force 120hp 98' running problems

[yee_RULES]

hi everyone i have this problem:
i have a 120 hp force 98' outboard two stroke motor wich was runnig perfectly, the first problem was the that the engine started perfectly only accelarated then tho motor worked perfectly. just in sometimes when it was in neutral and whe push the handle to go forward or backwards the engine stoped. we fixed accelerating a little more. then here comes the real problem we warked the motor for 2 hours perfectly.

the next time we used the boat the motor tookes a long time to start, and we tryied accelerating a little more and it work but it keepes shuting down 10 secs after started
we took it to the mechanic and he said the stator was broken, so we bought a red stator making sure it was the one for our motor, we send the serial number, and now with the new stator keeps making the same thing i guess is not the stator????? BUT I DONT KNOW; I WILL APPRECIATE any help thanks,

 

[roscoe]

Re: force 120hp 98' running problems

Welcome to iboats.

3 things make your engine run.

1- sufficient compression in the cylinders
2- spark from the ignition system
3- fuel delivered into the cylinders

Symptom of starting, then dying, would lead me to believe you have compression and spark. But spark and compression should be checked, just to be certain so we can eliminate them as possible causes of your troubles.

#3, a fuel delivery problem, would be the most likely.
The entire fuel system should be checked.
As well as your starting procedure.

Some things to check:
fuel pickup in the tank could be clogged with dirt
tank vent is clogged or closed
primer bulb is faulty
air leak in the fuel line
fuel pump not working
Carbs dirty/ jets plugged
choke not working

are you activating the choke?
The choke is actuated by pushing the key IN, while you are turning the key to start.

are you pumping up the primer bulb before starting?

 

[yee_RULES]

Re: force 120hp 98' running problems

thankyou roscoe, indeed your opinion is completly right and thank you for helping, we recently bought this bayliner capri 1800ls wich is the one that has this motor, we checked the compresion and it was almost as new. this motor as you probably know has a little gas filter inside, the first thing to repair whas that little filter becaouse was dirty so que bought this extra gas filter the two carbs where complettly disarmed and cleaned with a special carb cleaner, so whe discard compresion and fuel delivery,

i have this article that the dealer send me wich says that the stator should have somo tipe of resistance in the cables (there are 4 cables, two green/white and two yellow) the resistance shoud be in a range of 600 and 700 omhs according to this article, the new stator only gets to 450 resistance with the green/white cables
the old stator is damaged and has two more extra cables i think black and gray and has a 640 resistance between the green/white cables i guess the new staor is not for the motor but i dont know i am completly new with these stuff, so now the question does it matter????
according to the dealer it doesn't the two estra cables missing in the new stator are the ground cables wich are now addapted to the body of the new stator (according to the dealer) thank your help

 

[yee_RULES]

Re: force 120hp 98' running problems

the gas filter that we bought is full of gas and also the manual pump is full (feels hard) is there another gas pump????? and why we have to accelerate the motor to ge it running (i mean just acelerating no to go forward) i dont shift jus acelerate)and then works a few seconds and dies, this filter is delivering pure and clean gas to the motor and it's always full, i recognize when the motor runs out of gas, and i dont think thats the problem but anyways i not the expert i will check on that again thanks

 

[woodnknots]

Re: force 120hp 98' running problems

From what I can gather from your post, I had a very similar problem that began very suddenly. My motor ran very well one day, then the next day I started it at the dock, it ran well, then when I started out on the water, it died. It would start (with some coaxing) and then die after a few seconds. The only thing I did differently from one day to the next was fill it with gas I don't usually use. It turns out that the gas was bad. It doesn't take much water in the gas to make a marine 2-stroke quit on you. The water can accumulate in the bowls, allowing the engine to run momentarily, then cutting out as the fuel becomes inflammable when atomized. I emptied the tank and put all that gas in my truck (which ran fine). I refilled the tank, and have had no problems whatsoever since. I put some fuel in a jar and waited for it to separate, and it never did, so that tells me that you don't necessarily have to have enough water in the fuel to see for it to have devastating effects on your engine.

Hope that this helps!!

 

[yee_RULES]

Re: force 120hp 98' running problems

hi woodenknots thankyou for replying it can be a good sulution i'll try using a portable gas tank with good fuel, thanks again

 

[roscoe]

Re: force 120hp 98' running problems

woodknots is correct on the bad fuel advice, it only takes a little bit to fowl things up.

You need to get the bad gas out of the fuel line also.

Yes, your motor has another fuel pump.
It is a square block, about 2.5" square.
It works off the internal compression pressure of the powerhead.
There are diaphragms inside , that can wear out or tear.

You need to test for spark on each spark plug.
You can get a $7 spark tester from any auto parts store, and you plug it in between the plug and the wire. This will tell you if you have sufficient spark.

Stators: They have been upgraded over the years, and yes, some of them have extra wires on them now.
I do not know which brand stator they sold you, and have no way of knowing what the resistance reading should be.

Is there any resistance between the two yellow wires?

 

[yee_RULES]

Re: force 120hp 98' running problems

no theres no resistance between the two yellow wires, i ship the package back with the old stator to, just to let them know the diference between both, i know now that the missing cables in the new stator are not there because new technologies, but if the resistance between those green and white cables is lower than it should, would it work the same??? thank again

 

[roscoe]

Re: force 120hp 98' running problems

CDM ignition stator test procedure:

Disconnect the green/white and the white green leads.
Connect the red meter probe to the white/green wire.
Connect the black meter probe to the Green/white.
Resistance should read 500-600 ohms.

Also, to check for a grounded condition:
Connect the black probe to ground, and connect the red probe to the green/white, it should read infinity, or no continuity.

Then check it to the white/green wire.