WINDSHIELDS & FAIRINGS AUDIO, COMMUNICATION & MOUNTS SADDLEBAGS & LUGGAGE SEATS & SISSY BARS FUEL/AIR SYSTEMS EXHAUST TRANSMISSION & DRIVELINE ENGINE GASKETS & SEALS LIGHTING ELECTRICAL HANDLEBARS, CONTROLS & MIRRORS CABLES TANKS & OIL FILTERS BRAKES DASHES & GAUGES FENDERS & LICENSE PLATE FRAMES HARDWARE, COVERS & GENERAL FRAMES & SUSPENSION FOOTRESTS & FLOORBOARDS WHEELS & AXLES All part numbers in BLUE are new for the OldBook. SECTION 7 270 See FATBOOK For Late Model Applications DISCLAIMER: *EMIS (EMISSIONS CATEGORIZATION CODE). SEE PAGES 5-7 FOR CATEGORY CODES, IMPORTANT EPA/CARB EMISSION DEFINITIONS AND REGULATORY COMPLIANCE AND NOTICE REGARDING NOISE REGULATIONS. PRODUCTS NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES IF NOT CATEGORIZED AS “1” OR “4”. HIGH-PERFORMANCE PISTONS •Forged from a high-silicon aluminum alloy to deliver long life and consistent dimensions •Wiseco’s high-tech manufacturing ensures greater operating strength and lower expansion at high temperatures •Sold in kits that include two pistons, rings, piston pins and circlips •Include forged pistons with coated skirts, rings, retainer clips and chrome piston pins •Piston kits are available with Hastings-style X-Ring package (0.062 top ring, 0.062 compression ring and 0.158 oil ring) NOTE: Replacement rings include rings for one piston only. PISTON KITS •Replacement pistons available for stock and big-bore applications •All piston kits come with two pistons, rings, wrist pins, and wrist pin keepers •Compression ratios listed are approximate and are calculated using the correct-length cylinders as specified by S&S DESCRIPTION PISTON KIT REPL. RINGS REPL. CIRCLIP (PR.) FOR 84-99 EVOLUTION BIG TWIN (1340CC) X-RING PACKAGE (10:1 COMP.) Std. K1665 3497X W5731 0.005” K1675 - W5731 0.010” K1666 3507X W5731 0.020” K1667 3517X W5731 0.030” K1668 - W5731 FOR 84-99 EVOLUTION BIG TWIN (1340CC) X-RING PACKAGE (8.5:1 COMP.) 0.010” K1641 3507X W5731 DESCRIPTION PISTON KIT REPL. RINGS REPL. CIRCLIP (PR.) FOR 84-99 EVOLUTION BIG TWIN (1340CC) X-RING PACKAGE (8.5:1 COMP.) (CONT) 0.020” K1642 3517X W5731 0.030” - - W5731 FOR 78-84 BIG TWIN 1340CC 80” (9.5:1 COMP.) X-RING PACKAGE 0.030” - - W5731 FOR 72-85 XL 1000CC For all Wiseco pistons - - CW20 FOR 41-84 BIG TWIN PART # SIZE S&S # FORGED “HIGH COMPRESSION” PISTONS, FOR 74” STOCK MOTORS WITH 3.4375” BORE AND 3.9687” STROKE (9:1 C.R.); WRIST PIN DECK HEIGHT 1.436” 0910-1927 Std. 106-5503 0910-1930 0.030 106-5506 FORGED “HIGH COMPRESSION” PISTONS, FOR 80” STOCK MOTORS WITH 3.500” BORE AND 4.250” STROKE (9:1 C.R.); WRIST PIN DECK HEIGHT 1.270” 0910-1935 0.030 106-5522 FORGED PISTONS 3.625” BORE, 88” (7.5:1 C.R.), 93” (8.5:1 C.R.), 93” HC (9.1:1 C.R.), 98” (8.9:1 C.R.), MOTORS AND SIDEWINDER KITS; WRIST PIN DECK HEIGHT 1.260” 0910-1992 Std. 106-5535 0910-1993 0.010 106-5536 0910-1994 0.020 106-5537 PART # SIZE S&S # FORGED PISTONS 3 7/16” BORE, 84” (8.4:1 C.R.), 86” (9.4:1 C.R.), 88” (10.8:1 C.R.) (USE WITH S&S STROKER FLYWHEELS) 0910-4521 0.050 106-5778 0910-4523 0.080 106-5781 FORGED PISTONS 3 7/16” BORE, 84” (7.3:1 C.R.), 86” (8:1 C.R.), 88” (9:1 C.R.) (LOW COMPRESSION, USE WITH S&S STROKER FLYWHEELS) 0910-5263 0.090 920-0091 •Require the use of connecting rods with a rod length of 7.440” (standard length OEM #24281-74A connecting rods); use of earlier connecting rods with a rod length of 7.470” (OEM #24281-41A) will result in a slight increase in the compression ratio of about one-halfpoint, and may also result in clearance problems (check all piston to cylinder head clearances carefully when using the early-style rods) •Made in the U.S.A. 0910-1992 0910-1927 K1675
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