QUALITY NIKASIL PLATED CYLINDER AND 2 RING PISTON UPGRADE YOUR CS-590 TO A CS-620 STYLE CYLINDER HIGH QUALITY NIKASIL PLATED CYLINDER WITH CHAMFERED PORTS AND 2 RING PISTON HEAVY DUTY REPLICA OF CS-620P CYLINDER. YOU CAN UPGRADE A CS-590 WITH THIS CYLINDER FITS ECHO CS-590 TIMBERWOLF, CS-620P, CS-620PW AND CS-600P. FITS SHINDAIWA 591 AND 600SX REPLACES PART NUMBERS A130002160, P021043991 INTAKE HOLES ARE NOT THREADED, THE OEM DESIGN IS ALSO NOT THREADED. THE INTAKE SCREWS ARE SELF TAPPING
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