{"product_id":"mcs944774","title":"KB Performance Piston 1340 Evo B.T. Forged Piston Kit. STD – 1984–1999 Evo Big Twin","description":"\u003ch2\u003eKB Performance Piston 1340 Evo B.T. Forged Piston Kit. STD – 1984–1999 Evo Big Twin\u003c\/h2\u003e\n\u003cp\u003eForged piston set. 9.5:1 CR with 80cc head. Piston weight 365gr. Piston pin weight 97gr. Piston pin dia. .792\" \/ offset. Head type: Dome with -8.5cc. Compression height 1.375\". Bore 3.4980\". Stroke 4.250\". Rod length 7.440\". Cyl. length 5.550\". All KB forged pistons are made from 4032 alloy; a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level; after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation; or pre-ignition; giving the best resistance to cracking. Although 4032 has a low expansion rate; it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001\" wider piston to wall clearance. Pistons are sold as sets; complete with wrist pin retaining rings; wrist pins and piston rings. Note; All KB forged pistons come equipped with offset wrist pins \/ piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions; as provided with the piston set; prior to installation.\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e84-99 Evo Big Twin (NU)\u003c\/p\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e KB Performance Piston\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e MOTOR PARTS \u0026gt; PISTONS AND RINGS KITS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit:\u003c\/strong\u003e SET\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct code:\u003c\/strong\u003e 944774\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KB-Performance Piston","offers":[{"title":"Default Title","offer_id":57378702983555,"sku":"MCS944774","price":300.31,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/944774k_dfed8023-f0d3-41de-8be5-ab5ffd0f38c9.jpg?v=1775575521","url":"https:\/\/hogparts.com\/products\/mcs944774","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}