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  1. S

    Mid Range Hesitation - Yamaha 9.9

    I have cleaned the carb twice. Motor starts great and runs smooth, but as you move the throttle from slow to fast, it starts off nice but then bogs down or hesitates at mid speed. Push it a bit more, and it takes off quickly. Is this a carb jet issue, or richness adjustment? And how do you...
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    Yamaha 99 Stops Running

    "One of my 9.9 Yamaha, high th "One of my 9.9 Yamaha, high thrust, 4-stroke motors, has an intermittent issue with stopping. This weekend, ran fine for about two hours, and then kicked a couple of times and died. Pumped up the bulb, and started immediately. Ran for 20 minutes longer, then...
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    Gasoline Ethanol vs Rubber Hose Question

    "I have twin Yamaha 9.9 high t "I have twin Yamaha 9.9 high thrust, 4-stroke motors, vintage 2003. Am running Marine (Ethanol)Stabil and Seafoam as gas additive. Both engines have aluminum tanks, copper tubing to large fuel-water separator combo filters, then black rubber gasoline service...
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    Yamaha 8 hp 2 vs 4 Stroke Choice

    "I am shopping for a motor for "I am shopping for a motor for an Avon 310 (10 ft) RIB. I want something that I can load on and off the dinghy from my cruising cat, that is not going to kill my back. The cost effective choice seems to be a 6 hp 4 stroke Tohatsu/Nissan/Mercury at 55 lbs, or an...
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    Yamaha 99 Water Pump Parts Question

    "Ok, third post, and no respon "Ok, third post, and no response on the other two. Please help! I have a Yamaha FT9.9DE, year 2002. Now before you run away saying that is not a valid model, yep, it is for an Aussie motor. I managed to get a Yamaha parts catalog for the motor, and it calls...
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    Canbt Find Carb for FT99DE

    "Ok, second post, and hoping f "Ok, second post, and hoping for a response on this one. I have a boat made in Australia, with Yamaha high thrust 9.9's. Year 2002 engines. The plate on the side says FT9.9DE. I need to replace the carburetor on one of the engines, as electrolysis has made a...
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    Yamaha 99 Overheating

    "I have a catamaran sailboat w "I have a catamaran sailboat with two 2002 Yamaha 9.9 hp High Thrust engines (FT9.9D). I had problems with both of them over the weekend, and disassembled and cleaned the carbs, and both seemed to work fine. We were motoring home this morning, and the starboard...
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