Deon, interesting purchase. Do you know how many miles are on the crank? I read that the SPL has a unique crank to accomodate the SPL ignition, if so expect spare cranks to be pretty rare. Even standard NF5 cranks are very hard to find, also original pistons.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30