KB4

Vintage Inspired

A timeless tribute to bimota’s storied past, the KB4 fuses neo-retro elegance with modern precision. Its lightweight handling and legendary racing spirit meet the thrilling pulse of a 142 PS engine. Thanks to its innovative rear radiator layout, the KB4 achieves a short wheelbase akin to that of a 250cc machine, enhancing agility and performance. The fourth-generation KB4 proudly carries the legacy of the KB name, blending tradition with cutting-edge innovation. Designed for the streets, it captures the soul of a cherished era while delivering exhilarating modern performance. Ride the legacy. Experience the evolution.

Innovative Design

The whole of the KB4 is unique, its innovative exterior unseen anywhere else. The design is instantly recognisable as “bimota” and “KB4.”

Light Weight

One example of function pursued to its extreme is the KB4’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.

Rideable Art

Down to the smallest detail, the KB4 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 KB4 rideable art.

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

194 kg* / 427.70 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

KB4

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

2.050 mm (80.70 in)

Overall width

774 mm (30.47 in)

Overall height

1.150 mm (45.27 in)

Ground clearance

140 mm (5.51 in)

Seat height

810 mm (31.89 in)

Wet weight

189 kg* / 416.67 lb

*Dry weight with all liquids except fuel, no accessories

Curb mass

194 kg* / 427.70 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

A Machine That Stirs The Senses

Every time you approach a corner, your heart is captivated by the refined handling. Twist the throttle and the smooth, powerful response stirs your senses.

For bimota, passion is what the rider should feel when controlling the bike. That same passion should also be felt when admiring it parked in the garage.

In either case, the KB4 stirs your senses.

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 KB4 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 KB4 delivers a riding experience perfectly in tune with the rider's intentions.

Retro Style Meets Modern Performance

The KB4 combines retro aesthetics with the performance of a modern sportbike. Aerodynamically efficient winglets, lightweight carbon-fibre bodywork, and a slim tail cowl evoke bimota’s spirit of racing, highlighting 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.

Nimble Handling

The KB4’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 KB4 to respond exactly as the rider wishes as they trace their intended line through the corner.