BOLD MAGENTA part numbers are new for 2025 ENGINE PARTS-UNLIMITED.COM STREET | 2025 ENGINE 1391 DISCLAIMER: *EMIS (EMISSIONS CATEGORIZATION CODE). SEE PAGES 4-6 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”. FITS MODEL OVERSIZE PISTON PART # REPL. RINGS REPL. WRIST PIN (EA.) REPL. CIRCLIP (PR.) HONDA XR/XL500 79-82, FT500 82-84 (10.5:1 comp.) Std. 4117M08900 3504XC - CW21 0.5 mm 4117M08950 - - CW21 1.0 mm 4117M09000 3544XC - CW21 XR/XL500 79-82, FT500 82-84 (12:1 comp.) 0.5 mm 4163M08950 - - CW21 XL600 83-87 RFVC (11:1 comp.) 1.0 mm 4332M10100 3977XH - CW24 CBR1000F - - - - CW20 KAWASAKI KLX400 03-04 - - - - CW20 500S/H-1/KH, Mach III 1.0 mm 149M06100 - S-256 CW16 KLX650C 93-95, KLX650R 96-01 Std. 0910-3949 - - - 750 Mach IV/ H2 Race Model 0.5 mm 423M07150 2815CD - CW16 1.0 mm 423M07200 2835CD - CW16 1.5 mm - 2854CD - CW16 2.0 mm 0910-3954 2874CD - - FITS MODEL OVERSIZE PISTON PART # REPL. RINGS REPL. WRIST PIN (EA.) REPL. CIRCLIP (PR.) SUZUKI DR350S 90-99, DR-Z400S/SM 00-16 - - - - CW20 DR650 96-11 (10.5:1 CR flat top) Std. 0910-5734 - - CW23 SV650 99-06, SV650S 01-06 - - - - CW20 GSX-R1100 86-98, GS1150E 84-86 - - - - CW20 YAMAHA YSR50 Big Bore kit (57cc) 3.0 mm 598M04300 - - - RD350 73-75, RD400 76-79 Std. - 2520CD S-486 CW16 0.5 mm 393M06450 2539CD S-486 CW16 1.0 mm 393M06500 2559CD S-486 CW16 1.5 mm - 2579CD S-486 CW16 2.0 mm 393M06600 2598CD S-486 CW16 RZ350 82-90 2.5 mm 0910-3956 2520CD S-486 CW16 XT600 84-89, SRX600 86 Std. - 3740XH - - HIGH-PERFORMANCE 2- AND 4-CYCLE MOTORCYCLE PISTONS •All Wiseco pistons are forged from aerospace aluminum alloys on Wiseco’s state-of-the-art forging presses •Built on a legacy of championships for over 60 years by American craftsmen •Wiseco pistons have the latest dyno-tested technology to out-perform the competition •Wiseco forged pistons are priced with rings and circlips • Wiseco rings, clips and wrist pins only fit Wiseco pistons; also note that ring types do not interchange (i.e. CD is not interchangeable with TD) WARNING: Wiseco pistons can be fitted only with Wiseco rings. PART # SIZE CW16 16 mm CW20 20 mm CW21 21 mm PART # SIZE CW23 23 mm CW24 24 mm CIRCLIPS • Two high-strength, easy-to-install circlips furnished with every piston •Order additional inventory from the chart below PART # FITS BORE SIZE 2520CD 64 mm 2539CD 64.5 mm 2559CD 65 mm 2579CD 65.5 mm 2598CD 66 mm 2815CD 71.5 mm 2835CD 72 mm PART # FITS BORE SIZE 2854CD 72.5 mm 2874CD 73 mm 3504XC 89 mm 3544XC 90 mm 3740XH 95 mm 3977XH 101 mm REPLACEMENT RING SETS •Each ring set is for one piston •See Wiseco ring buyer’s guide for details NOTE: Wiseco rings fit only Wiseco pistons. ID X OD X LENGTH (MM) PART # 15 x 19 x 17 B1001 20 x 25 x 27.8 B1004 ID X OD X LENGTH (MM) PART # 14 x 18 x 16 B1012 14 x 18 x 20 B1018 TOP-END BEARINGS •Wiseco top-end bearings, OEM quality or better OD/LENGTH PART # 16 mm/2.050” S-256 OD/LENGTH PART # 16 mm/2.175” S-486 WRIST PINS • Wiseco wrist pins are strong, lightweight and can be used with OEM pistons CW20 3544XC 0910-3949
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