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I have a21 hp. B&s zero turn mower cleaned carb changes filters plug checked valves no binding on deck cranks runs good but does not have power

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Posted on Jan 02, 2017

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SOURCE: mower backfires and loss of power

i would also check fuel flow. pull the gas line from the carb and see if gas flows out at a good rate (into a metal can of course) or if it trickles out. if the latter, then gas tank either has junk at the bottom preventing the gas from flowing or the vent hole (usually on the gas cap) is plugged.

i have also had my carb float bowl rust out on me, but that took 10 years.

Posted on Jan 29, 2009

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SOURCE: Have a Briggs & Stratton lawn mower engine, 4.5

Is Blade new or causeing vibration .Chge blade,

Please rate Thank you jj505

Posted on Mar 30, 2009

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SOURCE: Mower deck will not engage.

you have sheared off the keyway either on the mandrel or pully on the engine

Posted on Jun 30, 2009

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SOURCE: weedeater will not start. was running, shut it off

Pull the spark plug after pushing the primer bulb and cranking a few times...if the plug is "wet" (indicating fuel is present in the cylinder) then the next step will be checking the compression...compression should read above 90psi (preferrably 100-125psi)...if compression is below 90psi, the most likely culprit will be a stuck piston ring.

Posted on Sep 08, 2009

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SOURCE: Mower wont start.

I have a 927 series rider and just put a new battery,and spark plug.Has spark and still wont start. What else can I try?

Posted on May 30, 2010

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My mower was running fine it started to lose power and run about half throttle now it want run put chock on it run a second then quits

Hi Bobby:
I'd probably tend to give it a maintenance "once over"
- Change plug(s)
- change oil (and filter)
- flush carb (check fuel filter)
- fresh gas
- clean air filter
- clean underside of mower deck
See how it runs and we'll help with any remaining problems.

May 13, 2015 | Garden

1 Answer

Have a Zero Turn mower (50 inch deck), engine will only run with choke full on and bogs down or stalls when demand put on engine ie. mowing in high grass. Changed filters (fuel and air) with no change in...

You have a lean fuel condition. This means your carburetor is clogged. By turning choke on you are changing the air/fuel ratio in the carb. You will need to bring this in to a good repair shop to have the carb cleaned.

Aug 01, 2013 | Garden

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be careful with starting fluids, they strip cylinder walls, NOT a good thing. Prime with WD 40 or gasoline. forget the starter fluids. In all likely hood your carb needs cleaning. Pull the fuel line off the carb first though, and crank the engine. If you get good fuel flow, you just have a plugged fuel filter.

Jul 05, 2013 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

2 Answers

What do I need to troublshoot if my lawn mower want crank after sitting up for awhile

I assume you have checked to make sure you have spark at the plug. Just hold it against any metal surface to make sure you have good spark. Also you may have a carburator that is now gummed up. I would check that out, Also you could spray some start fluid into the carb or filter to see if it starts at all.

Aug 09, 2012 | Poulan 38-Inch Steel Deck 15.5 HP Briggs &...

1 Answer

Fuel keeps coming out of the carb

replace the needle valve in the carb the fuel we get now melts the seal off the valve then change the oil

May 20, 2012 | Toro 42 In Deck 19 Hp Kohler Courage Twin...

1 Answer

I got a poulan po1742stb riding mower with a 17 hp briggs n stratton engine it was my dads and it hadnt cranked since he died which was bout 2 years ago so i had to replace the ignition coil and my wiring...

Thanks for stopping by...
When you said "cleaned the carb" - did you disassemble, and clean - or just spray carb cleaner into it?

Sitting for 2 years - the additives in the gasoline can leave a varnish that will clog the tiny jet orifice in the carb bowl.

You'll need to disassemble, and clean out the jet with a wire.

Popping and sputtering can be caused by a few things:

Old Gas - drain and refill with fresh.
Dirty Air Filter - Check and clean/replace it.
Poor Fuel mix/ratio - clogged Carb Jet or sticky butterfly.
Poor Spark - check/change the plug.
Fuel Vaccuum - remove the gascap - and start... the vent hole may be clogged. Clean and/or replace it if it starts running better with the gas cap off.
Clogged Fuel Filter/inlet screen - backflush the tank and the debris should wash back into the tank. Rinse out and re-install.

This is most likely a fuel delivery or spark issue.

Change the fuel and plug first... and give the carb a GOOD cleaning... then re-check.


Sep 22, 2011 | Poulan 42-Inch Steel Deck 17.5 HP Briggs &...

2 Answers

Had bad fuel, replaced fuel filter, pump and fuel going through pump when cranking. will only run when fuel poured down carb.

hi there

sounds like you have problem in your carb , remove it and clean it out

check jets and air bleeds carefully , check float level , check for tight valves on inlet and exhaust

inlet should be 0.003thou ( inlet valeve is the bottom one and has a alloy push rod ) and exhaust should be 0.005 thou ( exhaust is the top one and has a steel push rod )

just be aware that if the unit is a OHV single briggs motor these engine were prone to blowing head gaskets

some symptoms were , wet / oily inside the air filter, low power , blue/white smoke , running poorly

take a look

cheers hope it helps


Sep 15, 2011 | Craftsman 20 hp 42 in. Deck Lawn Tractor -...

2 Answers

I have a 19 hp kohler courage on my toro zero turn mower. it wont start. i sprayed fuel into carb and it started but as soon as it was burned it died. I checked fuel pump and it was working good. i checked...

This sounds like the carb is plugged. Sometimes fuel thickens and makes globs...

If you verified the fuel flow to the inlet of the carb, then you need to take the carb off and open it up....
So, what needs to happen is you blow out all of the passageways with carb cleaner.

Any adjustable jets: make note of the position it is in, and FINGER TIGHT turn it clockwise until it closes (typically 1 to 1 1/2 turns) SOOOOO, you can set this jet back to the same positon....when finished blowing everything out, bottom the jet and back out the number of turns out, noted for that jet.

Open the float chamber, and clean as necessary, Inspect the float adjustment: invert the carb, and observe the angle of the float, relative to the carb body.... Usually almost parallel, but not necessarily.
Inspect the inlet valve, and clean those areas...

I usually use all new gaskets and valves, but if you are not a carb person, cleaning is effective and I think old gaskets may be okay, if not torn or damaged.

Mar 11, 2011 | Toro 42 In Deck 19 Hp Kohler Courage Twin...

1 Answer

Cleaned gas and changed fuel filter. Mower only

There are a number of things that can cause this, depending on the engine fitted. Assuming a Briggs & Stratton V-twin...

Check that the carb solenoid under the float bowl is connected, has battery voltage when the ignition switch is at 'RUN', and is functional.

As a quick check, with the engne OFF, turn key to 'RUN' there should be an audiable 'click' from the carb if the solenoid is working.

After that, check that the fuel pump is delivering fuel (disconnect output, and crank engine). SHould be a good flow.

Oct 01, 2009 | Craftsman 20 hp 42 in. Deck Lawn Tractor -...

1 Answer

19.5 HP Craftsman Lawn Tractor won't start...any ideas?

Does the motor even turn over. Have you checked the carb. for gunk or gas trash.

May 19, 2009 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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