Duplex just means it features a double row timing chain which is much stronger and therefore more reliable, than the single row chain system fitted as standard. Always replace the cam followers when changing the camshaft. The amount of weight that the camshaft has to lift each time restricts the revving capabilities of the engine, therefore the use of lighter, tuftride hardened, cam followers is recommended. The lighter variety reduce loading, and thus increase the life of the camshaft lobes.
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