{"product_id":"hastings-2-745-bore-piston-ring-set-040","title":"Hastings, 2.745\" bore piston ring set. +.040\"","description":"\u003cp\u003eComes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring.  Std cyl. bore: 2.745\" (69.72mm).  1st ring: 2.3mm (3\/32).  2nd ring: 2.3mm (3\/32'').  Oil ring: 3.2mm (1\/8\").   Note: OEM 1950-1973 pistons are equipped with 1\/16\" (1.6mm) 1st. \u0026amp; 2nd rings and late style 3\/16\" (4.75mm) 3-piece flex-vent style oil rings for improved oil control; for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons.  Tech tip: Piston grooves vs piston rings.  It''s not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings; the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.  Tech tip: Piston oversizes.  For each oversize cylinder diameter will increase with .010\" (0.254mm). The standard bore of the cylinder is listed for reference.  (Tech tip information provided by Hastings Manufacturing Company; Inc.)\u003c\/p\u003e","brand":"Hastings","offers":[{"title":"Default Title","offer_id":52760749834568,"sku":"946148","price":127.9,"currency_code":"EUR","in_stock":true}],"url":"https:\/\/holydeath.com\/fr\/products\/hastings-2-745-bore-piston-ring-set-040","provider":"Holy Death Motorcycle Co.","version":"1.0","type":"link"}