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    250 heads?

    I have a 91 250 with a bad cylinder and picked up a 93 powerhead to put on. The heads on my 91 were newer and I would like to use them. The 91 has the thermo switches in the heads and the 93 has the thermo switches in the t-stat covers. Which ones should I use? How do I block off the unused...
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    Towing in Florida?

    Do I need any permits to tow a 31' long 10' beam boat in FL? Thanks
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    250 Leaking Lower Crank Seal, Symptoms?

    How can I tell if the lower crankshaft seal is leaking on my 91 250? I got water in the #6 cylinder and can't figure out where it came from.
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    How Water Got In #6 Cylinder? 250HP?

    My 91 250 got some water in the #6 and got stuck from sitting. I pulled the head off and got her spinning again but need to find the source. The heads were changed in the past and it and the gasket both looked good. I took the exhaust cover off and things look good there also. There is almost...
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    250 Seized from sitting

    My 930 250 is stuck from siing. It was running fine 2 months ago. I took the plugs out and put 2 stroke oil in the cylinders. What size nut is on the flywheel so I can try a socket and breaker bar?
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    What Size Cables For Yam 250?

    For some reason the main cables for my 91 250 Yamahas were put inside the engine bracket. There are lugs there where 2 or 3 cable meet up. The large positives are corroded and I wan't to put new crimp ends on. These are the factory ones that come from the engine. If anyone knows what size these...
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    What Size Bolt Holds Trim Tab, 91 Yam 250

    I have to get in the water to change the zinc trim tabs. Anyone know what size bolt it is so I bring the right sized socket? Thanks
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    91' 250 Oil Pump Sticky?

    I decided to sync the carbs on my port motor. Now the oil pump keeps the throttle open a bit on the 3 port carbs. With the rod off of the engine it goes back to idle fine. When I move the rod with my hand the pump feels like it hangs up occasionally. Anyone seen this before? I have done some...
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    Winky Blinky?

    key on or engine running?
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    Yamaha Theremosensor Test?

    Delete
  11. S

    Yam 250 Won't Shut Off..?

    I took the boat for a short ride today and the starboard tac was acting eratic and blanking out. When I shut the starboard motor off (been having other problems with it also) the motor just kept running. I finally shut the fuel off to kill it. I'm thinking maybe a bad ground. Any pointers on...
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    Yam Low Pressure Fuel Pumps

    Has anyone gotten a defective one out of the box? I changed all 3 and still have the same problem. Just wondering.
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    Choke or Cold Start 91 250?

    What is used to start a cold 91 250? I think it is stuck in cold mode on the starboard engine. Thanks
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    Yamaha Speed/ Fuel Management Combo Gauge?

    Does anyone know what the black and gold plug is for on the back of the combo guage?
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    Speed/FMG Combo Guage to GPS?

    I have the speed/FMG combo guage and would like it to run from the Garmin. There is a black wire and plug on the guage already with a strange looking plug on it. Will this work or do I need the signal lead 6Y5-87122-S0-00 from the diagram? Thanks
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    Adding Yamaha Fuel Managemant to Old Motors?

    Can I add the system to my 1991 twin Yam 250's? What would I need? Thanks
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    I Need a Yam TnT Switch

    The tilt and trim switch that mounts on the cowling of my 91 250 corroded away. I'll call Yamaha today for a price but I'm sure the new ones are expensive. Thanks
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    Fuel and Oil Dripping from Prop

    I have twin 91 250 Yammies which both run fine. The starboard motor at WOT is 200 rpm less that the port (could be a cable adjustment). When I put the boat on the lift there is fuel dripping from the prop hub. Any ideas what would cause this? nIt seems to run too smooth to be misfiring.
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    How To Test A Yamaha Hot Horn???

    I have twin 91 Yam 250's and when I turn the keys the starboard motor will beep but the port motor makes no sound. I swapped the buzzers around in the keys switch so I know thats not it. Any ideas on how to test the wiring or sensors?
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    Blinky Winky Yamaha Test Light ?

    I need one and they are on national backorder. :confused: Does anyone have one to sell or rent?<br /><br />Thanks
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