| Designer | Massimo Tamburini | ||
| Production period | 1978 – 1981 | Production numbers | 15 |
| Power | 39 KW (53 PS) 47 KW (64 PS) | Displacement | 249 cc 349 cc |
| Topspeed | acc. to ratio | Weight | dry 95 kg |
| Price | 7.250.000 Lire (1978) | ||
| Technical basis | Yamaha TZ 250 / 350 |
In 1978, Bimota introduced the final evolution of the chassis for the Yamaha TZ 250 and TZ 350 engines. The frame of the YB2 underwent significant modifications, the most noticeable being the addition of extra gusset plates in the swingarm mounting area. Additional gusset plates also reinforced the connection between the upper and lower frame rails. A completely new feature was the dual-arm tubular swingarm, incorporating a triangular trellis structure as the upper brace.
The YB3 was offered in 1978 for 6,900,000 lire, which, at the exchange rate at the time, was approximately 3,100 Deutsche Marks. A kit consisting of the frame, swingarm, wheels, fuel tank, and fairing was available for 2,800,000 lire, or about 1,200 Deutsche Marks.
In 1980, Jon Ekerold won the 350cc World Championship with the YB3. In several legendary races, he battled fiercely against Toni Mang on a Kawasaki, who ultimately became the runner-up. The championship was only decided in the final race of the season at the Nürburgring after an intense head-to-head duel.
Bimota’s success was not only evident in winning the world title but also in the overall standings of the 350cc championship. Johnny Cecotto finished in 4th place, Eric Saul in 6th, Massimo Matteoni in 8th, Jean-Louis Tournadre in 20th, and Loris Reggiani in 21st—all riding motorcycles with Bimota chassis.
