Speedo Seats & Luggage- racks Frame Chassis Suspension Forktubes Wheels Brake Fenders Gastanks Motorparts Gaskets Intake Transmission & Driveline Exhaust Electrical & Lights Handlebars, Cables & Mirrors Oil tanks Oil & Chemicals Fasteners Windshields Forward controls, Footpegs Miscellaneous MOTOR PARTS - TOP END 10 685 AFTERMARKET PARTS & ACCESSORIES FOR CUSTOM MOTORCYCLES / MOTORCYCLESTOREHOUSE.COM 37-48 FLATHEAD 1200 & 48-52 PANHEAD 1000CC 3-5/16" piston ring set with 3/32" (.09375") parkerized compression and 3/16" (.186") 3-piece oil rings. Fits 37-48 74" (1200cc) U, UL model Flatheads and 48-52 61" (1000cc) E, EL Panhead models. Std bore: 3-5/16" (84.138mm) 1st ring: 2.38mm 2nd ring: 2.38mm oil ring: 4.75mm 946470 S.T.D. NA .020" 946473 .030" NA .040" NA .050" NA .060" NA .070" FLATHEAD 750CC (1950-1973) & K, KH MODELS Used with late style 1950-1973 type pistons with 3-piece flex-vent style oil ring. Also fits 52-56 K 45" (750cc) and KH, KHK 55" (900cc) Flathead models. Std Bore: 2.745" (69.723mm) 1st ring: 1.6mm (1/16) 2nd ring: 1.6mm (1/16") oil ring: 4.75mm (3/16") 946452 S.T.D. 946453 .010" 946454 .020" 946455 .030" 946456 .040" 946457 .050" SHOVEL, PAN, KNUCKLE 41-E78 1200CC Std cyl. bore: 3.4375" (87.312mm) 1st ring: 1.6mm 2nd ring: 1.6mm oil ring: 4.75mm 908440 S.T.D. 908445 .010" 908450 .020" 908455 .030" 908460 .040" 908465 .050" 908470 .060" 908475 .070" SHOVEL L78-84 1340CC Std cyl. bore: 3.498" (88.85mm) 1st ring: 1.6mm 2nd ring: 1.6mm oil ring: 4.75mm 908530 S.T.D. 908531 .005" 908535 .010" 908540 .020" 908545 .030" 908550 .040" SHOVEL BIG BORE 3-5/8" Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm) 1st ring: 2.0mm 2nd ring: 2.0mm oil ring: 4.75mm 908555 S.T.D. 908560 .010" 908570 .030" 908575 .040" Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Measuring cylinder oversize Measuring the current size of cylinders should always be done at its smallest diameter, which is the lowest part of the cylinder. Because the lowest part is seldom worn much, oversize piston rings should never be used unless the cylinders have been rebored to the standard oversize. Information provided by Hastings Manufacturing Company, Inc. inches to millimeters You already knew this, but for the other guy: Multiply Inches x 25.4 = millimeters (mm) tech-tip 37 HASTINGS® PISTON RINGS Hastings® piston rings are sold in sets for one or two pistons. Check your pricelist or our website for quantity. 74" PAN & SHOVEL 74" FLATHEAD & 61" PAN 45" FLATHEAD & 55" KH Compression ring gaps To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure, possibly breaking rings and/or damage to pistons and/or cylinder walls, and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or, when rounded of, 0.37mm). Information provided by S&S Cycle, Inc. tech-tip 35 Selecting oversize rings Oversize piston rings should never be used unless the cylinders have been rebored to the standard oversize of the piston rings. Cyl. bore diameter: Use ring size: Std to +.009" Std or .005" (.005" after honing) +.010" to +.019" .010" +.020" to +.029" .020" +.030" to +.039" .030" etc. Information provided by Hastings Manufacturing Company, Inc. tech-tip 36 Early and Late 45" Flathead piston rings 750cc (45") Flathead pistons & rings come in two versions, an early and and improved late style with thinner compression rings and modern flex-vent style oil rings. Below you'll find the differences. 'Late' OEM 1950-1973 45" pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and 3/16" (4.75mm) 3-piece flex vent style oil rings. 'Early' OEM 29-49 45" pistons are equipped 3/32" (2.38mm) 1st & 2nd rings and 1/8" (3.2mm one-piece oil ring). Both 'early' as 'late' style rings are available as Hastings. Check our Hastings Rings section. tech-tip 38 FLATHEAD 750CC (1929-1949) 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") 946144 S.T.D. 946145 .010" 946146 .020" 946147 .030" 946148 .040" Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and 3/16" (4.75mm) oil ring, for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons.
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