Ultimately the MSA, I suppose. But I presume the MSA itself takes precious little interest in that sideshow called karting and instead just rubber stamps the lead it’s given from within karting. That is of course unless a company with clout like that of BRP has were to come along and say “sanction this or else”. Am I wrong? Funny thing is, allowing ICC and not allowing Aixro is the equivalent of saying “You’re welcome to run red, 12-cylinder Ferraris on track days, but a yellow, 10-cylinder Lamborghini? Forget it!” I’m not aware of them doing that with respect to cars, but then car products generally have large companies with potent legal departments behind them to pre-empt such anti-competitive rulebooks.
Having said that, I’m not sure I see the appeal in running either ICC or Aixro on long circuits. While it may initially be a bit of a blast, surely just running flat-out most of the time would get a bit monotonous? Plus I wonder how good prolonged high-rev running would be for either of these types of engine; except that the owner of a 125cc 2/ gearbox engine would expect to rebuild his motor every 5 minutes anyway.
There used to be – last I heard of this was 2 to 3 years ago – a company that organized kart track days on a section of the modern Nürburgring with “classes” for all manner of karts from juniors through to 1000cc motorcycle engine concoctions.
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