what causes the buzzer to go off on a 1996 yamah 115 two stroke

[ablock]

I have a 1996 yamaha salt water series two stroke that i just cant solve a over heat problem and or feul problem while trying to jump on plane it seems to bog down. Not all the time but on sertain ocasions and the alarm goes off , turn it off wait a bit turn it in goes into plane if i go.easy on the throtle and slow on tilt and trim it just works great, but if i due this fast like i used to be able to it bogs down and not all the time but some times alarm goes off today i also noticed that the engine boged down as soon as i hit choppy water seems to me like if thier is any change in angle boat boggs . I am begining to think it is like a fuel issue but will a feul issue cause the alarm to off o forgot to mention oil and feul are mixed together

 

[Art Bernard]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

I'm not really familiar with that motor, but I have dealt with some fuel problems. Do you run ethanol or non-ethanol fuel? Ethanol fuel will clean the crud out of your tank, lines, filter,etc... and despite the filter it can wind up in your carbs clogging up the jets. What I suggest is to eliminate the problems or probable causes with your fuel system. When I had my problem (hard starting, bogging, lack of power) I compleatly went thru my fuel system. I pulled the tank and cleaned it, replaced all fuel line from the tank to the engine and evan the the ones under the cowling, replaced all fuel/water seperators and filters and had the carbs cleaned and rebuilt. I have not had a fuel issue since and this is something I have done with the last 3 boats I've owned. Also I began using the marine stabil and I will not let ethanol fuel sit in my tanks for longer than 2 months. I know it sound kind of drastic, but with all the rumors, good and bad about ethanol fuel I figured I'd rather eliminate that as a potential problem than deal with issues cropping up constantly. Look at it this way, aside from some labor on your part (fuel tank), replacing hoses and filters is relatively cheap and the bigest cost is getting the carbs done which is usually around $100, but once this is done it will compleatly eliminate the fuel system as a source of trouble and you will have allot more piece of mind. I see allot of people in this forum with fuel problems and it just seams to me that if they would just take that extra step they could be done with it ya know, instead of going nuts trying to track down which hose, or what filter, or is it my tank causing the problem. It may or may not be the cause of your problem, but I think it's still very worthwhile to do. Just my 2 cents man and I hope ya get her figured out. Luck too ya.

Art

 

[Bamaman1]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

The lack of oil in the big remote oil tank is the first thing that will make the alarm sound. Even if you're not using the oil system, you'll need to put some oil in the tank.
When the alarm kicks in, you should have an electronic governor kick in limiting your rpm's.

As far as overheating: Have you put a new impeller in the boat? Have you replaced the little thermostats on the heads? This is something you cannot overlook, because if the engine gets too hot, it's going to partially seize--and completely bog down.

Bogging down: A boat often bogs down upon acceleration due to fouled plugs and/or dirty carbs. Cleaning the carbs is no big job--maybe 1 hr. job.

Unless you're ready to repower your boat, you really need to address these problems now. The Yamaha 115 is a very durable motor, but any outboat problem will not go away--just mushroom out.

 

[99yam40]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

Remote tank float switch will not alarm, only the one on the motor brings in the alarm

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

I have replaced the impeler and all the oil injection was removed when i bought boat, i have had the boat for 5 years and never an issue until about 6 months ago boat has never had thermostats i live in south texas it never gets cold here and i run very shallow so its very easy to plug stats up, so i have a good water flow could it possibly be that the alarm is going off due to fuel starvation i have never cleaned or serviced carbs will due that asap

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

Forgot to say when alarm goes off rpm dont go down boat will stay at operating speed no governing effect takes place what i due is slow down and buzzer goes away forgot to mention heads where removed cleaned and gaskets replaced every thing torqued to specs what seems to be a bit wierd is that this will only happen sporadicaly it is not a constant thing that is why i ask will not enough feul cause alarm to go off

 

[99yam40]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

lean running motor can cause more heat in cylinders but usually it just pops a piston instead of bring in an alarm.
Have you tested you overtemp alarm system to see if it is doing what it is suppose to?
as it should limit RPM to around 2K

Running a water cooled motor without the thermostats is not real smart as the motor need the restriction of the thermostats to make the water circulate properly through the motor and heads, without it the motors end up with some parts hotter that the others. They are designed to have the restriction to cool properly and I have never heard of one plugging up from running shallow water, that may stick from salt corrosion or just go bad

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

I am going to install the new thermostats that i orderd how can i chek the over heat alarm that turns the revs down to 2k how due i find out if working properly

 

[99yam40]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

I am not positive on that motor but You might try pulling the pink wire off of the temperature switch and grounding the wire on the harness side to the head with the key on and the alarm buzzer should sound. Only way to check the reduction in RPM is while running as far as I know, I think it will retard the timing as my C40 does to accomplish this and is easy to see with a timing light

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

Thanks guys for any and all info i pulled carbs and cleaned them bottom carbs had some contaminants but nothing major i instaled water pump impeller and housing last year and i am begining to suspect that local dealer who was in a hurry gave me the wrong water pump kit i am a diesel mechanic and dont know much about outboards but have had my share of tinkering with yamaha banshees two strokes kinda the same nonetheless having you guys answer questions gives a bit of confidence to people like me who are not yamaha service techs thanks guys seems to me that what is going on is an overheating issue

 

[99yam40]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

If you have an alarm with not RPM reduction then it should not be oil level or over temp

do you have wires to the fuel filter on the motor?
If there is then there is a water detection float in it and it could be bad or have water in it.
As I have read some motors will alarm at low voltage , but do not think yours to be one of them.
But of course I have no real idea on yours

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

no i dont have one of those filters i am going to go buy a fuel water separator tomorrow and instal it, i hope the new local yamaha dealer has a water pump kit in stock if not i will have to order it but if i recall when i bought the water pump kit the guy was being a bit of a jerk and told me i would not know how to install the water pump, any way i will wrench on it tomorrow its to late right now i will post outcome tomorrow is their a way to inspect water impeller for damage

 

[jeffersondodson561]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

As with all motors, it is a good idea to bring in the model and serial number when you purchase parts. If they are a Yamaha dealer they can enter in the serial number and get the correct engine all the time. Yamaha switched to a new parts look up a few years ago and I had found it a little bit challenging switch from the old software. Have you checked for any pink wire chaffed/grounding against the block. Pressure relief valve may be not seating correctly. If after Tstats are checked I would check there.

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

Is the pressure relief valve the poppet valv if it is i instaled a new one new spring and housing old one just fell apart in my hands after removal i have a question might be dumb but any way when water enters the block whare does it go is thier an exit behind the cylinders that may b cloged

 

[jeffersondodson561]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

It is possible for it not to seal. The pressure from the water pump will enventually overcome the poppet valve at any rpms. At lower rpms the Tstats will work more at higher rpms they work less because the poppet valve is always open. This is where you see people talking about water pressure being at around 14 psi. If the poppet valve is off it's seat the water cannot build up pressure to make the Tsats work properly and vice versa if their is something wrong with the Tstats. I would check the Tstats first because they are easier to get to.

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

Ok guys this is what i did today i removed lower unit to inspect water pump. Upon removal first thing i see is that the water pump housing did not seem to be senterd right in the middle of the long shaft that connects lower unit to power head. I then dissasembled the rest of the pump and notice after a long inspection of schimatics on yamaha forum that ones of the washers that go inside of assembly is missing, diagram shows three and my lower unit only has two i have a wavy washer and a flat i am missing another flat one. Ok i also removed the lower stainless steel plate and spot a round o ring seal that kinda looks like a washer, this seal goes on the shaft and seals water that is being sucked in by water pump it lloks to me like it is not duing its job can i be loosing pressure through thier, orderd a new one just in case but can those two things be the culprit of lost water pressure ? I am now puzzeld i feel like i am working on a peninsular 6.5 turbo diesel (ENGINES ON EARLY CHEVY PICK UPS AND HUMMERS) ALWAYS BREAKING DOWN WITH A DIFFRENT ISSUE

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

could thier be any other factors for overheating

 

[99yam40]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

Why do you keep going back to over temp. if it is not going into RPM reduction just alarm?
Is there an indication it is an overheat?
You need to have it checked to see if everything is functioning as it should if you can not.

 

[ablock]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

yea good idea i started looking again and i remembered that i had a similar problem like this before and it was when my feul pump started going bad so i checked the primer bulb and it would get pressure but my feul pump was driping gas. i replaced feul pump about 3 to 4 years ago, could it be that since i pre mix my gas my feul pump goes bad so quick?

 

[jeffersondodson561]

Re: what causes the buzzer to go off on a 1996 yamah 115 two stroke

first thing i see is that the water pump housing did not seem to be senterd

Normal