Pivot Works PWSAK Y03 001 Swing Arm Kit for 1987 Yamaha YZ125 2003 Moto Guzzi California Stone Part Number: PWSAK K12 001 Part Number: PWSAK K12 001 2 stroke pistons have an 18% silicon content which decreases wear and thermal expansion Product Details Tire Diameter Speed Rating Load Rating Wall Construction Tire Tube Type Rim Size Product Line Pivot Works Swing Arm Bearing Kit Part Number PWSAK Y03 001 Fitment Type Unit Sale Qty Kit Style Material Color Size Finish Position Rear 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 An ill performing swing arm can lead to a loss of action and handling in your rear suspension