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Exactly!! Obviously, you cannot use a 100cc head on an engine bored to Extreme as that is illegal. As long as the 100cc engine conforms to the TKM regs, it is perfectly legal to use it in Senior racing. I don't think that it is 3bhp down on Senior though. My son, who is moving into Seniors this year, can equal and even beat Seniors time with his 66** series BT82, even with a restrictor, at Blackbushe and he is only 4 kg under the Senior limit. As he is continuing with NatSKA aswell, we will be keeping his 100cc engine as a backup, in case there are any problems with his Extremed engine during MSA racing, hence my answer to the original question.
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