The 1984 Bimota SB4 and KB3 shared a common frame and running gear with different engine mounting plates for the Suzuki GS1100 engine or Kawasaki KZ1000 engine. Different subframes were also made to make use of either Suzuki or Kawasaki gauges. With fiberglass bodies, complex small tube space frames, and top notch suspension components, these bikes weighed about 80lbs less and had wheelbases about 5 inches shorter than the bikes the Suzuki and Kawasaki bikes which donated their engines. The result of the weight savings and race dimension frame, and high end suspension components made these bikes the highest performance street bikes available when they were produced.

 

This bike is a wrecked SB4 which Nick Ienatsch of Motorcyclist Magazine acquired and rebuilt using his industry connections to make a super high performance custom. It was featured in the September 1992 issue of Motorcyclist Magazine. The engine is a Kawasaki 1000cc built big block with 1260cc of displacement, dual plug heads, undercut transmission, headwork, and cams breathing through Mikuni flat slide carbs. The use of the Kawasaki engine effectively makes the bike a KB3. Roland Sands of Performance Machine built custom wheels and brakes for the bike while the suspension retains the stock Ceriani forks along with a Works Performance shock. Paintwork is a custom tricolore scheme applied by Gerard Designs. Mike Worshum of Mike Worshum Machine Works created the engine mounts and a host of hardware, brackets and subframe necessary to complete the machine and did the majority of assembly.

 

In 2026 a complete restoration and reworking of the bike was completed by Paul Murphy of Meticulous Moto Restorations. The reworking refined the finish and function of the machine to complete Bimota spec while keeping it true to the original build. While the paint was left original, ever other component of the bike was refinished or replaced to bring the cosmetics of the bike back to what it was when it was built in 1992. The undercut transmission, which was suited to drag racing was replaced with an original transmission more conducive to street sport riding, all the fasteners were refinished and/or replaced with Bimota correct  fasteners, the electrics were reworked to restore full function and add turn signal and neutral indication and broken/missing parts like the upper fairing support were added. All told some 400 hours of work was put into the bike to bring it back to better than built condition.