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Craftsman lawn tractor with B&S 252707 engine will not run with air filter on but starts and run with it off. What else can I check?

Replaced air filter,fuel filter,also replaced governor spring which broke,cleaned carb. What else can I check?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: craftsman lawn tractor wont start

your fuel filter could be plugged

Posted on Jan 19, 2009

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SOURCE: 10 year old Craftsman Lawn Tractor won't start

I had a similar problem and found that the float was hanging up on the wall of the carb fuel chamber. I sanded lightly the outer edge of the float and never had the problem again. That was 3 years ago. Having a different problem now. After setting overnight in cold weather, 20's, engine turns over very slowly even with a new battery. Engine starts, but barely. Once running, everything seems fine. After shutoff, engine restarts quickly. Next morning, same thing happens. Anyone have any thoughts?

Posted on Dec 28, 2009

mickey813
  • 472 Answers

SOURCE: Tractor starts then shuts off, smell flooded

ck the seat saftey swicth thay go bad

Posted on Feb 21, 2010

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SOURCE: I have a sears lawn tractor with a 25 hp ohv

So have you actually checked spark to both plugs? If so then inspect valves to be sure valves are operating. Sounds like running on one cylinder. A quick check would be to unplug one spark plug at a time. You may find if you remove the dead plugh wire, there is no change. If you unplug the running cylinder it probably won't start. Sometimes the compression release mechanisms can come apart or come loose. Download your manual for you engine model at www.briggsandstratton.com

Posted on Aug 10, 2010

barterjoe
  • 338 Answers

SOURCE: lawn mower starts but makes

I hope this helps you. :
http://www.fixya.com/support/r8367428-starts_dies_common_engine_problem

I would recommend using carburetor cleaner and flush out the jets.
Joe

Posted on Apr 05, 2011

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Craftsman 11Hp lawn tractor / B&S 252707 engine. Will not start/run with air filter on but runs without it.


paper air filter
engine needs more air
should be an air /fuel adjustment on carby

May 01, 2017 | Craftsman Garden

1 Answer

My name is jim. My Sears Craftsman lawn Tractor


Clean the carburetor. The needle and float are stuck closed, passage blocked or a jet plugged with debris. Give it a good cleaning.

Jul 30, 2011 | Craftsman Garden

1 Answer

Tractor wont start


For a small gas engine than won't start, think FAST -- Fuel, Air, Spark, Timing. You've replaced the filters and spark plugs and squirted in some starter fluid, eliminating the simple common fuel, air, and spark problems -- but I because of the backfiring I think your problem is in the timing -- like a sticking valve. Probably more than you want to tackle at home, but might not be as expensive as an engine replacement. Take it to a good small engine mechanic -- best bet is a lawn equipment shop that has been around many years. Drive a little farther to get to one if necessary.

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10 year old Craftsman Lawn Tractor won't start


That's really strange. The low-speed fuel adjustment screw may be set way too rich, but that doesn't seem likely. With the air filter off, look at the choke plate if possible as you advance the throttle and see at what point the choke closes. Back it off till the choke opens and then put the filter back on and try to start it at that setting. Another thing that could cause too much fuel is if the adjustment of the carburetor float is off, causing the fuel level to be too high in the carb bowl.

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does it turn over slow or fast if it turns slowly thats the problem so it could be battery or starter they have to have a good amount of rpms to burn fuel right when starting if not it floods out the engine with gas hope this helps thanks wade

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pull the flywheel and check if the key(latter models the flywheel itself will need replaced if stripped)is damaged. This is a possibility.

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The starter bendix is not engaging properly the bendix pushes the starter gear into the flywheel gear when the starter spools up, it may need minor lubrication.
It sounds like the engine is not getting fuel as it should, the main jet may be restricted from varnish if she stumbles under a load especially if the plug tips are white after running for 1/2 an hour.
Remove the float bowl and clean the jet, make sure the fuel is still good, gas that smells like a library is more like varnish and less like fuel.

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