{"product_id":"unassembled-flywheel-set-3-31-32-stroke-for-55-e81-big-twin-nu","title":"Unassembled Flywheel Set 3-31\/32\" Stroke For 55-E81 Big Twin NU","description":"\u003cp\u003eUnassembled \u0026amp; unbalanced flywheel set. Flywheels have the stock 8-1\/2\" diameter and are compatible with the flywheel scrapers found in both stock and S\u0026amp;S crankcases. Compatible with S\u0026amp;S Sprocket shaft assemblies: - 512401 55-64 B.T. with S\u0026amp;S SE \u0026amp; SL flywheels only - 512402 65-69 B.T. with S\u0026amp;S SE \u0026amp; SL flywheels only - 512403 70-99 B.T. (excl. Twin Cam) with SE \u0026amp; SL flywheels only. S\u0026amp;S Crankpin assemblies: 512469 Std. 1.249\" OD. 41-E81 B.T. Repl. 23961-41. 512471 +.001\" 1.250\" OD. 41-E81 B.T. 512472 +.002\" 1.251\" OD. 41-E81 B.T. S\u0026amp;S Pinion shaft assemblies: 518010 39-53 FL with OEM or S\u0026amp;S E flywheels. Repl. 24007-39. 512404 58-E81 B.T. (See ''Note 1'' for 54-57 models). Note sprocket shaft: OEM sprocket shafts will not fit the 6ø taper that S\u0026amp;S flywheels have; apart from 81-85 stock style B.T sprocket shafts (OEM 23909-80 \/ MCS 502615 and 502616). These will fit S\u0026amp;S flywheels but do not have the keyway that S\u0026amp;S sprockets shafts have. The woodruff key eliminates spinning of the sprocket shaft in the left flywheel. Note1: 58-81 B. T. pinion shaft assemblies also fit 54-57 B.T. when the stock pressed-in bearing race is removed and the cast-in bearing retainer is bored out to accept the larger 58-81 press-in bearing race (OEM 24599-58B \/ MCS 518110).Note: Special Order Product only. To order please contact your MCS sales representative.\u003c\/p\u003e\u003cp\u003e55-E81 Big Twin (NU)\u003c\/p\u003e","brand":"S\u0026S","offers":[{"title":"Default Title","offer_id":56019899646331,"sku":"708930","price":494.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0648\/6881\/0972\/files\/moto-central-coming-soon_dfb75c55-d732-46a2-9b43-694acc4acd49.jpg?v=1769175992","url":"https:\/\/motosuperstore.co.uk\/products\/unassembled-flywheel-set-3-31-32-stroke-for-55-e81-big-twin-nu","provider":"Moto Superstore","version":"1.0","type":"link"}