I believe there has been a slight oversight in the 4 stroke rules, in that they allow 4 strokes upto 1981 with only 2 valves per cylinder.....

The 2 valves per cylinder rule is presumably to stop really fast 'modern' japanese bikes from racing, but it will also prevent Weslake/Nourish twins, this seems a ridiculous rule as the weslake twin is perfectly eligible for classic and post classic racing everywhere else.

It also seems unfair to Dave Nourish who will no doubt lose buisness as somebody choosing a classic superbike would now more likely choose a triple as it can be raced in the manx.

I believe the rule should state '2 valves per cylinder except in the case of the weslake twin'