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I dont see why a steel crank shouldn't be used, as they do in the states.
Not only will the engine be more reliable, but should save the necessity for new blocks, conrods, cams,etc.etc.
Although you would then in theory be able to use more revs, in practice the revs are governed by the vagaries of valve gear float.
So more expensive for a steel crank, but cost recouped very quickly I would think.
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