StephenRC45 wrote:Because everything was unleaded by the time the MC28 came out, in racing and on the road.

Not so Steve.

Our SS MC28 in '95 was running avgas with a 010 card. Then in '96 and also '97 in the Asia Championships (SP regs) we were allowed avgas.

We continued with the 010 card on the NSR. In '97 when we switch to the 3XV SPR the CDI had a bullet connector to switch between leaded and unleaded.