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Debaffled stock pipes: 45 pilot, 140 main. Add two shims to existing shim(total 3), on bottom side of stock needle. Mixture screw 2.5 turns. Be sure to plug secondary air port as per Thunder. It is under the round intake (venturi) housing. Be cautious, as this is held in by two brass screws that have been blue loctite in by the factory

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