If your lawn mower only runs with the choke on, check the carburetor. … There are several passages in the carburetor that allow fuel to enter the air stream depending how the throttle is set. The idle circuit, for when the throttle is nearly closed and the engine is idling.
When the engine is cold, it needs slightly more fuel in the fuel/air mixture for it to start, which is what the choke does. … If a motorcycle or ATV only runs with the choke on, it’s because the richer “choke on” mixture is actually closer to the engine’s normal operating fuel mixture than the leaner “choke off” mixture.
Beside this, How do you fix a lawn mower that won’t stay running?
Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn’t work, you might need a new fuel filter.
Likewise, Why does my generator only run on half choke?
That issue is almost always caused by a dirty carb. Usually fixed by running it to break down any varnish, or running with an additive like seafoam.
Also, Why does lawn mower keep stopping?
The most common cause of a mower failing to keep running is a clogged air filter. Take the cover off the air filter compartment and remove the filter to see if it is dirty, or clogged with oil and dust.
Why does my lawn mower sputter then die?
A Mower Has to Breathe A dirty air filter inhibits the flow of air into the carburetor. Clean or replace the air filter to stop the mower from sputtering to a halt. Too much air can also cause problems for the engine. … Replace the cap to solve sputtering and dying.
20 Related Question Answers Found
What causes lawn mower to keep cutting off?
The loss of air flow to the engine caused by too tall or too thick grass or a dirty air filter is often the reason a mower engine stalls. … When you try to mow on overgrown lawn, you end up clogging the air filter and shutting off air to the engine.
How do you fix an automatic choke on a lawn mower?
Is it bad to run mower with choke on?
The choke is intended for starting only. It is not possible to properly regulate the fuel/air mixture with the choke closed or partially closed. Excessive quantities of fuel, provided by the choke, will cause oil dilution, washing of oil film from the cylinder, and carbon deposits in the combustion chamber.
Why does my 2 stroke engine only run on choke?
When you turn the choke on for a carburetor, it is creating a rich condition. … So, when your bike only runs on choke, it is because the “rich” mixture that is being burned is actually closer to the appropriate mixture. Then, when you turn the choke off, it becomes much too lean and will not run.
How does automatic choke work on lawn mower?
The choke system uses a light spring to “set” the choke. Once the engine begins to run some type of vacuum signal or possibly the air flow generated by the cooling fan pushing against a vane and linkage or the engine governor through linkage will release/hold open the choke.
Is it bad to run an engine with the choke on?
Leaving the choke on while operating will result in excessive fuel consumption, irregular engine power performance and eventually may even damage the engine. … Some engines utilize a manual fuel primer bulb to enrich the ratio of fuel in the fuel air mixture for initial engine starting.
Why is my lawn mower chugging?
Problems in the Fuel System Since the hole is so small, it can plug up with dust or dirt during normal mowing operations. Check and clean the vent. Surging is also caused by water that got into the fuel. A mower left in a heavy rain or condensation on a hot summer day can choke the engine.
Why do I have to run my lawn mower with the choke on?
any time you need the choke on for the engine to run you are shutting down the air flow because there is not enough fuel getting to the cyl. for the engine to run properly. there is still some passage inside the carb blocked not letting enough fuel into the cyl.
How does an automatic choke work?
Automatically – An automatic choke uses a metal spring to open and close the choke plate. The spring is wound in a housing and attached to the choke linkage on one end. As the engine warms up, it warms the metal spring. As the spring warms, it expands, rotates, and opens the choke plate.
Should the choke be open or closed?
The choke is only used when starting a cold engine. When doing a cold start, the choke should be closed to limit the amount of air going in. … Once the car has warmed up, if the choke does not open fully, the restriction in air may result in reduced power.
How do I fix my lawn mower from sputtering?
– Remove the cap of the gas tank and look in at the gas. …
– Turn the mower over so the oil case is sitting under the carburetor. …
– Remove the screw holding the air filter cover in place. …
– Check the underside of the unit for caked on grass.
Why does my small engine only run on full choke?
An engine that requires the choking ( partial or full ) after initial engine warm up is an indication that the engine fuel air mixture system is out of adjustment. … Both the manual choke system and the manual primer system engines may experience this similar symptom of running only when the fuel mixture is enriched.
Last Updated: 9 days ago – Co-authors : 15 – Users : 10
