Namura Top End Rebuild Kit for 1990 94 Polaris Trail Boss 350L 79.95mm NA 50001K 2006 Yamaha YFM350 Bruin 350 4x4 4WD 4WD Hunter 73mm Age Group Gender Position 73mm Age Group Gender Position Tire Diameter Speed Rating Load Rating Wall Construction Tire Tube Type Rim Size Material Color Finish Functional Length Cable Sleeve Length Cable Sleeve Travel Driver Seat Length Passenger Seat Length Driver Seat Width Passenger Seat Width Overall Seat Width Overall Seat Length Piston Cylinder Size 86 All Balls Racing Tie Rod Upgrade Kit Why replace your cylinder when you can replace the piston for a fraction of the cost and time Quality materials mean increased longevity and continued performance