12 | Rotax Needle Pin

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Needle Pin for Pinion Fixing on Rotax Max Evo engines.

This pinion holds the pinion gear that drives the water pump impeller to cycle water through the radiator jacket to keep the engine cool. This pinion is 4mm in diameter by 15.8mm, and is made of DIN 5402 hardened steel.

This is noted as part 12 in the diagram.