Wiseco Performance Oversized Piston KitPart Number: 2379M07900 These kits contain everything you need to complete your piston repair, the first time High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power. Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy. All Piston Kits are precision crafted and forged in the USA Wiseco's Piston Kits are offered for nearly every popular application in the powersports market. These kits contain everything you need to complete your piston repair, the first time. High quality parts specifically chosen by us to match our forged pistons are included in this kit for easy one stop shopping. 2-stroke kits feature our Pro-Lite pistons that are CNC machined for optimal cam shape and profile for peak HP and service life. 4-stroke kits feature a race-ready dome finish with smooth edges for improved combustion flow. Horizontal slot-pin oiling reduces friction and provides scuff resistance, along with a pressure seal groove for maximum ring seal. 4-stroke race applications feature Wiseco's Armor Glide skirt coating to provide reduced friction and noise to contribute to increased horsepower. Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Supercross, Motocross, GNCC, Super-bike, and more. Fits:1993-99 Ski-Doo 670 Engine Type1999 Ski-Doo Formula Deluxe 670 1998-99 Ski-Doo Formula Z 670 1997-98 Ski-Doo MXZ 670 1995-97 Ski-Doo Summit 6701996 Ski-Doo Mach I 670 1993-95 Ski-Doo Formula Mach I 670 1994-95 Ski-Doo Formula SS 6701994-95 Ski-Doo Grand Touring 670 SE Specs: Displacement: 686cc Bore-Standard: 78.00mm Bore-Actual: 79.00mm Bore-Oversize: 1.00mm Stroke: 70.00mm Product Details Tire Diameter Speed Rating Load Rating Wall Construction Tire Tube Type Rim Size Product Line Wiseco Piston Kit Part Number 2379M07900 Fitment Type Unit Sale Qty Each Style Material Color Size 79.00mm Finish Position Functional Length Cable Sleeve Length Cable Sleeve Travel Driver Seat Length Passenger Seat Length Driver Seat Width Passenger Seat Width Piston/Cylinder Size 79.00mm Piston Size Added Cylinder Stroke Volume Final Engine Displacement Exhaust Configuration Muffler Size Muffler End/Tip Style Windshield Height Windshield Width Handlebar Diameter Ca ARB Compliance Non CARB Complaint CARB Compliant Product Disclaimer Items Included Fitments