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Briggs & Stratton Vertical OHV Engine — 724cc, 1 1/8in. x 4 19/64in. Shaft, Model# 44S977-0033-G1 | Northern Tool
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Amazon.com: Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1" x 3-5/32" #31R977-0054 : Patio, Lawn & Garden
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Briggs & Stratton Intek 500cc 17.5-HP Replacement Engine for Riding Mower in the Replacement Engines department at Lowes.com
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