Then can't the jetting just be changed to suit??

I must have misunderstood.. What exactly does the 'power' part of the graph refer too??

I take it some may have heard about Nology leads and silver spark plugs.. Would folks also say that these would be bad news for the motor as they create more spark and in turn more heat?? But would it not come back to jetting to suit??
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MC18 Race bike project..
MC21 Race bike..