon-crafted paintwork and machined alloy parts to OZ Racing forged wheels and a real leather seat. Its torqueful engine and advanced electronics further reflect the same standard. It is no exaggeration to call the KB4RC rideable art.

Innovative Design

The KB4RC bimota is unique, with an innovative aesthetic never seen before.
The design is instantly recognizable as bimota and "KB4RC".

Maximum lightness and extraordinary agility

One example of function pursued to its extreme is the KB4RC’s light weight. To achieve this, both weight reduction and a chassis design that does not let the rider feel its weight were pursued. The result is light, nimble handling in a compact package.

Technical Information

Max. Power

104.5 kW /

142 hp @ 10.000 r/min

Max. Torque

111 Nm / 81.87 lbf-ft

@ 8.000 r/min

Curb Mass

191 kg* / 421.08 lb

*Curb mass includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent capacity) and tool kit (if supplied)

Show All Specifications

KB4RC

Technical Information

Engine

4-stroke, 4-cylinder, DOHC, 4-valve, liquid-cooled

Displacement

1.043 cc / 63.65 cu-in

Bore x Stroke

77.0 x 56.0 mm / 3.03 x 2.20 in

Compression ratio

11.8:1

Power

104.5 kW / 142 hp @ 10.000 r/min

Torque

111 Nm / 81.87 lbf-ft @ 8.000 r/min

Fuel system

DFI® (Digital Fuel Injection) 4 x Ø 38 mm throttle bodies, oval secondary throttle valves

Euro5

CO2 emission

159 g/km,

Fuel consumption

5.5 l/100km

Ignition

Digital

Ignition timing

10°BTDC @ 1.100 r/min - 40.2° BTDC @ 5.200 r/min

Spark plug type

NGK CR9EIA-9

Gap: 0.8 - 0.9 mm / 0.031 - 0.035 in

Starting system

Electric starter

Firing order

1-2-4-3

Lubrication system

Forced lubrication, wet sump

Engine oil type

API SG, SH, SJ, SL or SM, with JASO MA, MA1 or MA2

Viscosity: SAE 10W-40

Capacity: 4.0 L (4.22 US qt)

Coolant capacity

2.5 L (2.64 US qt)

Transmission

6-speed, return shift

Clutch

Wet, multi-disc, manual

Final drive

Sealed chain drive

Primary reduction ratio

1.627 (83/51)

Final reduction ratio

2.733 (41/15)

Overall drive ratio

4.925 (Top gear)

Gear ratio

1st: 2.600 (39/15)

2nd: 1.950 (39/20)

3rd: 1.600 (24/15)

4th: 1.389 (25/18)

5th: 1.238 (26/21)

6th: 1.107 (31/28)

Front suspension

Öhlins front fork FG R&T 43 NIX30, compression and rebound damping adjustability, adjustable spring preload, with top-out spring

Wheel travel 130 mm (5.11 in)

Rear suspension

Aluminum alloy billet swingarm, Öhlins TTX36 nitrogen gas-charged shock with piggyback reservoir, compression and rebound damping adjustability, hand-adjustable spring preload, top-out spring

Wheel travel 122 mm (4.80 in)

Front brakes

Dual radial-mount, opposed 4-piston Brembo Stylema® calipers, dual semi-floating 320 mm discs, KIBS ABS

Rear brake

Opposed 2-piston Brembo caliper, single 220 mm disc, KIBS ABS

Frame type

Front frame trellis Hi-tensile steel, aluminum alloy billet plates

Rake/Trail

24.0° / 100.8 mm (3.96 in)

Overall length

2.040 mm (80.31 in)

Overall width

773 mm (30.43 in)

Overall height

1.060 mm (41.73 in)

Ground clearance

130 mm (5.12 in)

Seat height

810 mm (31.89 in)

Wet weight

187 kg* / 412.26 lb

*Dry weight with all liquids except fuel, no accessories

Curb mass

191 kg* / 421.08 lb

*Curb mass includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent capacity) and tool kit (if supplied)

Fuel capacity

19.5 L / 5.15 gal

Wheelbase

1.390 mm (54.72 in)

Tire size

Front: 120/70ZR17 M/C (58W)

Rear: 190/50ZR17 M/C (73W)

Rim size

Front: J17 M/C x MT 3.50

Rear: J17 M/C x MT 6.00

Technology

IMU-Enhanced Chassis Orientation Awareness, Kawasaki Cornering Management Function (KCMF), Kawasaki Traction Control KTRC (3-MODE), Power Modes, Brembo Stylema Calipers, Öhlins Steering Damper, Kawasaki Intelligent anti-lock Brake System (KIBS), Kawasaki Quick Shifter (KQS) (upshift & downshift), All Led Lightning, Full-Colour LCD TFT screen, Electronic Cruise Control, Assist & Slipper Clutch.

Engineering Excellence Meets Striking Design

Easy to Ride

With the KB4RC, we were inspired by the idea of a bike that was easy to ride, with good torque, and light weight inherited from the KB4. The target to achieve this was “Freedom.”
By making the perfect match between the rider and their riding style, and enabling the rider to freely adjust the riding position to suit their size and preference, we were able to realise a superb handling bike with a strong character.

Neo-Retro Naked Meets Modern Performance

The KB4RC combines authentic round headlights and naked bike aesthetics with the performance of a modern sportbike. Lightweight carbon-fibre bodywork, slim tail cowl, and red trellis frame visible between body panels highlight this bike’s unique blend of performance and design. The single-piece seat offers sporty ergonomics, while the OZ Racing forged aluminium alloy wheels contribute to nimble handling.

Under-Seat Radiator System: The Key to Ideal Weight Distribution

In order to achieve bimota's ideal front-rear weight distribution (54/46), the radiator is located under the seat allowing the engine to be positioned farther forward. Also, the KB4RC combines a short wheelbase (equivalent to that of a 250cc class bike) with a long swingarm, achieving both agile handling and outstanding traction.
More agile, more flexible. The KB4RC delivers a riding experience perfectly in tune with the rider's intentions.

Nimble Handling

The KB4RC’s frame is a composite structure typical of bimota. At the front, a trellis frame connects the engine with the steering head, while a plate machined from a single block of aluminium alloy connects the engine to the swingarm at the rear. This unique, highly advanced structure achieves both high rigidity and a compact shape.
The combination of this frame structure with Öhlins suspension and Brembo brakes is the key to nimble handling, allowing the KB4RC to respond exactly as the rider wishes as they trace their intended line through the corner.

Engine Incorporating Advanced Electronics

The KB4RC features Kawasaki's 1,043 cm³ liquid-cooled 4-stroke In-Line Four engine delivering 142 PS and excellent response in the low-rpm range. In addition, KB4RC riders are supported by a suite of the latest electronics.

High-Tech Cockpit and Ergonomics

At the centre of the cockpit is TFT colour instrumentation displaying detailed riding information. The riding position can be fine-tuned thanks to an adjustable ride height and adjustable footrests, while a stress-reducing quick shifter allows riders to get the most from their KB4RC.