Vertex VTK22650B 1 Top End Piston Kit for 2004 KTM 250 EXC 66.35mm 2003 Yamaha YFM660F GY Grizzly Limited Edition 2008 Arctic Cat 366 Auto IRS 2008 Arctic Cat 366 Auto IRS Product Details Tire Diameter Speed Rating Load Rating Wall Construction Tire Tube Type Rim Size Product Line Winderosa Top End Gasket Set Part Number 810573 Fitment Type Unit Sale Qty Set Style Material Color Size 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 Piston Size Added Cylinder Stroke Volume Final Engine Displacement Exhaust Configuration Muffler Size Muffler End Tip Style Windshield Height Windshield Width Handlebar Diameter California Air Resource Board Compliance FALSE Product Disclaimer Product Details Tire Diameter Speed Rating Load Rating Wall Construction Tire Tube Type Rim Size Product Line Vertex Top End Rebuild Kit Part Number VTK22650B 1 Fitment Type Unit Sale Qty Each Style Material Color Size 66 which aids in break in and adds to lubrication