I agree with this on the 250 version of the bike as they are mechanically identical except for some minor details and the previously mentioned left/right gear change position. Today, with the exception of Peter Lawson in WA and one or two other anal retentive officials, most people turn a blind eye to the Mk8 250 as long as the Mk7 swingarm is used or the Mk8 version is retro modified back to Mk 7 specs. That's allowed as long as the correct number cases are still used. Many Bultaco riders converted their Mk 7 right foot change bikes over to left foot change using Mk8 parts. At a national level, Mk8s were not permitted at all. Depending on the importance of the race meeting, many organisers turned a blind eye to MK8 Bultacos fitted with MK7 swingarms basing their decision on the assumption that the only difference between the models is the back suspension and the placement of the gear lever. However, after much consultation with Bultaco experts all over the world we acepted the fact that the Mk8 is actually the factory designated 1975 model, no matter when it was purchased. The main bone of contention was that the Mk8 was released in 1974, as many an owner and even Kevin Fraser, the big NSW dealer of the time argued. This particular model caused more drama in the early days of VMX than any other bike. In a nutshell, the Mk8 Bultaco is ilegal for pre '75.

Bultaco pursang 1975