Clean the lawn mower's carburetor, part 1

Is your lawn mower running rough, spit and sputter, and choking? It could be the carburetor. Learn how to check and clean the carburetor. For the complete video, go to

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Added: 5 years
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Author Kenz300 x (1 month)
Old bad gas causes problems. When storing gas or a vehicle it is important
to use it up yearly if you added Stabil or Seafoam to it when you filled
up. It is easier to run the vehicle or a tool out of fuel and put fresh in
yearly than deal with the problems that bad fuel causes. Most small engine
problems are due to gas going bad and not because of ethanol. Small engines
have ALWAYS had problems with stale fuel gumming up the carburetor when
left in for long periods of time.
When a small engine like a lawn mower, leaf blower, chain saw, is being put
up for the winter run it out of fuel before putting it away. In the spring
when filling your gas can for the first time add some Sta-Bil or Seafoam to
the gas to extend its life. Gas generally starts to go bad after 30 -60
days. By adding the fuel stabilizer it will extend its life. 

Author MrGibby26 (1 year)
Great video buddy it really helped me out on fixing my lawn mower thanks
again for your help.

Author Galen Cloughly (11 months)
Great Video
I filled my mower with gas and it all poured out the air filter. Why?

Author angrysquirrel11 (1 year)
Thanks Whizkid again for your help. Looks like I need to take the carb
apart myself and clean that needle valve thing with carb cleaner. I was
moving the choke in and out with a string and it seemed to cut a bit longer
before it stalled. Guess I just need to take this apart and clean it. :O

Author ESRepair . (3 years)
@MrMilitantviper not to my knowledge. Those products are oil based
lubricants and shouldn't be used in the carburetor. those can be used to
lubricate the linkages connecting to the carburetor. there are alternatives
like gumout but WhizKid should be on here later this morning after work.
He'll have a better solution for alternative cleaners.-MrFixit

Author ESRepair . (4 years)
@UberPloxage No, this is a channel WhizKid and I do together. We been best
friends since '92. It was mainly his idea. I thought that it would be great
to try, although I was relunctant to proceed. Nonetheless, I think the
channel is doing better than anticipated. Been wanting to do more videos,
but with our schedules, it tends to make that difficult. WhizKid works with
small engines while I do computers and electronics. I learn his field of
interest and he learns my field of interest. MrFixit

Author Dustin Sfford (4 years)
@killacash you know your country when you work on your washer

Author mario ortiz (2 years)
Every time I start mower I have to prime it.I put a rebuild kit in it and
that did not help.What do you think is the problem?

Author Bill G. (2 years)
My problem is when I try to start my mower it cranks over and all, but then
gas pours from the exhaust pipe. It's a 12.5 HP B&S (28v707-1170-E1) and
the carb looks I think identical to the one in your video. Will cleaning
solve this problem?

Author ESRepair . (3 years)
@pimprock23 Pull the top off of your lawnmower motor and get down to where
you can see the flywheel key . If it's sheared any it will cause the motor
to get out of timeing spark wise and this will cause the spark plug to fire
at the wrong time and cause this problem . Check to make sure that both
values are opening and closing right .Especially, if it's an OHV . Make
sure valve seats and guides are alright . If OHV make sure that valve
clearance are set right . Make sure that carb. is clean .

Author megaman5043 (3 years)
@ESRepair i just looked at the carb n finished the vid i think i know how
to clean it also i noticed there was a screw on the bottom of the bowl
thing ima redo this tomaro n spray the carb cleaner cross ur fingers that
it will work

Author ESRepair . (3 years)
@andy42x You must have an older engine , since most newer engines today
don't have the bowl screw . The screw under the bowl is the fuel adjuster
for the main jet . The more that you open it up the more fuel goes in and
the shorter you adjust it the less fuel goes in . Gad t hear that you got
it going . Whizkid

Author Andrew G. (3 years)
@ESRepair Thanks for the reply! I was messing around with the screw
underneath the bowl, and I turned it a few times, and it seemed to fix the
problem. The mower ran without stalling. Strange.

Author AfternoonPlay (2 years)
Well Whizkid. Looks like your investagative skills are slippin' . . lol. I
am in the Mountains of Mourne on the west coast of Ireland. Thanks for the
info on the carb, I forgot to winterize my five year old honda mower /
mulcher last year and the crankcase was full of gas! The darn thing was
surging last fall and I took the lazy approach of spraying carb cleaner
through the air intake while she was spluttering. Anyway she's up and
running now, flushed the oil twice, once cold then hot. Greg.

Author pimprock23 (3 years)
hi i need help not cleaning it but exaust is blowing out the carb and
making lots of noise but i hear its to rich but i dont even think the
neddle workes and i even checked the valve timing and the spark. please
what can i do

Author megaman5043 (3 years)
what if the carb i haz 4 the lawn mower seems to not hav any screws on it
at all?

Author 7bikerboy7 (4 years)
You gotta stop getting sprayed in the face with that cleaner

Author vlawns (2 years)
Great demo. Cleaned one before and could've used ur vid ahead of time. Good
thing I didn't need to rebuild...

Author billybonewhacker (2 years)
grt vid man.i find a half a cwp full of lucas fuel treatment every month or
so really keeps that stuff clean and lubed

Author ESRepair . (4 years)
@cessna151 THANK YOU ,THANK YOU !!!!!!!

Author DigitalConceptions (1 year)
thanks for this video

Author 666mrjimbo (2 years)

Author Kenneth White (1 year)
dear ESRepair, I am pretty sure my carburetor needs to be cleaned, I have
been troubleshooting my troy bilt mower all week.. after running over an
ant pile hidden by tall grass '-_- was successful in checking the drive
shaft to make sure its not bent, replaced the air filter, and the spark
plug, still wont start. (did all of this after replacing the pull start
rope after breaking it) any recommendations before i pull this carburetor

Author ESRepair . (4 years)
Thank you all for the wonderfull comments . :) Whizkid

Author wanderer1031 (4 years)
i just spray mine off with the water hose and give him some lemonade and
tortillas. never gives me any trouble at all....

Author juan G (4 years)

Author ESRepair . (2 years)
AfternoonPlay, Thank you for the compliment. We are doing fine around here
, how are you . We are glad that our videos are appreciated here , but
where exactly is here ???? Thaks, Whizkid

Author Dustin Sfford (4 years)
@ESRepair Wait so thats not you?

Author ESRepair . (2 years)
Theres always work involved in fixing something . If the mower is in good
shape and well taken care of and the price is reasonable , then it might be
worth buying . Also depends on the type of carb , motor and whatevers wrong
with the carb . ,also depends on your mechanical skills . Whizkid

Author ESRepair . (1 year)
Angrysquirrel11, Yes, I'd say that you can clean the carb with compressed
air can and a paperclip. I've never done it that way . The only thing is
that the paper clip might be to big for some of the holes and the
compressed air can may not have enough pressure to blow out the holes as
well as a real air compressor. But, it's worth a try . Whizkid

Author ESRepair . (3 years)
@tc5i Everyone starts from scratch then learn as they go. Carburaters are
different from one model to the next, so if you have any questions please
ask. We'll be glad to help. -MrFixit.

Author pimprock23 (3 years)
@ESRepair thanks for the tips but it turns out i make a custum exuast
muffler and there was to much back Pressure

Author ESRepair . (4 years)
@cessna151 LOL -MrFixit

Author countyguy2003 (2 years)
thanks ill try that i soaked it in vineager for a night but ill try that

Author ESRepair . (2 years)
Thank you vlawns, Wish we could have helped you earlier ,but rebuilds
aren't bad to do , depending on your carb that is .. Whizkid

Author ESRepair . (2 years)
666mrjimbo, Thank you for your lovely comment . I appreciate you taking the
time to send it . Please keep the great comments comming !!! Whizkid

Author ESRepair . (2 years)
666mrjimbo, Again your so right . so right that you blind me with your
brilliance . Whizkid

Author angrysquirrel11 (1 year)
Can I use a paperclip to stick through the holes? Also, can I get a can of
compressed air to blow out the holes if I don't have an air compressor?

Author ESRepair . (2 years)
It could also have a stopped up air filter . since the mower is new, it's
not likely ,but it couldhave happened . I've seen them look good and still
be stopped up . Try running it with the air filter out and see what it does
. Also ,the carb could need adjusting . If I can be of service again please
let me know and send me the model numbers off of the lawnmower and the
motor itself and I will look them up. Thank you , Whizkid

Author countyguy2003 (2 years)
i cleaned a carb on a 5 horse briggs that quit running on me did everything
he did on the video the float moves up and down freely the gas is clean it
fills the bowl but it wont pick it from the bowl up to the motor ive had it
appart 5 times tryn to finde the problem with a new carb kit and it still
wont run its a waldoboro carb any ideas?

Author ESRepair . (1 year)
John , It's just you because I would never put shit in my mouth . Whizkid

Author AfternoonPlay (2 years)
Gosh, I must be getting old. . . East coast of Ireland. lol.

Author Tacy Lee Barney (3 years)
I started my lawnmower and it immediately started blowing motor oil out of
what looks like a breather tube until that time I was doing all the basic
repairs and it operated just fine for years I need some suggestions on why
this is happening

Author tc5i (3 years)
Good overview for me who is going to do this for the first time. I haven't
opened it yet but now know what to expect now. Thanks

Author angrysquirrel11 (1 year)
Thanks for your help! The carb was leaking gas out the air filter yesterday
and it wouldn't restart. But I took the filter off last night and sat the
mower outside. Luckily this morning I was able to start it again. I think
that I need to turn the rpms up on it but I don't know how to do it. Grr.

Author Ian Asher (2 years)
@countyguy2003 clean out the screw that holds the float bowl to the rest of
the carb, I've cleaned three different carbs now and that was the screw
that was always the problem

Author ESRepair . (2 years)
anddihier, Sounds to me like trash could have been sucked into the carb.
and stopped it up so that it is running either rich ( more gas than air )
or lean ( more air than gas ) . In order to fix it you need to take the
carb off and clean it as I demostrated in another video . That carb. may be
different from your carb but the technique is the same mostly . Is it a
riding mower or a pushmower ? The gas could have gone bad setting . you can
buy a bottle of the stuff that's supposed to make

Author ESRepair . (3 years)
@andy42x Andy , If you have the carb. already off and apart it would be
wise to go ahead and clean the whole carb. The bowl needs to be cleaned ,
but it is just a bowl all of the main parts are in the carb. body . If the
bowl needs cl;eaning then chances are the whole carb. needs to be cleaned .
Better safe than sorry since you already have the carb. off to clean the
whole thing . It sounds like it needs the works if running only primmed.
Yes , it is a full carb . cleaning , Whizkid

Author ESRepair . (1 year)
Angrysquirrel11, Anytime there's gas leaking out the air filter that means
the needle valve is stuck open from trash or what ever .Never turn up the
governor if you don't know how as you can blow up an engine fast . Turning
the rpms up has nothing to do with it leaking the gas . Whizkid

Author Anddi (2 years)
Mine ran outta gas, put new gas in and now idles poorly with black smoke
coming out. It sat 2 mths since we've had a bad drought this summer...could
it be the gas got glue like from that or would bad gas make it smoke like
that? Not sure whats wrong, cleaned the filter it was spotless...I've only
used the mower like 4 times, bought new this spring so didnt think oil or
plugs could be bad already...please help ---single mom trying to get the
grass cut and need this mower to run...:)

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