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    Help identifying my steering cylinder

    I have a 1990 Blackfin Combi with 1998 Yamaha outboards. I'd like to add an autopilot and need to know the c.i. the steering cylinder pushes. The original steering system is by Hynautics and I believe the cylinder is original but because the motors have been changed the cylinder may have also...
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    Color of gear oil from lower unit

    I have twin 1998 Yamaha 250hp ox66 EFI motors. Today I drained the gear oil from both lower units and 2 completely different color oils came out. The starboard was yellow - green and slightly creamy similiar to the new Yamaha gear oil. The port (counter rotating ?) was black. The main bearing...
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    Proper flushing question

    I was misinformed about the proper way to flush my 1998 Yamaha 250 hp EFI motor. When I pulled my boat for the season I used the built-in hose connection and ran at idle for about 5 minutes. The water pump has about 150 hours on it. Can I assume I've done damage to the impeller or other parts?
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    Help with winterizing

    I am attempting to winterize my 1998 Yamaha 250 hp OX66 EFI for the first time. I'm familiar with the procedure but I'm not sure about spraying the fogging fluid. If I remove the silencer from the motor, will that expose the injectors and will the motor continue to run? Thanks for the help.
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    Yamaha OX66 EFI vibrates and rattles

    I have a 1998 250 hp Yamaha OX66 EFI motor with about 800 hours. I've been hearing a slight noise that I haven't been able to pinpoint until today when it got much louder and started vibrating. According to my mechanic something let loose with the driveshaft or damper that will require him to...
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    Twin Yamaha 250 ox66 motors burn differently

    I have twin 1998 250hp ox66 fuel injected motors with approximately 750 hrs. One motor had a new power head installed at approximately 600 hrs. The original motor burns about 10% more fuel and oil than the motor with the new power head. Is this normal?
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    YAMAHA FUEL GAUGE DOESN'T READ ACCURATELY

    I have twin 1998 250hp OX66 fuel injected motors with Yamaha gauges. My gauges do not read fuel consumption below 10 kts., so while trolling my burn is inaccurate. Is there an adjustment on the fuel gauge other than the 1-3% adjustment, or should I be looking at the relay, lines, or something else?
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    Tilt motor won't go up

    I have a 1998 250 hp ox66 fuel injected motor. I removed the tilt motor wires to install a new trim sensor, and when I reconnected everything, the tilt motor was not going up. It works in the down position perfectly. I'm sure I connected everything correctly. Any suggestions?
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    Purpose of a blower on an outboard

    I have a Blackfin Combi with outboard motors. The location of my bilge blower is doing little to vent anything. Since I have 3 seperate fuel tanks, can anyone recommend where to locate the blower nad if it's necessary?
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    Purpose of a blower on an outboard

    I have a Blackfin Combi with outboard motors. The location of my bilge blower is doing little to vent anything. Since I have 3 seperate fuel tanks, can anyone recommend where to locate the blower nad if it's necessary?
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    Still have alarm sounding with 704 controls

    I followed the advise of Rodbolt (thanks Roadbolt) and adjusted the tps on the controller for the actuator and adjusted the cables. This was to correct an alarm ringing on the starboard engine when I shifted into forward from either station. Now instead of the alarm ringing when I shift to...
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    704 controls and actuator problem

    I have twin 1998 Yamaha 250 hp ox66 outboards that are controlled by 2 stations. When I put the starboard engine in "forward" from either station, an alarm sounds. This happens when the engines are running or not. When I disconnect the Pink wire from the wire harness at the actuator, the alarm...
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    250 hp OX66 electrical rigging question

    I have twin 1998 motors which were a repower installation with new gauges and controls to 2 stations. I recently discovered corroded wires on some bullet and plug connections which I believe is the cause for some erratic alarm problems. Do any of the plug connections have any internal wiring...
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    Yamaha 250 mid range rpm's change

    I have twin 1998 250 ox66 fuel injected motors. They idle perfect at 700 and will stay steady to under 2000. Above 3700 to 5200 they run perfectly. It's the between range, 2000 to 3700 where the rpm's will bounce as much as 500, sometimes only one or both motors, primarily in the 3000 to 3700...
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    Yamaha engine alarm buzzing

    I recently purchased and transported a boat with twin 1998 250hp ox66 outboards from Fla. to NJ. It was necessary to remove the tower and disconnect the steering, controls, and gauges. Since I reconnected everything, both tachometer gauges have an arrow pointing to the low oil indicator even...
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