BOLD MAGENTA part numbers are new for 2026 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2026 PISTON & PISTON KITS 1397 WRIST PINS • Wiseco wrist pins are strong, lightweight and can be used with OEM pistons, too •Wiseco 2-stroke pistons include a wrist pin unless indicated TOP-END BEARINGS •High-quality bearings are manufactured to the highest standards; case-hardened for maximum life and smooth operation at high engine speeds CIRCLIPS • Two high-strength, easy-to-install circlips furnished with every piston •Order additional inventory from the chart on pages 1397-1423 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. HIGH-PERFORMANCE PISTONS •Forged from high-silicon aluminum alloy for maximum strength and dependability •Wiseco offers a complete range of popular piston models and years for both trail and racing applications HIGH-PERFORMANCE PISTONS continued on next page. Formula for computing cubic centimeter displacement D = Bore Size in Inches; S = Stroke in Inches; Number = Number of Cylinders D(2) x 0.7854 x S x N x 16.387 = CC Displacement WISECO FEATURES PRO-LITE PISTONS • Durability, longevity and increased horsepower •Innovative forging design and piston skirt provide maximum horsepower and torque PK PISTON AND GASKET KITS •Contains all the necessary components for overboring or rebuilding your top end • Features forged pistons, rings, wrist pins, circlips and top end gasket set •Cylinder sleeves must be purchased separately WISECO PISTON PRICING •All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips 4-STROKE RACER’S CHOICE PISTONS •Now you can own the same race parts as all the top race teams •These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer •When blow-by starts to increase on other pistons and power starts to fade,Wiseco Race Series parts continue sealing and performing NOTE: Service intervals may be increased with Racer’s Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only. 2-STROKE GP SERIES PISTONS •Have additional features over standard Pro-Lite parts • Each piston is E-coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation •GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression • Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end FITS MODEL BORE (MM) X STROKE (MM) DISPL. (CC) BORE SIZE (MM) OVER SIZES (MM) PK KIT PART # PISTON PART # REPL. RING SET PART # REPL. CIRCLIPS PART # REPL. WRIST PIN PART # TOP-END BEARING PART # ATK/ROTAX 250 96-01 67.5 250 67.5 STD - - 2658CD CW18 S-477 - x 69.8 BETA 200 RR 19-25 62 200 62 STD - 0910-6917 - - - - ArmorGlide skirt coated. x 63 350 RR 17-25 88 350 88 STD - 0910-6923 - - - - 13.2:1 Compression x ArmorGlide skirt coated. 57.4 390 RR 17-25 88 385 88 STD - 0910-6924 - - - - 12.5:1 Compression x ArmorGlide skirt coated. 63.4 430 RR 17-25 95 430 95 STD - 0910-6925 - - - - 13.5:1 Compression x ArmorGlide skirt coated. 60.8 480 RR 15-25 100 480 100 STD - 0910-6926 - - - - 11.9:1 Compression x ArmorGlide skirt coated. 60 GASGAS 2-STROKE MC 50 21-23 39.5 49 39.5 STD - 0910-3963 - CW12 0913-0014 - x 40 MC 65 21-23 45 65 45 STD 0903-1127 0910-2880 - CW12 - B1042 Nikasil Bore - Cylinder sleeving or replating required for oversizes. x 40.8 47 2.0 - 0910-2881 1850CS Pro-Lite.
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