Yamaha & Mariner  Long Shaft Extension Kits  Bay has expanded its line of kits to convert  many Mariner and Yamaha outboards to long or extra long shaft.  Even though they cost a fraction of factory parts alone to convert standard motors to long shaft,  Bay extension kits are designed and manufactured of top quality materials to give lasting reliability to your outboard motor. Using compatible alloys in both the housings, shafts, and studs, these kits are as corrosion resistant as the motor itself. All shaft and studs are of stainless steel and housings are cast of the same type of alloy as used in the motors. Dealer pricing is available pending proper qualifications. New 4 Stroke Models Available. Description Bay Kit # Length Type Yamaha T8 & T9.9 4 stroke #811A 5 inches Yamaha T9.9 #811 5 inches Yamaha 9.9 & 15hp 2 stroke #804 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 9.9 & 15hp 4 stroke #811 5 inches Please furnish Year, HP, model, and serial number to us. Mariner 15 hp 2 stroke #804 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 25 hp 2 stroke #813 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 25 hp 4 stroke #812 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha T25hp #806 5 inches Yamaha 20hp 2 stroke #811 5 inches Please furnish Year, HP, model, and serial number to us. Mariner 30/40 hp #806 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 40hp 3 cyl. #807 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 25,30,40 hp #807A 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 40 & 50 #806 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 50hp 3 cyl. #807 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 50 & 60 4 Stroke #808 5 inches Please furnish Year, HP, model, and serial number to us. Yamaha 70,75,80,85, 90 HP 2 stroke #809 5 inches Please furnish Year, HP, model, and serial number to us. 70,75, 80,85, & 90 4 stroke #809S 5 inches Drive shaft not available 2010 70hp 4 stroke #808 5 inches complete kit 115 & 100 hp 2 stroke #801 5 inches F115 4 stroke + F100 #810S 5 inches Drive shaft not available for some models Yamaha 130,150,175 #801 5 inches V4 and V6 models F150 4 stroke #801 5 inches Yamaha 200 2 Stroke and 4 stroke models #801 or #805 5 inches 200hp models can fit 801 or 805 furnish year, hp, model Yamaha 225 - 250 #805 5 inches Yamaha 300hp #805 5 inches Yamaha F250 & F300 4.2 liter XCA models #805A 5 inches