BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | STREET ENGINE ENGINE 1382 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 - 1.0 mm 4117M09000 3544XC XR/XL500 79-82, FT500 82-84 (12:1 comp.) 0.5 mm 4163M08950 - - CW21 XL600 RFVC 83-87 (11:1 comp.) 1.0 mm 4332M10100 3977XH - CW24 CBR1000F 90-96 - - - - CW20 KAWASAKI KLX400 03-04 - - - - CW20 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 1.5 mm - 2854CD 2.0 mm - 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 1.0 mm 393M06500 2559CD 1.5 mm - 2579CD 2.0 mm 393M06600 2598CD 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) •Made in the U.S.A. WARNING: Wiseco pistons can be fitted only with Wiseco rings. SIZE PART # 16 mm CW16 20 mm CW20 21 mm CW21 SIZE PART # 23 mm CW23 24 mm CW24 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 # 14 x 18 x 16 B1012 14 x 18 x 20 B1018 ID X OD X LENGTH (MM) PART # 15 x 19 x 17 B1001 20 x 25 x 27.8 B1004 TOP-END BEARINGS •Wiseco top-end bearings, OEM quality or better OD/LENGTH PART # 16 mm/2.175” S-486 WRIST PIN • Strong, lightweight and can be used with OEM pistons 0910-3949
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