Wiseco SK1370 Top End Rebuild Kit 72.50mm Bore +0.50mm (.020) for Polaris Indy 500 (1998–2006) – Oversize Pistons, Rings & Gasket Set – Fits 500 Classic, RMK, Touring Fuji 2-Stroke Engine

Restore power, compression, and reliability with the Wiseco SK1370 Top End Rebuild Kit, designed for Polaris Indy 500 and compatible 500cc models with Fuji twin-cylinder 2-stroke engines.This kit features a 72.50mm bore with +0.50mm (.020") oversize pistons, making it ideal for engines requiring cylinder boring. It helps restore lost compression, improve throttle response, and extend engine life.Manufactured with high-performance forged pistons, Wiseco components provide superior strength, durability, and heat resistance compared to standard cast pistons.Each kit includes (2) pistons, ring sets, wrist pins, circlips, and a complete top-end gasket set—providing everything required for a full rebuild (excluding top end bearings). FITMENT (Vehicle Compatibility)Compatible with Polaris 500cc Fuji Twin Cylinder 2-Stroke Engines:RMK Models 1998–1999 Polaris Indy 500 RMKClassic Models 1998–2002 Polaris 500 Classic 1999–2003 Polaris 500 Classic Touring 2004–2006 Polaris 500 ClassicIndy Models 1998–2006 Polaris Indy 500 IMPORTANT NOTESPart Number: SK1370Bore Size: 72.50mm (+0.50mm / .020" oversize)Designed for Fuji motor 500cc twin-cylinder 2-stroke engines onlyWill NOT fit Widetrack modelsTop end bearings are NOT includedCylinder boring is required for proper installationPlease verify model and year compatibility before purchaseProfessional installation recommended

COMPLETE TOP END REBUILD KIT – Includes (2) Wiseco forged pistons, (2) ring sets, wrist pins, circlips, and a full top-end gasket set—everything needed for a complete rebuild (top end bearings not included).

72.50MM BORE +0.50MM / .020" OVERSIZE - Ideal for cylinder overbore applications—restores compression, improves throttle response, and brings worn engines back to life.

FORGED WISECO PISTONS – HIGH STRENGTH PERFORMANCE - Forged aluminum construction offers superior durability, heat resistance, and longer lifespan compared to OEM cast pistons.

FITS POLARIS 500 MODELS (1998–2006) – FUJI ENGINE - Compatible with Polaris Indy 500, 500 Classic, RMK, and Touring models equipped with Fuji twin-cylinder engines.

DESIGNED FOR 2-STROKE TWIN CYLINDER ENGINES - Engineered specifically for Polaris 500cc 2-stroke engines—perfect for rebuilds, repairs, and performance restoration.