(need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always srt

[seabasss]

Hi their,
i just traded my dirt bike for a 1996 14' nautica ridged hull inflatable with a 90 horse power mercury sport jet.
when buying it i had the seller meet at a dock and i took it for about a 5 minute rip. it seemed to run ok and idled.
about an hour later i took it to a lake and it woudnt sart? their was gas dripping from the carbs so i set it wide oped and turned it over till she started.. once out on the lake it toped out at about 28mph eventually it cleared up and was cruising at 35mph.. once i put it in neutral or trolling speed after about 2 minutes the motor died... got it started after about 5 starts and took off again.. after taking it out a few times and dealing with these problems it seems to be harder and harder to start the boat. last time i tried to launch the boat it wouldn't even start.
THINGS IVE TRIED:

*PULLED THE CARBS OFF AND CLEANED THEM OUT
*PUT SEAFOAM IN THE TANK --- (but havent had the engine running enough for its effect to take) place
* SLIGHTLY ADJUSTED THE FLOTE LEVEL TO HOLD LESS FUEL --- (BECAUSE THE CARBS WHERE FLOODING)

ONE THING I NOTICED: I JUST PULLED THE CARBS OFF AND SPRAYED FUEL DIRECTLY IN THE ENGINE AND IT STARTED RIGHT UP !! SO IM GUESSING THE PROBLEM IS ( CARBURATOR ) AIR FUEL ?

ANY HELP IS MUCH APPRECIATED IM EXTREMELY LOW ON FUNDS AND JUST WANT TO GET THIS RUNNING BY THE WEEKEND FOR CAMPING !
thanks!

 

[Anders67]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

Hi.

Look in left side of the carbs. There you have a thin plastic hose (yellow originally). See so it?s not clogged. Check also so it is open in to carb house/ bowl on both carbs, in the connections of the hose.

Check so needle valve close on both carb and are ok. The flote shall close at straight level, leveled vith bottom of carb. Don?t put the gas level to low in the carbs, it can make the engine run on to lean mixture.


On mine the gasket leaked between bowl and carb also.



If all that ok.

Check also so the auto enritchiner closes when hot ( the auto choke on this engine).

And so all reeds are ok.



If all that is ok.. But still problem. Check the fuelpump diaphrag. and valves, and gaskets,filter.





http://forums.iboats.com/showthread.php?t=415332

Last part you have manual.

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

Hi.

Look in left side of the carbs. There you have a thin plastic hose (yellow originally). See so it?s not clogged. Check also so it is open in to carb house/ bowl on both carbs, in the connections of the hose.

Check so needle valve close on both carb and are ok. The flote shall close at straight level, leveled vith bottom of carb. Don?t put the gas level to low in the carbs, it can make the engine run on to lean mixture.


On mine the gasket leaked between bowl and carb also.



If all that ok.

Check also so the auto enritchiner closes when hot ( the auto choke on this engine).

And so all reeds are ok.



If all that is ok.. But still problem. Check the fuelpump diaphrag. and valves, and gaskets.





http://forums.iboats.com/showthread.php?t=415332

Last part you have manual.

thanks for the response !
its has 3 carbs just so you know i will look into your suggestions in the morning!! im used to working on 125cc 2 stroke dirt bike engines so this is a little harder then what im use to.. iill re post when i try your suggestions thanks

 

[Anders67]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

Correct. Was thinking on the 120 engine. You have 3. Here it?s early in the morning

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

Correct. Was thinking on the 120 engine. You have 3. Here it?s early in the morning

so would your suggestions stay the same?

 

[Anders67]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

so would your suggestions stay the same?

Yes it's the same. If you look in to the link i put in, you see under 3-3C something, you have the carbs and fuelpump etc..

Regards Anders!.

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

So i checked the reeds they look fine,
i wasnt sure what you ment by a yellow plastic hose? the only thing close is the fuel line in. and the overflow on the bottom carb only,
they both looked fine.

i think i might have found the problem, the float needle on all three carbs are getting stuck in the closed position so no fuel is getting in to the bowl
but i remember when it wasnt starting for me their was fuel dripping from the carbs so unless one or two float needles are getting stuck and the other carb is flooding.. thats the only thing i can think is happening.
any idea on how to free up the needles so they glide smoothly? i tried cleaning them and it worked for a minute but they still get a little sticky.
thanks!

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

I freed up all the float needles and it just wont start ?? no:facepalm:

 

[Anders67]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

Hi again.

You have good spark on all cyl?.

What happen if you use a little start gas ore spraying fuel right in to the carbs. And turn the engine over?.

If it?s start then , look on the Auto enritchiner, and check the timing so it?s right.



Look in section 6, side 6-4, over the a in picture you see the tube/thin hose going between the carbs. It?s inportant that the venting tube and the connection in to the carb are free from dirt. Try by blowing through them all so they open.

Yes i know the needle and seats are tight. try with some cleaning solvent, and tops ore something that can?t destroy the seat. Also check on the other side/ outside of the needle valve, there the fuel hose is comming in to the carb. I took of the fuel hose-connection on mine carbs and found that it was debris laying there, acting as a valve sometimes and shut off the fuel flow.


I had a similar problem on mine in the beginning, dripping out of carbs. Check the level on floater and so the needle-valve shut off the fuel flow as it shall.

Check so you have a gasket in top of the bowl/ bottom of the carb body, and also gaskets on the centre screw in bottom of bowl. One on the inside and one on the outside of the bowl.

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

i fixed the leeking fuel, it was just a bad gasket on one of the float bowls...
ill try and look into the auto enricher im not very familiar with them but ill try..

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

ill check spark in all 3 cylinders right now.
and i did try and spray gas in where the spark plugs go and it didnt fir up, but when the carbs where off i prayed some in the intake with no carbs and it started right up. thats why i think its carbonation problem ??

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

Hi again.

You have good spark on all cyl?.

What happen if you use a little start gas ore spraying fuel right in to the carbs. And turn the engine over?.

If it?s start then , look on the Auto enritchiner, and check the timing so it?s right.



Look in section 6, side 6-4, over the a in picture you see the tube/thin hose going between the carbs. It?s inportant that the venting tube and the connection in to the carb are free from dirt. Try by blowing through them all so they open.

Yes i know the needle and seats are tight. try with some cleaning solvent, and tops ore something that can?t destroy the seat. Also check on the other side/ outside of the needle valve, there the fuel hose is comming in to the carb. I took of the fuel hose-connection on mine carbs and found that it was debris laying there, acting as a valve sometimes and shut off the fuel flow.


I had a similar problem on mine in the beginning, dripping out of carbs. Check the level on floater and so the needle-valve shut off the fuel flow as it shall.

Check so you have a gasket in top of the bowl/ bottom of the carb body, and also gaskets on the centre screw in bottom of bowl. One on the inside and one on the outside of the bowl.

really strange??? their is no spark in any cylinders?? i checked just the top one the other day and their was spark ? no nothing and its only been sitting in the driveway since...... so i guess it is a spark issue now,

 

[Anders67]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

MMMM. Sounds like mine engine in April. Was like chaseing a demon. Checked one problem and it moved to another place on the engine.

Ok electric. Do you have the old ingnition system ore the CDM model?. What OEO number do you have on the engine?. Sits a stick on top of flyweel cover and one in right inner upper corner on the engine.

You can also check in the link. Section 2a and 2 b , there you see the two types of ingnitions.


First and cheapest to check is.

Yellow/black line in engine harness (left side) is kill switch, killing spark on all cyl. Disconect and see if sparks back. if back Then you have a problem in ing. switch ore leads/harness.

Next rev limiter (black plastic square box on left side engine) disconect ande se if spark back.

Check also so you have good grounding on all lines, especially on the engine harness for ingnition etc., that shall be grounded. The voltage used to trigg the CDM to let go of spark is low. Therefore it?s important that the ground wireing and all connections are good.


Here is a good check list for the new CDM model ingnition.

http://www.cdielectronics.com/InstallSheet/114-7509.pdf

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

WHEN YOU SAY LEFT RIDE OF ENGINE.. DO YOU MEAN IF YOU ARE LOOKING AFT.

ill check the oeo number tomorrow im not sure what ignition system i have ? all the grounds and wire look pretty corroded and old, so ive ben cleaning them up and testing the wires but still not solving the problem.
ill try the kill switch wire next..

 

[emoney]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

Port side, so if you're in the boat, on the right.

There's a sticky at the top of this forum that's very helpful about "Red Stator" etc., etc. Still seems odd you lost spark all of a sudden. Make sure for 100% that you're in nuetral. There's also a "kill switch" (just a reminder). So you know, that's a Force 90 power head. Usually pretty simple and reliable once you get past the ignition issues. Also, read the "Link and Sync" thread in the Chrysler/Force forum. You'll need it.

You don't wanna start these out of water because the ride seal WILL blow and getting really hard to find. Good luck.

 

[Anders67]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

WHEN YOU SAY LEFT RIDE OF ENGINE.. DO YOU MEAN IF YOU ARE LOOKING AFT.

ill check the oeo number tomorrow im not sure what ignition system i have ? all the grounds and wire look pretty corroded and old, so ive ben cleaning them up and testing the wires but still not solving the problem.
ill try the kill switch wire next..

Yes looking on it from front. Right side when you sitting in boat.

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

yea im in neutral and the kill switch is off, and i have ben trying to start it out of water but it has a hose hook up for coolant so i assumed it was fine.

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

i think maybe its a 95 power head it says xp95 on the engine next to the serial number... im not to familier with boat engines so ?

 

[Anders67]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

There should be a little sticker/note on the flyweel cover and just beside exhaust manifold. Saying enginenummer 0E0XXXXXXXX pump number 0E0XXXXXXX.

You can run it on drivevay. But be shure you disconnect the whater hose comming in the backend of the pump, up on right side of engine and put the whater in there. Thats the cooling whater. If you have a conection on the upper end of the head, that?s only for flushing out the engine of debris and salt whater.

Put low whater pressure, like 1-2 " if you hold the garden hose straight up before connection. And don?t WOT the engine, ideling and low rpm works.

Section 1 side 1-11 in the link before you see where to connnect the garden hose.

 

[seabasss]

Re: (need some help) 1996 sport jet 90HP carb problems !!! wont idle and wont always

ive never run it more then 30 seconds in the driveway,
and i dont have a flywheel cover? its completely exposed. only numbers ive found are the serial on the top of the engine next ton the fly wheel

earlier i disconnected the rev limiter and i turned the motor over and saw one really strong spark,,, and then it just stopped, i kept turning the motor over and couldnt get it to spark again ?

all the wiring is pretty old and corroded so maybe just need an overhall ?