Evinrude 15hp 1989 BIG problem

[Dantoy]

Hi everybody, My name is Dan and im from canada. Its my first time on your forum and i found good info about boat stuff.

I recently buy a 14'' foot fishig boat with a 15hp evinrude 1989. The guy said me the motor run well and i beleve it without tryin (MISTAKE !). The motor dosent run good at all. Its easy to start but he run only at full speed and he need some choke to keep running. I tried all the ajustement and timing i can but i fixed nothing.

The thing i did: I bough a new rebuilt gaz pump kit, i cleaned all the carburator without a rebuilt kit cause he looked to be clean. I soaked it anyway. I dont remove the ''frost plug'' on the top but all the hole flow good with carb cleaner and i blew air in all hole. I did a leaking test, with brake cleaner (sprayed everywhere on the motor during running) all seem to be good. I remove the flywheel to look at the crank seal he was good. Fire is a nice blue spark, seem to good too. I re-time the carb with the fire plate. I think is barely all the thing i did hahah.

Im really in deep **** cause i bought this boat about 2 month ago and i never put it on water Im a mecanic and i work in a BRP dealer. I know couple thing about outboard but its not my main interest.

If someone can tell me something i dont test or i did wrong, say it now ! I want to go fishing before winter !

Thanks every body and sorry for my poor english its not my main language.

 

[nwcove]

Re: Evinrude 15hp 1989 BIG problem

hi Dan, id start by rebuilding the carb with a kit, and do remove the welch plug. clean all the holes with a small wire and use compressed air. do not over look anything in the carb.....clean it well.

 

[OptsyEagle]

Re: Evinrude 15hp 1989 BIG problem

Have you tried turning the rich/lean adjustment counter-clockwise to enrichen the gas mixture. When you choke it, that is all you are doing. If turning out that knob does not help then I would assume that your carb is still dirty. I would then suggest buying a rebuild kit and paying close attention to cleaning the slow speed jet and that frost plug area (called a core plug. Remove it, clean it and put in a new core plug).

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

Have you tried turning the rich/lean adjustment counter-clockwise to enrichen the gas mixture. When you choke it, that is all you are doing. If turning out that knob does not help then I would assume that your carb is still dirty. I would then suggest buying a rebuild kit and paying close attention to cleaning the slow speed jet and that frost plug area (called a core plug. Remove it, clean it and put in a new core plug).

Seriously, the first time i open the carb he look very clean, no dust, no vernish, no nothing. I passed a small pin in all hole, i blow carb cleaner and compress air in. They flow nice.

What i have under the core plug ? Is it a couple of air circuit ? Cause with all the carb cleaner and compress air i blew thru the hole of mixture ajustement needle its supose to be clean. I soak it in a really strong stuff i assume the carb is clean, all the carburator i dit in my life pass in that stuff and always work well....

 

[AlTn]

Re: Evinrude 15hp 1989 BIG problem

is this a plastic top carb?

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

is this a plastic top carb?

No steel bolw and metal top

 

[2manband]

Re: Evinrude 15hp 1989 BIG problem

Id do a carb kit and replace all the seals. Air leaking in can have the same effect on the mixture an fuel being kept out

 

[AlTn]

Re: Evinrude 15hp 1989 BIG problem

can you give the model no. or post a pic?..all the 1989 15 hp. evinrudes came with a plastic top carb..you may have an older motor or an '89 that has mxed % matched parts....try leeroysramblings.com..outboard motor related articles...9.9/15 hp maintenance and repair to sorta see where you're at with this one

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

The model numbar said its a 1984 but is not. De idle adjustement is from a late 1987. I dont really know what is the year of my motor but is late metal top carb and early 87 and more.

Anyway, tomorrow ill remove the core plug on top.

Ill give u a come back soon.

Thanks everybody.

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

OK im back.

Today i disasembly all the carburator again. I remove the 2 core plug, one on top and one on the side of carb. Both are clean and work good. I re-clean and pass a lil steel rod on each hole i see. Everything was good. I put the carb back on the motor, try to start up, he still running on half choke and have no idle.

Im very mad about this situation, im a mecanic and i cant fix the problem. I dream each night about this damn problem.

I think the next step will be to remove the engine and inspect the lower crank seal. Im mecanic about the last 10 years and i never have to change a lower seal. Maybe it is my problem ?

Anyone can help me with this problem ? Anyone know something i dont tested ? Please give your advice about this issue cause he will serve at boat anker if he still run bad.

Thanks again and sorry for my bad english i do my best

 

[mark1961]

Re: Evinrude 15hp 1989 BIG problem

Run a compression test before you do anything else.....

http://forums.iboats.com/showthread.php?t=313963&highlight=compression

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

Run a compression test before you do anything else.....

http://forums.iboats.com/showthread.php?t=313963&highlight=compression

115 lbs each cylinder

 

[webrx]

Re: Evinrude 15hp 1989 BIG problem

my buddies 18 is real touchy on the mixture screw. an 1/8 turn makes a difference in running well or not. I shut it all the way down, and opened it one turn, got it running and the setting on his is about 7/8 open. Where is your screw set, try 1.5 and then slowly turn it in just a little at a time to see where she dies, then open 1/8 turn and tweak it a tiny bit at a time from there.

If you have to choke it to keep it running, you are getting too much air from somewhere.

d

 

[mark1961]

Re: Evinrude 15hp 1989 BIG problem

What's your static setting on the low speed needle?

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

What's your static setting on the low speed needle?

For my mixture screw i tried all the possibility, full open, full close, 1/8, 1/4, 5/16, ect

I can almost say its not a carb problem. I know how to fix a carb and how to tune it and thats dont work.

The only thing im not 100% sure is the timing between fire plate and carb roller.

I did couple test but im not sure at all.The timing i did is: I aligned the mark on the cam plate with the cam roller. I put a .030'' air gap between the roller and cam just before the throttle plate start to open. My twist throttle is at the start position and the throtle plate start to open just when i past the start mark on the twist throtle. Is it clear ? Is it right ?

Can i do a pressure test without removing the engine ?

 

[AlTn]

Re: Evinrude 15hp 1989 BIG problem

just think of the markings on the tiller handle as relative guides not absolute ones..forget the air gap..align the roller so the center of it is just past marking on the throttle control cam as the throttle plate is opening..set the idle mixture screw to 1 1/2 turns out from a light seat...choke full...then advance the throttle as far as it will go in neutral < disregard the start marking on the tiller handle >...once the engine fires, reduce the choke < may be able to kick it fully off >, reduce the engine speed and let it warm up some....the actual idle speed should be set with the motor warm, in gear, and pushing the boat

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

just think of the markings on the tiller handle as relative guides not absolute ones..forget the air gap..align the roller so the center of it is just past marking on the throttle control cam as the throttle plate is opening..set the idle mixture screw to 1 1/2 turns out from a light seat...choke full...then advance the throttle as far as it will go in neutral < disregard the start marking on the tiller handle >...once the engine fires, reduce the choke < may be able to kick it fully off >, reduce the engine speed and let it warm up some....the actual idle speed should be set with the motor warm, in gear, and pushing the boat

LAWL OMG i feel like im in the heaven with god next to me drinking a good beer. I know how to start a engine dont worry. Mine work everything except good. The carb adjustement dont work anymore, the rpm of the motor go to 1/2 throtle to full throttle on half choke.

Thats it thats all.

I try to find not an ordinary solution.

 

[mark1961]

Re: Evinrude 15hp 1989 BIG problem

Deleted due to lack of interest.....

 

[Rick.]

Re: Evinrude 15hp 1989 BIG problem

Hello Dan. Canada is spelled with a capitol C no matter what your heritage is. Having said that what part are you living in? You might have some sort of air leak either in your fuel line or at the carb. to intake gasket or even in the intake manifold. Brake cleaner is not a good idea for checking as it has a low viscosity and it is real hard on everything it comes in contact with especially anything plastic. Best of luck. Rick.

 

[Dantoy]

Re: Evinrude 15hp 1989 BIG problem

Hello Dan. Canada is spelled with a capitol C no matter what your heritage is. Having said that what part are you living in? You might have some sort of air leak either in your fuel line or at the carb. to intake gasket or even in the intake manifold. Brake cleaner is not a good idea for checking as it has a low viscosity and it is real hard on everything it comes in contact with especially anything plastic. Best of luck. Rick.

Hello Rick, sorry for the little ''c'' i put in the canada, but this country dont deserve a big C ... im from quebec and i hate everything about canada. i want to be a americain citizen im still waiting for my green card.LIVE FREE OR DIE

Thats what i though, air leak somewhere. I know brake cleaner is not the best way to find a leak but its work good on every engine i tested.

Can i take a look at the lower crank seal without removing the engine ? If i put 5 psi air pressure on the spark plug hole, can i feel some air blowing by the intake or the reed valve supose to block any leak ?