Aces High Bulletin Board
General Forums => The O' Club => Topic started by: Lazerr on August 05, 2013, 01:25:14 PM
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I have a 1990 15HP Johnson motor. Worked fine a few weeks ago on the lake, but now it wont stay running in neutral unless I keep choking/un-coking the engine. Can a bad gas mix cause this? Are my carb jets gummed up?
Any advice is appreciated. :aok
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Does it stay running when in gear?
It's likely the carb,lowspeed idle jet could be gummed up. I'd do a carb rebuild especially if it's been sitting around for any length of time. You could have bad fuel but then it wouldn't run at all.
YMMV.
:salute
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Corn-gas gotcha.... you will need clean out carb(read re-build). That fine alcohol in the gas has allowed goop to collect in the carb passages while it sat for those weeks. Always empty tank, than run till carb empty. Carb cleaner in gas tank will-not fix it. I see this on pure gas if left for extended time.
JGroth
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A carb rebuild kit and a new plug would probably do the trick.
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Yeah I had a 15 hp Ev kicker for trolling and all those hours trolling at 2 mph would really gum it up. They sell some spray crap that you spray into the motor as you gun it. that and change plugs as well as run it hard on occasion should take care of the problem.
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agree with goth on this one, the good ol corn gas :lol pull carb off, clean install.
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I assume you have to mix the 2 cycle oil in the gas? If you mix it just a little too rich the engine wont idle properly, but then it makes a pretty effective smoke screen too.
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Man I'm happy we have gas like we do here...
My parents have an old lawnmover that's been sitting outside (summer +30c winter -30c) for over 3 years with E85 in the tank (10% ethanol) after they bought an electric lawnmover. Yesterday I pressed the primer 5 times and pulled the cord, started on first pull and runs nicely.
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And another Ripl(H)ey! look at me add nothing to the conversation response. :bhead
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And another Ripl(H)ey! look at me add nothing to the conversation response. :bhead
I appreciate your very informative input on the subject of clogging carburetors.
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I appreciate your very informative input on the subject of clogging carburetors.
E85..... hmmm open gas cap for about 2 hours,leave sit a day then try it..... made that mistake once! :furious
:salute
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Thanks fellas.. going to get the carb kit and clean it out. I will be running premium from here on out. Engine runs OK under throttle in gear, but seems like it is dogging a bit. Wont run worth a crap at idle unless its being choked on and off repeatedly.
Appreciate the educated responses, this forum is a great place to come for good answers from honest community members.
:salute
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Go to Napa and get a gallon of bat carb cleaner . Tell them you need to soak a carb and they will show you what to get . I got a carb setting in a gallon now off a lawn mower . Work's like a charm but you have to let it soak for 24 hour's .
EDIT: One more tip . Get you some sea foam gas treatment and keep it in all your small engine's and your boat's gas tank . You well never have any more trouble .
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Just an update on this...
Corn gas DID get the best of me. I took the carb and sprayed the crap out of it with a high pressure carb spray. After doing that I got a fresh tank of gas with no ethanol. Popped two new plugs in, hooked the garden hose up to it and it idles like a champ with the throttle all the way down. Going to take it out this afternoon and check throttle response throughout all speeds.
I do plan to grab a can of Seafoam on the way to the lake and run it in my gas from here on out.
Thanks again! :aok
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Seafoam is a life saver . I had to fix around 20 outboards just this year from bad gas . I got to get my shop built people keep bringing there motor's to me because no one else around here can fix them . 9 times out of 10 that's the problem . Then next would be the power pack . I know my sht on outboard motor's .
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Flench..
It was still running a little weird however, after idle for a couple of 10 seconds it would still try and cut out unless choked and throttled. I am going to try changing to a new tank I got for free, with a new hose. It almost seems like there or more air than gas running into the motor.
Any ideas? Want to come to Wisconsin and fix the damn thing for good? :lol
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Check the fuel line and primer bulb for cracks,it could be bleeding air into fuel line.
At idle there may not be enough vaccume to keep the fuel flowing properly.
Did you adjust the idle screw? when it wasn't running right. Also I'm not sure if you just soaked the carb or took it apart,if you didn't rebuild it I'd suggest you start there.
That is if you don't find a fuel line problem.
:salute
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Yes, ethanol is a killer. Its a good thing the govt is looking out for us and increasing from 10% to 15% ethanol. Those idiots dont have to clean carbs. I never run ethanol in any small engine.
Non ethanol gas is a booming business, but it is so hard to find the prices are way up.
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Did you adjust the idle screw? when it wasn't running right. Also I'm not sure if you just soaked the carb or took it apart,if you didn't rebuild it I'd suggest you start there.
The only screw I adjusted was the one with the knob coming to the outside of the motor housing. I closed it one full turn, and put the knob back on, and replaced the engine cover. Will the tank ever create issues if it doesn't breathe correctly? I have a new tank to use, but the old one is hooked up currently.
Appreciate all the help!
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The tank could cause an issue with not venting properly but I would check the fuel line to be sure it works correctly. The return line could be plugged,you could have a check in the feed line,the primer bulb could have cracks,etc.
Without seeing it it's difficult to diagnose but if you try the new tank and still have a problem try a new line and see if that fixes it and if you still have the issue short of rebuilding the carb I cant say for sure.
It's not difficult to rebuild those carbs,the kit is simple and you don't need any special tools! Take it apart,soak it as already suggested,clean completely then reassemble.
Hope that helps!
:salute
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Morfiend or Flench
When I said I cleaned the carb, I basically took the top of the carb off (looks like an airbox), opened the choke, and sprayed carb cleaner down the hole... a lot of it.
The fuel line going to from the tank to engine is new, I double checked to make sure it was passing fuel, which it is. Tonight I put the new tank in, and took the top of the airbox on the carb off, and sprayed another healthy dose of carb cleaner down the chokehole. I am going to run some seafoam in the gas tomorrow and run it across the lake a few times to see if this fixed the problem.
My next question. Do either of you guys have any manuals that you would be able to send regarding the service and carb rebuild on a 1990 Johnson 15hp? OR can you point me in the right direction of the manual I would need? I am scared to do much more than take the airbox off the top as this is something new to me. I would be willing to make a phone call to one of you fellas, and definitely compensate you for the time and resources you would provide.
Thanks again!
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(http://i755.photobucket.com/albums/xx199/homersipes/08_zpsd27f1969.png)
is this what your carb looks like? I found several carbs online not sure which one is the one ya got. does it pressurize the tank, or is it a vented tank? I know some have to pressurize the tank and sme need to be vented.
(http://i755.photobucket.com/albums/xx199/homersipes/11_zps543c2ce1.png)
heres another carb that has an airbox here is the link that I found those on, might help figure out which type ya got :aok
http://www.boats.net/parts/search/BRP/JOHNSON/1990/parts.html
I found a place a while back to get manual for 5 bucks. I downloaded one for my snowmobile and it worked good
http://www.tradebit.com/filedetail.php/170662094-1973-1990-johnson-evinrude-2-to-40
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Cool link Homer,I sent one to lazerr but it was pay per view..... :o
unfortunately I think it pretty much what he's going to have to do!
:salute
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Use a racor filter and also a little inline gas filter, i use two racor filters on my yammy high thrust 50
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Sorry Lazerr . I have been afk . What's it doing now . Update ?
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2-stroke?
2-strokes are best run at full throttle, or not at all.
I have an '85-ish Jhnson 4hp SeaHorse. It has a mixture screw for low speed use which helps, but nothing changes the above fact. Mine gets funky because I use it rarely, usually only to get in/out of the dock when it is crowded or the winds keep changing, low tide and I can't get the centerboard down, etc., otherwise I am under sail. This means that I need to go out and run it full blast for a bit, every so often.
You do not have to empty the whole tank, just pull the hose off and let it run dry. I can't imagine how long it would take me to run my tank dry. I have a 3 gallon tank and I am still using the same gas from April :O (SeaFoam is your friend)
Also, make sure the vent on the gas tank is open, my son closed mine the other day (so it wouldn't slosh out) and I couldn't understand why it cut-out on me all of a sudden :headscratch:
Here, have a manual (pdf)... 1973-1990 Johnson Evinrude Outboard 2Hp-40Hp
http://www.mediafire.com/?1day5jrr8zicw (http://www.mediafire.com/?1day5jrr8zicw)
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WOW Von a 3 gallon tank ? Wish mine was a little smaller . It's a 30 gallon tank . I had around 15 gallons left in it from last year and tried to get away by just adding fresh gas to the tank . Did not work that gas from last year look like pure oil . Motor was spitting and carrying on so I finely drained all the fuel and went back with new fuel and no more trouble .
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WOW Von a 3 gallon tank ? Wish mine was a little smaller . It's a 30 gallon tank . I had around 15 gallons left in it from last year and tried to get away by just adding fresh gas to the tank . Did not work that gas from last year look like pure oil . Motor was spitting and carrying on so I finely drained all the fuel and went back with new fuel and no more trouble .
Wish I could pare it down to 1 gallon, or even 1/2 gallon. Something small enough to fit inside an inspection port and shove between the dead space in my transom
There are very few situations that I cannot sail out of (lack of wind being one of them) and having the gas tank in the boat takes up cockpit space, especially when racing and trying to move back and forth when I change tacks.
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Wish I could pare it down to 1 gallon, or even 1/2 gallon. Something small enough to fit inside an inspection port and shove between the dead space in my transom
There are very few situations that I cannot sail out of (lack of wind being one of them) and having the gas tank in the boat takes up cockpit space, especially when racing and trying to move back and forth when I change tacks.
Oh I see . I am running a 6 hp Johnson for trolling and a 90 hp to get me out there . Got both hooked up to the same tank .