BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | SNOW ENGINE ENGINE 538 HIGH-PERFORMANCE SNOWMOBILE PISTONS (CONT) FITS MODEL NO. OF CYL. BORE X STROKE (MM) DISPL. (CC) SIZE (MM) PISTON/ GASKET KIT PART # PISTON PART # REPL. RING SET PART # REPL. WRIST PIN REPL. CIRCLIPS TOP END BEARING YAMAHA (CONT) Mountain Max 600 00-02, SX 600R 00-02,Vmax 3 65 593 STD 0903-0613 0910-0570 - S-423 CW20 - 600 99-02, SX Venom 04-06,Venture 600 99-06 x Nikasil bore. Pro-Lite, Electra Coated. 59.6 SX 700R 00-01,Vmax 700 97-02,Venture 700 3 70.5 698 STD SK1251 2385M07050 2776CD S-423 CW20 0924-0124 98-03, Mountain Max 700 98-04 x Nikasil bore. Pro-Lite, includes wrist pin. 59.6 Liquid cooled. SRX 700 98-02, Mountain 700 98 3 69 696 STD SK1270 2397M06900 2717CD S-423 CW20 0924-0124 Nikasil bore. Pro-Lite, Electra Coated. x 778 4.00 0903-1242 0910-4041 - Liquid cooled. 62 SX Viper 02-04, SX Viper Mountain 03-06, 3 69 696 STD SK1325 2397M06900 2717CD S-423 CW20 0924-0124 Venture 700 04 x Liquid cooled 62 Nikasil bore. Pro-Lite, Electra Coated. Nytro 06, RS Rage 05-07, RS Vector 05-09, 3 79 1049 3.00 - 0910-4060 - - - - RS Vector Mountain 05-07, RS Venture 05-08, x VK Professional 05-09 66.2 Skirt-coated. *12.5:1 compression. Apex 06-10, GT 08-10, LTX 08-10, 4 74 998 STD - 0910-4057 - - - - MTX 08-10,Attack 06-07, x RX Warrior 04-05, RX-1/Mountain 03-05 58 RX-1 Mountain 03-07 Nikasil bore * 13:1 Compression Nytro FX/RT2, Nytro XTX 08-14, 3 82 1049 STD - 0910-4060 - - - - Nytro RTX 08-14, Nytro MTX 06-12, x Nytro MTX SE 08-14, SR Viper 14-15, 66.2 RS Vector/LX/GT 10-15, RS Venture GT 09-15 Skirt coated. Kit includes head gasket only. *12.5:1 Compression 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. REPLACEMENT WRIST PIN DIMENSIONS PART # OD/LENGTH S-255 16 mm/1.9685” S-257 18 mm/2.2047” S-270 16 mm/1.850” S-278 18 mm/2.4724” S-423 20 mm/2.185” S-459 18 mm/1.850” PART # OD/LENGTH S-461 20 mm/2.559” S-477 18 mm/2.0748” S-486 24 mm/2.1752” S-512X 20 mm/2.362” S-513 18 mm/2.3031” WRIST PINS • Wiseco wrist pins are strong, lightweight and can also be used with OEM pistons too CIRCLIPS • Two high-strength, easy-to-install circlips furnished with every piston •Order additional inventory from the chart below REPLACEMENT CIRCLIPS DIMENSIONS PART # SIZE CW16 16 mm CW18 18 mm CW20 20 mm PART # SIZE (MM) B1016 16 x 20 x 19.5 B1021 16 x 20 x 22.5 B1008 16 x 21 x 19.5 B1003 18 x 22 x 22 B1014 18 x 23 x 22 PART # SIZE (MM) 0924-0124 20 x 25 x 21.8 B1023 20 x 25 x 25 B1024 20 x 26 x 24 B1031 20 x 25 x 23 TOP-END BEARINGS •Wiseco top-end bearings, OEM quality or better
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