Cannot see why they would be illegal as the regulation reads : A dry, air-cooled centrifugal clutch of Noram, Horstman, Magnum, Maxtorque 1600 or 4000 series type (or any other clutch subsequently introduced which satisfies the same criteria), must be used to transmit the drive. The clutch should be in standard form (as supplied), be incapable of adjustment in position and have a maximum engagement speed of no more than 2,500 rpm engine speed. Taken from GX160PARTS.COM website under the regulations heading . Its the bit in brackets that I beleive make this clutch legal , it was probably written this way to make it so ...
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