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Dave in PA 
Orange Level
Joined: 13 Sep 2009
Location: Mars/Wexford PA
Points: 2627
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 Topic: Need help ? Lawn tractor
Posted: 09 May 2010 at 5:34pm |
I have a lawn tractor for grass cutting, and it has a B&S 18.5 hp, twin engine.
It starts fine, very quick, the idle is rough, up and down, higher idle is more stable, a little rough!
Pull the chock out, it is better, BUT NOT GREAT! I think that is hungry for gas!
I have not done anything to it yet, But I think it is a float issue??? I am right? any ideas? I will clean it out as needed, but, am I missing something? any better ideas? It did get wet over the winter, could the fuel, carb, have rust?? the plastic tank looks fine.
Thanks, Dave
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JCinPA
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Joined: 12 Sep 2009
Location: Turbotville,Pa.
Points: 75
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Posted: 09 May 2010 at 6:16pm |
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Dave maybe just needs fresh fuel. This fuel today does not keep well over winter. JCinPA
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Dave in PA
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Joined: 13 Sep 2009
Location: Mars/Wexford PA
Points: 2627
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Posted: 09 May 2010 at 6:21pm |
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JC , I forgot to say that, but, it was, new from the station ( Exxon ). I did drain the tank, put new in! Thanks,
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22823
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Posted: 09 May 2010 at 6:27pm |
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Take the bowl off the carb and clean it out. While you at it drain some gas out of the tank through the line to the carb to make sure it isn't blocked partially. While you have the bowl off you can check the float levels. Then you might need to tweak the carb a little.
Since I have been using 10% ethanol( when it was first available) I have never had a problem with gas in engines setting over winter 6 or 7 months.
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ChuckLuedtkeSEWI
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Joined: 11 Sep 2009
Location: Jackson, WI
Points: 1826
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Posted: 09 May 2010 at 6:29pm |
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I would take the carb off and clean out the float/bowl and spray the carb out with carb cleaner good and then blow it out with compressed air. With this new fuel with all the additives, I don't know how many times in the last ten years I have dealt with carb problems due to the gas. Try there and then report back. I would not make any adjustments to the carb. It ran fine before and probably will again once the carb is cleaned out.
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bigfish_Oh
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Joined: 13 Sep 2009
Location: West Liberty,Oh
Points: 1226
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Posted: 09 May 2010 at 6:56pm |
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I deal with carb problems on everything. I am concluding, bad gas, plastic tanks and plastic 5 gallon racing fuel jugs condensing moisture? I usually have to rebuild 3-4 carbs a year, I've been using the 45 enough all winter it is still good. I wonder if the 13 gallons @ 4.79 of 110 in the camaro is any good after 4 years?
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1941 WC sat for 29 years,started & dynoed 27 h.p.
1957 WD45 Grandpa bought new,factory p.s.,added wfe
1951 WD, factory p.s.
1960 D14 HnMk IV BkHoe 4 sale
2014 HD Tri Glide
2009 GMC CC SLT Dually
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DREAM
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Joined: 06 Jan 2010
Location: Elberton,GA
Points: 1828
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Posted: 09 May 2010 at 9:04pm |
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You most likely have a fuel pump on that one. It may be bolted to the carb or separate. It should have the two fuel lines(if remote-mount) and one vacuum line. Make sure the vacuum line is not clogged. Start the egine and pull the line off the pump. See if you can feel slight suction. It won't be much. If not, you could have a crankcase vent plugged with crud and grass. Should be on the valve covers for OHV, on valve spring cover for L-head engine. Once you check that, you need to go on and clean the carb and the fuel pump well and install a new kit in the fuel pump. May not need one in the carb, it's pretty simple. Pay attention to the check ball in the pump. It may not have one, or it may have up to two. Depends on the model. I have a 16HP twin. I have to rebuild the pump every few years. The diaphams just get weak. Also make sure you clean the air filter and prefilter correctly. You will need to replace that main filter once every other year. More if you have really dusty-sandy yard like I do. Be sure fuel is fresh. Check in gas tank for obstructions, and take tank off if need be. I have had more problems than you can imagine caused by a ladybug getting in the tank. They are the perfect size and shape to cover the fuel outlet in the tank. Seriously, I have worked on over half a dozen mowers for customers and had one of my own that this happenned to. Hope this helps.
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
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Posted: 09 May 2010 at 9:50pm |
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Dream is on to something there. I kinda forgot about these new fangled vacuum operated gas pumps. They have only been around for what 20 or 30 years. LOL I had trouble with the log splitter engine a few years ago, having to choke it more and more every time you ran it. I blew backwards into the tank from the back side of the diaphragm and it ran better for a time. So I pulled the tank and found a black build up on the suction screen. Cleaned it off and it ran fine. I din't find anything in the tank, it was just like you sprayed graphite on the suction screen.
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