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Plugged carborator jets

How do I repair/clean plugged carburetor jets on a Briggs and Straton 12 hp.

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Try running a piece of tag wire thru the jet just don't force a bigger wire than the jet size is thru it.the spray carb cleaner thru the jet.then compressed air.no air compressor then take a small piece of hose and try to blow thru the jet.watch for any small "o" rings as you do this if one falls out try to watch where it came from.








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Posted on May 28, 2010

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I have a poulan push lawn mower with a briggs ans straton 4.0 hp. it starts fine but surges up and down. if you mow into higher grass it will sometimes stall. tried oil change, spark plug, emptied all fuel...


Hi
Sounds like you have dirt/debris in your carburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Also check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one.
Also make sure you are using fresh fuel.
If the mower/weedeater is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
Once you have your carburetor rebuilt that should solve your problem.
This is a FREE answer,Please take time to rate me

Jun 07, 2011 | Garden

1 Answer

My briggs and straton 6.75 engine for self proppelled does not want to start. Is the carborator suppose to close when pulling the string or it can stay open. or could you tell what the problem could be. It...


The carburetor would be closed when starting if the automatic choke is functioning right. When you cleaned around the air filter, could some cleaner or debris have gotten into the carb? The line you took off is the crankcase ventilator tube, where crankcase gases are drawn from the lower engine and recycled back into the upper part of the engine to be burned with the fuel; like the PCV line on a car engine. A no start condition can be caused by numerous things. You may have ingested some cleaner/dirt/debris when you cleaned around the air filter area. Remove the air filter again, get some carb/choke cleaner aerosol spray and spray it into the carb with the throttle open. Immediately put the engine in START and try to start it. Try this a few times and you may be able to "coax" it into running and the gas flow may flush out the carb. Another thing to try is drain the old gas, remove the bowl on the carburetor and clean any sediment or water out of it. The brass screw holding the bowl on the carb has to be cleaned too. Use nothing metal to clean it. It has very small holes in it as it is the main jet to the carb. Clean the hole in the bottom and the very small ones in the smooth part 2/3 up the bolt. Try these things. Also make sure your spark plug is cleaned, gapped and sparking correctly. Post back if needed.

Jun 05, 2011 | Garden

1 Answer

I have a briggs and straton 11A-564N711, 6.75hp. Mower runs rough and dies when I start to use it on the grass. I have changed spark plug, oil and air filter. Possibly bad gas? The gas is from last...


Yes, get rid of the bad/old gas then fill with fresh gas and try again. If it does not run properly then you may have to do the following carb rebuild.

Check/Clean/Replace if needed your fuel filter if you have one..
If the mower/weedeater is over a year old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float for the carburetor must be level when you go to reassemble the carburetor or follow the instrucitons you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
This is a FREE answer,Please rate me

Apr 12, 2011 | Garden

1 Answer

Hard to start Earthquake ardisam 6.0 hp ohv briggs and straton intek 206 has been sitting awhile need to clean carborator or what is ohv and plate in front of carborator. need starting instructions


Why not remove the carb. and clean it out? If it was "sitting awhile" the fuel has died and needs to be drained and renewed. You might have to dismantle the carb. and blow out the jets with compressed air. Don`t touch the OHV (over head valve) cover.

Sep 11, 2010 | Ardisam Inc Earthquake Mini Cultivator

1 Answer

Mountfield petrol mower HP470 problem with starting -I've checked plug and petrol both ok. It has a Briggs and Stratton engine. Ideas please. Thank you. '


Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming the carburetor a few times or spraying starting fluid into the carburetor, and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
If the mower/weedeater is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, You will first seat the jet screws and count the number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns they were in/out.
Please do not forget to rate me,
Thanks
Good Luck,
I hope this helped

Aug 01, 2010 | Briggs & Stratton Garden

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