The 2019 wording is posted on the BMST site and reads:
"2. F. FUELS Acceptable fuels include alcohol, methanol, ethanol, nitrous oxide, nitro-methane, hydrogen, diesel and any. Violation of this fuels section is grounds for disqualification."
What needs clarification is the first sentence, which appears unfinished with "…. diesel and any."
Why is a Brit interested? Because at the Straightliners/UKTA events held in Britain, we allow bike racers who have been to or are going to BMST to run on our airfield and beach tracks with machines built to the AMA Bonneville rules.