BOLD MAGENTA part numbers are new for 2023 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2023 1139 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 GAS GAS 2-STROKE MC 50 21-22 39.5 49 39.5 STD - 0910-3963 - CW12 0913-0014 - x 40 MC 65 21-22 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 21-22 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 21-22 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 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 .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 • See price list on page 1168 WISECO PISTON PRICING • All Wiseco High-Performance Motorcycle Pistons are priced with rings and circlips; see price list on pages 1166-1168 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 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 1169 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 1169 CIRCLIPS • Two high-strength, easy-to-install circlips furnished with every piston • Order additional inventory from the chart on page 1169 • See price list on page 1169 REPLACEMENT RING SETS • Each ring set is for one piston • See Wiseco ring buyer’s guide for details • See price list on page 1169 NOTE: Wiseco rings fit only Wiseco pistons.
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