So i have this old LT-12 Snapper Riding Mower. With a 2cyl briggs engine. 12 horsepower, and we cant seem to get it to run without full choke. we played with the air mix screw... not much of a change, we changed the fuel filter.. and checked gas tank for dirt...
im guessing its a fuel problem but i dont know what...
one more thing; when we look inside the gas tank there seem to be bubbles coming to the surface from where the gas like starts. [but no leaking gas]
this seemes really odd but if anyone could help it would be GREATLY appriciated.
THANKS IN ADVANCE.
2007-05-21 14:29:49 · 13 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
a friend of mine rebuilt the carb but we didnt soak it.
2007-05-21 14:47:46 · update #1
you,ll probably have to take the carburetor off and clean it real good ,chances are the jets are stopped up on it,it could be from old gas also,but either way it has to be cleaned out,then it should run ok,good luck with it.
2007-05-21 14:38:04 · answer #1 · answered by dodge man 7 · 0⤊ 1⤋
First off I would check the air filter.
I recommend checking the air filter first because a lot of the time (especially with push/pull type lawn mowers that are low to the ground) they tend to suck in grass and leaves thus clogging the filter. It is always a good idea to change the filter yearly or when ever you change the oil. It is also a good idea to change the spark plug yearly as well.
The carburetor needs a certain velocity of air passing through its narrowest part creating a venturi effect. This venturi effect creates a low pressure on the jet that is in the center of the tube in the middle of the carburetor. The low pressure creates a vacuum that "sucks" the gas from the bowl into the rushing air on into your combustion chamber.
With that being said I would not be suprised if you have one or more of the following:
1. Bad gas. Did you empty the gas out before you stored it away? If not then it might need to be drained and filled with new.
2. Clogged carburetor jet holes. If you have a clogged hole (or holes) then the venturi effect in the carburetor cannot pull in enough gas for the engine to have the proper mixture of air to fuel. When ever you keep it on choke there is a butterfly valve that closes restricting the air flow by a little. This gives more gas to the cylinder so it can fire easier. In your case it makes the air to fuel ratio better (not ideal but better than when choke is off). When you turn choke off it makes the engine run lean whick means it has more air.
I hope this helps. If not then I I hope you learned something because you never know next year you might have some other problem and the knowledge you gained from reading this just might help you out.
2007-05-21 15:13:12 · answer #2 · answered by kylethefarmerguy 1 · 1⤊ 2⤋
Sounds like a carb issue. There is a float, needle and seat, etc. in small engines just like in large engines. There really aren't a lot of people around that work on small engines anymore, but if all else fails, try your local motorcycle shop. They may work on it for you. I just had the carb rebuilt on an ATV for 65 bucks. Hope this helps.
2007-05-21 14:36:20 · answer #3 · answered by papag7222000 3 · 0⤊ 0⤋
the carburator probably needs rebuilt, take it off and soak it in carb cleaner for a day and then reinstall it, make sure if it takes a gasket underneath it that you put a new one on. If it runs ok after doing this you will luck out and not have to rebuild it.
2007-05-21 14:39:06 · answer #4 · answered by mister ss 7 · 0⤊ 0⤋
sounds like you have clogged venturi in the carburator and that you need a full choke to create enough vacuum to suck the gas through. Did you happen to empty the gas tank after last season? If not, you have varnished the carb
2007-05-21 14:34:04 · answer #5 · answered by bobsled 5 · 0⤊ 0⤋
On the bottom of the carburetor, there is a fuel shutoff solenoid that is SUPPOSE to open when the ignition key is turned on.
It's stuck....
1) Remove the hood completely for ease of access to it.
2) Unplug the wire go in to the bottom of it. (to keep it from twisting up as you unscrew it.
3) Unscrew it. DON"T use pliers, or vice grips. They cost about $60 to replace.
4) Push the little tapered steel plunger in and out and spray the snot out of it with carb. cleaner.
Once it moves freely, put it back in, plug the wire back in, and fire up the engine.
ADDED:
Don't pull the carburetor off, it's a waste of time.
ADDED#2
Reset the idle mixture screw 1 and 1/2 turns out.
2007-05-21 14:39:48 · answer #6 · answered by Mr. KnowItAll 7 · 1⤊ 1⤋
Replace the fuel pump. Full choke is drawing what fuel it can from the tank. The bubbles are from the broken diaphragm in the pump.
2007-05-21 14:34:16 · answer #7 · answered by Anonymous · 1⤊ 1⤋
so run it with full to half choke.
its too old to fix.
you mean 2 cycle or 2 cylinder?
if its a 2 cycle its the diaphragm.
2007-05-21 14:42:34 · answer #8 · answered by Anonymous · 0⤊ 0⤋
My suggestion would be the spark plug is dirty. Not enough spark for normal gas but enough if over gassing the combustion chamber.
2016-05-19 04:27:37 · answer #9 · answered by Anonymous · 0⤊ 0⤋
clean the carb there are some idle jets pluged
2007-05-21 14:35:07 · answer #10 · answered by Anonymous · 0⤊ 0⤋