Amazon Secure Payment System Continue shopping “Idle Adjustment Knob & Retaining Ring – 9.9 & 15 hp – 1974 to 1985 – Johnson Evinrude – OMC 387272” has been added to your cart. Product Price Quantity Subtotal × O'Brien Child Neoprene Life Vest, Blue/Green, 30-50-Pound $44.99 O'Brien Child Neoprene Life Vest, Blue/Green, 30-50-Pound quantity $44.99 × Attwood Corporation SP-400-RB 23"-35" Composite Head Transom Saver with roller and Bolt Bracket $29.83 Attwood Corporation SP-400-RB 23"-35" Composite Head Transom Saver with roller and Bolt Bracket quantity $29.83 × Idle Adjustment Knob & Retaining Ring - 9.9 & 15 hp - 1974 to 1985 - Johnson Evinrude - OMC 387272 $25.82 Idle Adjustment Knob & Retaining Ring - 9.9 & 15 hp - 1974 to 1985 - Johnson Evinrude - OMC 387272 quantity $25.82 Coupon: Apply coupon Update cart Cart totals Subtotal $100.64 Total $100.64 Proceed to checkout