BOLD MAGENTA part numbers are new for 2026 ENGINE PARTS-UNLIMITED.COM STREET | 2026 ENGINE 1383 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 DISPLACEMENT BORE X STROKE COMPRESSION RATIO PART # HONDA CB750F/K SOHC (2-valve) 69-78 836cc 65.00 mm x 63 mm (+3 mm) 10.25:1 K836 KAWASAKI 500S/H-1/KH/Mach III Std. 60.50 mm x 59.7 mm (Std.) - 0903-0421 ZX600 Ninja ZX-6R 09-12 599cc 67.0 mm x 42.5 mm (Std.) 13.8:1 0910-57312 750 Mach IV/H2 Race Model 769cc 72.0 mm x 63 mm (+1 mm) - 0903-0424 ZN/KZ/GPz 750 80-85 810cc 69.00 mm x 54.14 mm (+3 mm) 10.25:1 0903-0158 KZ900 76-77 1015cc 70.00 mm x 65.93 mm (+4 mm) 10.25:1 K1015 Z1/Z1A/Z1B 76-77 1045cc 71.00 mm x 65.93 mm (+5 mm) 10.25:1 K1045 KZ1000/Z1-R 77-80 1075cc 72.00 mm x 65.93 mm (+6 mm) 10.25:1 K1075-11 KZ1000J, KZ1000R 81-83 (17 mm pin) 1075cc 72.00 mm x 66 mm (+2.5 mm) 10.25:1 0903-0161 YAMAHA RD350 73-75, RD400 76-79 353cc 64.50 mm x 54 mm (+.5 mm) - 0903-04232 YZF-R6 01-05 600cc 65.50 mm x 44.5 mm (Std.) 13.5:1 0903-0168 YZF-R6 06-18 599cc 67.00 mm x 42.50 mm (Std.) 13.4.1 0910-57332 1 Resleeving required. 2 Head gasket not included. FORGED PISTON KITS • Complete engine kits include pistons, ring sets, piston pins, retainer clips and head gasket •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 •Made in the U.S.A. K1045
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