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Engine starts but little reaction from choke lever,with engine warm moving lever to choke position slows revs to very slow/stop. Carb removed ot clean,may have gaskets wrongly set.

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What is the make and model of the mower?

Posted on Mar 04, 2009

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Hi Every 2 stoke engine needs three things to run:Fuel+oil/air mixture in correct proportions,compression and ignition.Remove the sparkplug and see if the spark appears when the piston in the cilinder is at top death point(almoust),if not check the flyweel key(not to be sheared).Check engine"s sealing(crankcase gasket,cilinder gasket,seals-crankshaft,carb gasket).Also the mufller(not to be clogged),disassemble the carb (check and clean it),fuel lines and fuel filter (check and clean them),gas cap tank vent(not to be clogged),the air filter.Please let me know

Posted on Mar 04, 2009

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The choke cable is out of adjustment.
Move the lever by hand.
With the engine warm - you should have the choke OFF.
Have you changed the sparkplug & or made sure it is properly gapped?

Posted on Mar 04, 2009

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1 Answer

Briggs Stratton 5hp I/C starts ok, runs, but will not rev


My money is on a partial blockage of the main jet or the passageway to it. You're having to force it to run through the idle jet by fully choking the incoming air. There's not enough gas coming in with the choke open to allow it to run.

I'm thiniking total carb disassembly, carb cleaner and an air compressor combined with a ton of patience will take care of the issue.

Mar 31, 2015 | Briggs & Stratton Briggs Stratton...

1 Answer

Automatic choke will not shut off once the engine is running so engine dies. Could it be a spring is missing ?


There is a diaphram that the link connects to the choke. It is between the carb and the gas tank, and runs by the vacuum from the engine. B&S engines have to rev up for the choke to open all the way.

Sep 20, 2014 | Cub Cadet Lawn Mowers

1 Answer

Craftsman riding mower dies after it gets warmed up


Check the choke. Typically these are automatic types on most new mowers. The choke is closed during cold starts then automatically open as the engine warms (think of it like a car that fast-idles in the winter, then slows down as it warms...it's not exactly the same thing, but in theory works on the same principle).
What could be happening with your problem is that the choke is stuck closed or partially closed, and remains closed after the engine warms. When the choke is closed when the engine is warm, it floods the engine with fuel and stalls (and can be difficult to restart, if you can get it to restart).


To test if this is your issue, operate it until it's warm and quits. Remove the air filter and check that the butterfly valve at the top of the carburetor is open. If it's closed, open it all the way (might have to put a screwdriver, or something in there to hold it open), then try to restart it. If it's open all the way, there is likely a fuel flow restriction to the carb, or in the carb, but these problems typically cause problems running the engine hot or cold.

Two recommendations.
1. Remove carburetor, and clean with spray carb cleaner. The choke is the butterfly valve visible where the air filter attaches. Check the linkage for debris, bent or restricted linkage. After cleaning and re installation, check for free movement of butterfly choke valve.
2. Prevention. There is not a lot that can be done, but to clean the carb/choke and throttle linkage during spring tune up before first use. May require more cleaning depending on amount of use. ALWAYS USE 100% GAS, NO ETHANOL. If you must use ethanol because 100% gas in unavailable, always mix with an additive that neutralizes the effect of the ethanol. Infrequently used engines (unlike cars) that use ethanol are prone to problems because the fuel system retains water. Carburetors do not like water, cause corrosion, and repairs can be costly. For example, Someone just gave me a nice (fairly new) Bolens Riding Mower (38" B&S engine - worth about $800 ) that would not run, they just got tired of it not running right and the cost of repair shop work was about $200. I bought a $65 carb on Amazon and now I've got a nice new riding mower. They saved $.50/gal on gas and I saved $740 on a new mower...yeah, baby!

Sep 02, 2013 | Craftsman Lawn Mowers

1 Answer

Model lv195ea


There is not a governor on newer mowers. Ease mower thru grass slowly, if starts to slow down stop, let mower speed up. In tall grass only use 1/2 of the deck width with side discharge open. Ensure spark plug is clean and gapped properly, replace once a year. Ensure air filter is clean, replace once a year. Ensure oil is full. 30w oil. Always use Stabile in gas. Use carb cleaner and clean outside of carb to ensure choke lever is free to rotate.

May 09, 2013 | Toro Lawn Mowers

1 Answer

Poulan pro honda engine stalls as auto choke lever moves


Hi, when you say you cleaned the carb, did you strip it down and blow all the jets out with compressed air? If so, check that you have fuel flowing into the carb. If all this is ok check the valve clearances. Regards Phil.

Jun 24, 2012 | Poulan Lawn Mowers

1 Answer

Honda hra 215 sxc mower- choke lever will not go far enough to get engine started - must be pushed manually - how to fix?


There should be a hex head screw holding the choke cable in place. Loosen the screw a little an move the choke all the way closed and pull lever on choke to the closed choke position and tighten the screw back. Just make sure it is not pulled so tight that the choke will not open back up. Hope this helps you.

Jun 11, 2012 | Lawn Mowers

3 Answers

I have A Scott Bonner lawn mower ,high performance,overhead cam, SX 4000, 4 stroke.I am finding it very difficult to start the cold mower every time I go to mow the lawn.It takes me about half an hour of...


Hi and welcome to FixYa, I am Kelly.

The symptoms you describe are typical of debris in the fuel bowl of the carb. I am going to assume for the moment that it is a similar to a Briggs and Stratton engine. Engine model type and serial information is what we work with to resolve engine problems regardless of the mower brand. I note you said it was a Scott Bonner SX4000 engine. I am also assuming that you have the 18 inch GreenKeeper like this one:
http://www.rovermowers.co.nz/www/rover/Home.nsf/13a851504c93cb754a257821000cfc6b/$FILE/28045.pdf

I do not have access to Scott Bonner Engine parts or technical data but if you clean out the fuel float bowl and it is still hard to start then the choke function of the engine is not working. Your engine has a "Bowl drain" screw on the bottom of the carb float bowl for removing carb debris or water in addition to a bowl nut.

Most likely due to the throttle cable needing and adjustment so that the choke is closed when choke is selected. Adjustment of the throttle cable is as simple as losening the clamp screw (Do NOT remove it) on the side of the carb throttle control and moving the throttle to STOP then re-tightening the clamp retaining screw. This should allow your choke to move full closed when selected. You may have to experiment with full throttle and STOP throttle control positions with the clamp screw loose but not removed to see which position will give you full throttle, choke and STOP. After each adjustment you MUST tighten the clamp screw to test the throttle cable travel on the the throttle plate. Beleive it or not... the person that assemble the mower made the intial throttle adjustment. It may have never been tested before you got the mower.

If you still have problems.... this is the brief way to start an engine that has choke problems. Remove the spark plug and squirt a splash of gas into the spark plug hole and then re-install the spark plug. Just don't over-do the splash of gas and if your messy wipe off the excess so you do not start a fire. (This method always works but you occasionally foul a spark plug with too much gas)

Thanks for choosing FixYa,
Kelly

Feb 01, 2011 | Lawn Mowers

1 Answer

My throttle position markings have worn off. Is start position to the front or rear? It cranks in both but quickly dies.


Usually if you push the lever forward that is the start position (or choke position) once started in this position from cold start, slide back this should be fast, slide a little further back and this should be slow then all the back should stop. Have not worked on a lawn boy silver for about two years now but all are about the same, anyhow give that a go, good luck!

Oct 22, 2009 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

I cannot start my Suffolk punch 43s petrol mower, can anyone tell me how the choke should be set?Or where can I download a free instruction manual.


As far as I can tell, there are no downloads available. I eventually gave up and bought a copy from a mower museum. You will need to know the approximate age, as several diferrent engines have been fitted.

If you have the old red engine, the choke lever should be at right angles to the line of the carb IE pointing straight back.

The newer green engines are usually marked, but of not, remove the air filter and look into the carb throat. When the choke flap is CLOSED, the choke is ON IE cold start position.

As soon as the engie starts, move the choke to approx 50%, then fully open after 30 seconds or so.

If in good order, these engines are a 1-pull start. Fit a new plug, then spray WD-40 or similar into the OPEN carb thoat. If there is no sign of life at all, you have a coil failure (or possibly a points problem if it's ancient).

Sep 18, 2009 | Lawn Mowers

1 Answer

The engine starts but when you exclude the choke it will stop


is this a tecumseh engine we are talking about?
there are a couple things you can try, they involve removing the carb again, some carbs have two butterfly valves one at the front for the choke, and the other toward the motor being the throttle valve, with the carb off look into the end with the throttle valve and check for 3 tiny holes next to the throttle valve, ckean these with a bread tie , you will have to look real hard to see them. those are your idle jets they are arranged so that one will be behind the throttle plate when it is in the closed position and two staggered toward the engine intake side on what would be the side that mounts to the motor. clean these and reasseemble the carb and put it back on, and see if that cures the erratic idle.

Apr 08, 2009 | Lawn Mowers

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