$4,500 This listing is for a Good Used 2004/2006 Yamaha 90 HP 4-Cylinder Carbureted 4-Stroke 20" (L) Outboard Motor. We have built this motor from two different motors. It consists of a 2006 Yamaha 115 HP Midsection/Lower Unit and a 2004 Mercury 90 HP Powerhead. (Yamaha and Mercury used the Exact Same Powerheads during this time frame.) Yamaha Model number: F115TLR. Mercury Serial number: 0T941736. Weight - 380 lbs. 125-130 PSI compression on all four cylinders. New Gear Oil. Has been used in Fr