Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
MNBIGBEAR

Warning Buzzer on 1999 Yamaha F100

5 posts in this topic

ok, the problem I am having is that when I run the motor at anything above 4500 rpms for any length of time, the warning buzzer sounds and the motor goes into safety mode. There is plenty of oil and the motor is spitting out water. Also, as long as I run the motor around 4000 rpms it runs smooth with no problems. I have read other numerous posts and I have been trying everything.

I cleaned the battery terminals, changed the oil filter, backflushed the cooling system and checked for loose wires.

My boat does not have the digital gauges so I am unaware if this is something related to the oil pressure or overheating.

Although the last time the buzzer sounded, I immediately took off the cover and put my hands right on the motor and it did not feel hot to the touch so I am assuming it is not overheating. Which leads me to believe that it is something to do with the oil pressure.

Could this be a bad sensor? Or could it be a weak oil pump or something. Ive called a few different shops and they all give me a different answer so I am leary that the problem wont get fixed unless I can nail it down prior to bringing it in. ANY suggestions? (Sorry about writing a book)

Share this post


Link to post
Share on other sites

I just went thru the exact same thing, for the last 7 weeks with a F115.

Diagnostics showed no codes.

Oil pressure and water temp were fine.

Spents several weeks in the shop.

Finally got it fixed on Thursday, after spending a couple hours on the water with the dignostic computer hooked up.

Bad ECM board.

Expensive to repair, but I dont care if its your employees, your outboard or your wife, if you cant trust it its not worth owning.

Havent gotten the bill yet, but the number $1100.00 for the ECM was mentioned a couple times.

Share this post


Link to post
Share on other sites

That would really sting....I did buy a water pump rebuild kit with a new impeller. Figured I would start there. Should be here in a day or so. Now im really crossing my fingers that this will take care of it. By the way, I did a little more checking and the water stream seemed a little weak so im thinking it may be an overheating problem.

Share this post


Link to post
Share on other sites

Good chance the water pump is your problem. I had the same problem with my 150 a while back.

The new impeller took care of it.

Good luck - be optimistic!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0



  • Posts

    • 6 months later and he is home
    • Three favorites at the moment.  By the time they upload, I may change my mind.
    • A few from Maplewood State Park on April 16th.  Non-professional, but they stood still long enough for me to get 'em.
    • You might be able to figure things out this week.  How big is your sump basket?  Is the  pump kicking in now?  Sit there for 15 minutes and count the number of times it cycles.  That should give you a decent idea on how much water is coming in.  Then figure out about how high the water has to go before it flows by gravity.  The spec for the pump will say something like that it can pump 2,000 gph at 10 feet of lift.  (the gph drops dramatically the higher it has to pump the water).  The answer to your specifics will give you an idea of how big of a pump you need.  If you match the size of the pump as close as possible to the amount of water your will face you can maximize the amount of time the battery backup will last.   Faced with this problem I took a standard boat sump pump and modified it so I could hook up a garden hose.  The I took an old shop extension cord and wired the pump so I could hook it up to a car in the garage.  So just prior to having Noah float by I could hook things up in the garage and be good to go for as long as I had gas in the car to pump up the battery.   Now that I am adult I bought a generator and wired the house to take care of things.
    • Inevitably at least twice each season I will leave the house, drive 45 minutes and walk some of my favorite grouse spots for hours and hours, seeing nothing.  Admitting defeat on that day, I will drive 45 minutes back home, only to find a covey of birds in the driveway...
    • Colonel E.H. Taylor Small Batch Maker's Maker's 46 Bulleit Glenmorangie Highland Single Malt   Copperwing Distillery in St. Louis Park has a nice smooth whiskey. Supposed to introduce a new bourbon in a couple weeks too.
    • Hey featherslayer, you gonna register that nice bird of yours pretty soon?
    • cool find!  sure looks like a Swainson's.  
  • Our Sponsors