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    2000 Yamaha F100 four stroke oil alarm goes off at first and then goes away

    I changed to 10w30 as spec. Things got much better. Alarm went off only twice yesterday of 7 hours. I was trolling 80% of the time @600RPM. The spec RPM is around 850 as I remember, but I tuned it to 600-700 since it is carb 4 troke engine. Maybe that is another reason why it can have low...
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    2000 Yamaha F100 four stroke oil alarm goes off at first and then goes away

    It IS wrong oil. It specs as 10W-30. I am using 5W-30 sythetic in Texas. Could that be a problem? As for the oil pressure gauge, I do have the gauge ready but the position is so tight under the hood and hard to get those arranged out with the standard adaptors available. Maybe I need to remove...
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    2000 Yamaha F100 four stroke oil alarm goes off at first and then goes away

    Didn't have time on water until last night. Since last time, I have replaced the oil filter from an FRAM to an OEM filter. Your words reminds me and I did check internet and noticed FRAM oil filter cause a lot trouble on outboard. However, every things start good until I am trolling for a long...
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    2000 Yamaha F100 four stroke oil alarm goes off at first and then goes away

    I know it was too good to be true to solve the problem on first try . Last Sunday when I headed out, the alarm went off again when I first started the engine. After half a minute, the alarm was gone. After idling and trolling for half hour, especially when I tilted up the engine to reduce my...
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    Props for Yamaha F100 and 17 Boston Whaler

    Thanks everyone. I agree with everyone and I am very happy with what she does right now. Everything is perfect. The only concern why I am asking this question is what I read from discussions about making oils. It is said yamaha better run at its up limit which is 6000 rpm on WOT to prevent...
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    Props for Yamaha F100 and 17 Boston Whaler

    Engine is 2000 yamaha F100. Boat is 17 boston whaler montauk classic. Current prop is 17 P aluminum. Engine is installed 2 holes up, full RPM is 5600-5700. The manual says it should reach 5600-6000. Top speed is 37 mph. My question is, what option is better for me? 1. Lift engine and install...
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    2000 Yamaha F100 four stroke oil alarm goes off at first and then goes away

    Thanks for the replies. Here is the updates: As I was to test the oil pressure with a mechanic gauge, I found the attachment screw was loose causing the on-and-off alarms. Easy fix but cost me days of thinking.
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    2000 Yamaha F100 four stroke oil alarm goes off at first and then goes away

    My engine is 2000 Yamaha F100 which is running very good. The oil alarm goes off immediately upon starting the engine the first time on water. I stopped the engine, removed the filter, and attempted to clear every droplet before reinstalling it. After several cycles of turning the engine on and...
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    yamaha f100 low oil pressure alarm

    The oil pressure alarm problem happened before occasionally on the lake, when it run in high rpm for 3 mins. It did not trigger the alarm if it was running below 3000 rpms. I guess it was the fault oil pressure switch so I ordered the parts. Then I changed the remote control from 703 to 704 and...
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    Yamaha F100 seized

    Yes, it's running in salt water. The motor is now completely dry and the oil in the oil pan is not milky. I opened the head cylinder and found out the valves all stuck. Not by rust, by very sticky oil gunk . All the bearing holes are blocked by these gunk and can not have lubricant oil go...
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    Yamaha F100 seized

    Indeed that's my plan. Get some potential with low cost and rebuild it to be a perfect one. That is one of my hobby now. Racerone, I appreciate your help very much for my mercury top of tower rebuilding. I spent $2000 to rebuild the 40s to top notch and I feel happy about it. This is my...
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    Yamaha F100 seized

    And also here are some picture from bottom of the powerhead. the exhaust is clean, the water passage has some corrosion which is still tolerable to me. I don't know if there could be a hole somewhere in the cylinders. Just FYI for the questions above. thanks.
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    Yamaha F100 seized

    I was going to ask what next steps should I take to look for causes. Here are some updates I did today. I opened the crankcase cover, the crankshaft is full of rust. The crankshaft is stuck because of rust. My questions are: 1. How bad is it? Is it re-useable or shall I look for new...
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    Yamaha F100 seized

    The crank was seized and was believed to be the lower unit drive shaft and oil pump. It was running good in the fishing trip one day. When it was time to travel back, it got seized there. I have lifted the powerhead. I have tried to crank with a wrench but failed to rotate it. The oil pump and...
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    Yamaha 100 hp 2000s flywheel locked up

    I bought the engine. Going to see what happens to the shaft. The drive shaft stuck to something, but not the crankshaft, which is good. I found this out because when I tried to drop the lower unit, it dropped 1 inch and stuck somewhere. I need to remove the powerhead. Does anyone has PDF...
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    Yamaha 100 hp 2000s flywheel locked up

    Thanks. That's pretty much what I assumed. I am not familiar with Yam. Can't I pull the powerhead and replace the crankshaft? But with a double thinking, the motor got seized and that means either the power head or lower unit got blown, or both in this weld case. I also learned that the oil...
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    Yamaha 100 hp 2000s flywheel locked up

    I am going to buy this motor, 4 stroke. The owner says the flywheel locked up in a fishing trip because of the lower unit. The lower unit can not be taken off because the shaft locked into the powerhead. It said to be caused by the bushing, or the oil pump problem by a mechanic. How bad the...
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    1977 Mercury inline 1150 distributor trigger broken again

    I bought a CDI 3736 distributor just 2 years ago and passed the warranty now. It broken again. The switch + coil have been tested to spark good. The brown port of the switch is 12+ v when not connected with trigger; becoming 8.75 v when connected with trigger. This is exactly the same situation...
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    Any alters for coil 332-4895?

    This coil 332-4895 is for 1977 mercury inline 1150. I installed a brand new old stock 1 year before and failed now. I don't want an old stock or used one any more. What alters can I use? I have tried several auto coils but doesn't spark so I must need some specific ones. Edit: pretty sure the...
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    1991 Force 90hp starting problem

    Thanks Jerry for the detailed instruction. With your help, it turns out to be a two-hours job. If I have known what to do, maybe I don't have to take out the valve. It was the tip rubber seal which totally failed. Thanks everyone's advises, I believe I have nothing to fix on this engine. It...
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