Thanks I found it. I had clicked on everything but the top part.
This is what Tim and I were talking about.
3 Wheelers Vintage A ( Age 14+) Trophy (NON Points- exhibition class) Must have 5 or more riders to run this class separately or can be combined with 3 Wheeler Open Class. Vintage A - Vintage means, "of the era", no modern motors or conversions, as well as upper displacement limitations on any machine to stock 250/350X cylinders with over bores. All machines should maintain the spirit of the class!
That's why I thought there were no strokers. But now answer me this, do I read into this that the 350x can be bored up to .080 over in this class but you can't bore a 350x at all in the lites class?