BOLD MAGENTA part numbers are new for 2024 PARTS-UNLIMITED.COM 2024 | OFFROAD PISTON & PISTON KITS 1324 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 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 •See price list on pages 1351-1352 WISECO PISTON PRICING •All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on pages 1350-1351 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 Formula for computing cubic centimeter displacement D = Bore Size in Inches; S = Stroke in Inches; Number = Number of Cylinders D(2) x .7854 x S x N x 16.387 = CC Displacement 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 - 0910-2872 2658CD CW18 S-477 - x 69.8 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 45.0 STD 0903-1127 0910-2880 - CW12 - B1042 *Nikasil Bore - Cylinder sleeving x 47.0 2.0 - 0910-2881 1850CS or replating required for oversizes 40.8 Pro-Lite MC 85 21-23 47 85 47.00 - - 0903-0586 1850CS CW14 S-517 B1012 ArmorGlide skirt coated x 48.95 EC 125 00-11, MC125 00-11 54 125 54.0 STD - 0910-0729 2126CS CW15 - - Racer’s Choice GP Style x 134 56.0 2.0 - 0910-0730 2205CS Electra Coated 54.5 *Nikasil Bore – Cylinder sleeving or replating required for oversizes MC 125 21-24 54 124 54.0 STD - 786M05400 2126CS CW15 S-467 B1013 Pro-Lite x 56.0 2.00 - 786M05600 2205CS *Nikasil Bore - Cylinder sleeving or 54 replating required for oversizes MC 125 21-24 54 124 54.0 STD - 0910-2882 2126CD CW15 - B1013 GP Series Racer’s Choice; 2-Ring Version x Electra coated 54 ArmorGlide skirt coated 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 •See price list on page 1352 TOP-END BEARINGS •High-quality bearings are manufactured to the highest standards; case-hardened for maximum life and smooth operation at high engine speeds •See price list on page 1352 CIRCLIPS • Two high-strength, easy-to-install circlips furnished with every piston •Order additional inventory from the chart on pages 1324-1349 •See price list on page 1352 REPLACEMENT RING SETS •Each ring set is for one piston •See Wiseco ring buyer’s guide for details •See price list on page 1352 NOTE: Wiseco rings fit only Wiseco pistons.
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