200 hp yamaha "Low Oil" light and horn
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Posted on Thursday Sep 25, 2014 at 10:40 PM  
I have a 1998 200 hp Yamaha Vmax engine.   This afternoon without warning the low oil light and horn came on 2.5 miles from the house. 
I put oil in it but the condition continued.  Oil reservoir is nearly full.  What is the next step to figuring out what is wrong?  Some site talked about a reservoir inside the Calling?SP?  and a float /pump that fills that.  And a way to manually try to turn that pump on?

I need some advice on how to trouble shoot the boat.  Thanks BJames or beans or ??
Posted on Wednesday Oct 1, 2014 at 1:55 PM  
Under the cowling of the motor there is another oil tank, you can remove the cap and fill it, or remove cap and use the oil primer bulb from your main oil tank to fill it.
Posted on Wednesday Oct 1, 2014 at 3:21 PM  
You probably have a togle switch on the left side of motor under cowling that you can use to manually pump oil into the reservior.

I don't believe in Miracles, I rely on them.
Dave Clark Hybrid/Striper/Sandbass Guide
YETI Pro staff,
Pro Staff Baitbuster Cast nets 1.5lbs per foot and six panel
Posted on Wednesday Oct 1, 2014 at 11:37 PM  
Bout time someone responded!!.  Was at Grand today and read a lot on the Yamaha Outboard forum last night and both of you are on to it.  That reservoir in the motor had gotten low.  I did not know it was there.  Think I ran my big reservoir to air bubbles recently and that caused the issue.  I removed the top cap with the wires and manually filled the reservoir and the horn stopped and I was able to drive it like a raped ape today. 
Now Dave,  The switch was there and I tried it with the key turned over but nothing.  Someone else told me the motor had to be running to use the switch properly?  I did not recheck the small oil reservoir after putting the boat on the lift this evening but some oil had been used from the big reservoir and no light or horn at any point after it cleared today.  I was wanting to know how to use that switch in the event this happens again someday!!

Thought I was gonna need some engine work but with the expertice on here I like to try to fix this stuff myself.  My second mechanic work on bass boat engines in 6 months.Woo hoo.
Posted on Thursday Oct 16, 2014 at 9:39 PM  
OK this problem still persists or exists.  I was in boat Saturday slow trolling between jugs and the buzzer and light went on again for low oil. 
I pulled the cowling and noticed the oil at the same low measure spot on the oil reservoir on the motor. With the key on and motor was actually running I tried to manually fill that reservoir with the switch beside it on the motor and nothing happened.  Not even hearing a pump come on.  I am now assuming this is an electric pump and I have not troubleshooted the wiring to this switch to see if voltage is getting there and leaving there and etc. It is interesting that the small reservoir does not go below the low oil spot but stays at that level during the limp home.  Corrected the horn by manually putting more oil in that reservoir so I could bring in the jugs with no buzzing in my ear.
Thanks for any suggestions.
Posted on Friday Oct 24, 2014 at 8:48 AM  
Need to find out what pushes the oil from the main tank to the auxilary tank. On our mercury it is air pressure, so if I were to leave the main fill cap loose it would not work.
 I know this response is a little late, you may have it fixed by now.
Posted on Saturday Oct 25, 2014 at 6:25 PM  
Not fixed or looked at since last post.  Pretty sure it is a pump that fills it and according to Yamaha forums it is an electrical problem most likely.  If electrical voltage pans out than it could be a pump.  They suggested I get a service manual for that motor which I have not done yet because I am waiting to get back up there and see if it is in my bag of papers for that boat. 
Posted on Sunday Oct 26, 2014 at 5:48 PM  
I had this problem on my 225 Merc a year or so ago.  One of the things I had to do was verify that the oil pump was sending oil to the tank on the side of the motor. The warning system on that engine has its sending unit in the tank on the side of the motor.  I tested the pump by disconnecting the hose from the pump to the tank and ran the motor to see if oil would come out of the hose while the motor was running.  I used a tank of mixed gas to do this to make sure the engine was getting mixed gas while I had the hose disconnected.  This may not solve your problem but at least it will rule out your oil pump as being the problem.  Good luck.  
Posted on Tuesday Dec 30, 2014 at 7:41 PM  
Next chapter to this story for anyone interested:  OK I took the volt meter to the motor and checked voltage everywhere - it was flowing with voltage but no pump producing oil to the little reservoir.  So disconnected the pump (hidden behind the oil tank by the way) and jumped it to a battery directly - still no pumping so I'm determining a bad oil pump on the side of the large oil tank.  Will test one more time now that the tank and  pump are out of my boat by jumping to a good battery at home.
Posted on Friday Jun 12, 2015 at 6:41 PM  
September for the first chapter of this story and June for the last.  WOW I need to get a life.
Tested the pump at home and it would not push anything. 
So ordered the correct pump for my boat that fits into the oil reservoir on the back side but does not actually touch the oil - a little cavity on the back side of the oil reservoir.  Well intended to install it for a while (months) and finally found some minutes last week while at the lake.  Very easy install with some small zip ties to hold the rubber lines to the pump.  Put the thing back in my boat and hooked up the electrical, etc.  Forgot to mark my small reservoir on the motor before turning the key but I did hear what I thought was humming.  Not sure if much oil ran up to the motor but it was 3/8 inch above the low oil line on that reservoir so I lowered the boat down and ripped it on Grand Lake for several minutes.  Now twice before this led to a horn going off - no horn this time so I ripped it some more just for good measure and the need for speed - no horn.
Think I fixed my second boat motor problem boys and girls. 
Put the boat back on the lift and then noticed my tags were 2014 - WOOOOW  I need to get a life.   

Thanks for listening. And for the various pointers thru this saga.
Posted on Friday Jun 12, 2015 at 6:46 PM  
Just noticed Dave Clark's post about the toggle switch - have not retried that but will next year when I see the boat again!!

Actually going to Canada next week for walleye and small mouth and then ankle surgery on July 13 so not much boating for the immediate future. 
Posted on Monday Jun 15, 2015 at 7:46 AM  
Crazy thing about boats.  It's Always Something!  No matter how large or small.  My RV has caught the same disease. Always something.

Living in the woods might be the only way to avoid "always something".  LOL
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