Quick Answer: Why Do I Have To Run My Mower With The Choke On?

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..

How can I make my lawn mower pull easier to start?

If you have the height setting on your lawnmower at a low setting and the grass is already fairly long you will be attempting to start the lawnmower against the friction of the blade turning on the grass. Raise the height setting slightly and it will be easier to pull over the lawnmower engine.

How does choke work on carburetor?

By restricting the flow of air into the throat of the carburetor, the choke valve reduces the pressure inside the throat, which causes a proportionally-greater amount of fuel to be pushed from the main jet into the combustion chamber during cold-running operation.

Why does my motorcycle die when I turn the choke off?

Why a Motorcycle or ATV Only Runs on Choke 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. … So when the choke is turned off, the engine gets too little fuel and too much air for it to run and it stalls.

Why does my chainsaw only run with the choke on?

If your chainsaw only runs with the choke on, it is likely an issue with your carburetor. … If the carburetor is plugged, the engine will be starved of fuel and will not run. However, if the engine is plugged, the choke will pull more fuel through the carburetor’s idle circuit and allow it to run.

What happens when you over prime a lawn mower?

When a lawnmower has been sitting unused, the gasoline gradually drains out of the carburetor, and when the carburetor is dry, the machine won’t start. Most lawnmowers have a priming button that sprays gas into the carburetor, but if you overdo it, you’ll upset the gas/air balance and flood the engine.

How do you activate an automatic choke?

Watch the butterfly valves inside the carburetor while turning the automatic choke element clockwise until the butterfly valves are standing straight up. Turn the choke element counterclockwise until the butterfly valves are fully closed. Tighten the three automatic choke element screws with the screwdriver.

Why does my 2 stroke engine only run on choke?

There are two obvious causes for this to happen. The first, and most common is that the carb is simply dirty. The pilot jet may be gummed up because you have been running dirty gas, old gas, or simply stored the dirt bike with fuel still in the carb.

What happens when choke is pulled?

Therefore when the choke lever pulled the valve opens its lid and air inhaled through this lid. It directly sucks the fuel from bucket due to piston vacuum pressure or venture effect. It feeds this excess fuel to the regular air-fuel mixture flow before the engine intake manifold.

Why does my chainsaw start and then stop?

A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the chainsaw engine to stall.

When should I use choke on my lawn mower?

If the mower is cold, set the choke. The choke helps provide a richer fuel-air mixture to the engine, which helps it stay running until it warms up. Once the mower has been running for a few minutes turn off the choke.

Why does my lawn mower smoke when I first start it?

Your lawn mower’s carburetor regulates the ratio of gasoline to air mixture. If the carburetor isn’t getting enough air, the mixture has a higher percentage of gasoline, which can create black exhaust smoke. It’s possible that a dirty or clogged air filter is preventing sufficient airflow into the carburetor.

Why do I have to choke a warm engine?

In warm weather, a richer mix (more fuel in mix) is simply wastage of fuel as unburnt fuel is simply expelled. If the engine and carburetor are hot, it may happen that putting choke on will prevent ignition (engine won’t start and one can smell petrol in exhaust).

Can you run a pressure washer on choke?

Starting a Gas-Powered Pressure Washer Move the choke to the left (the open position). Move the throttle to the left (the full throttle position). Turn the engine switch to the “ON” position. With the gun assembly still on the holder, pull the engine cord.

Can a carburetor cause a misfire?

A hesitation, stumble or misfire that occurs when the engine is under load can be caused by a faulty power valve inside the carburetor. A carburetor uses intake vacuum to pull fuel through its metering circuits. … If the diaphragm has failed or the valve is clogged with dirt or fuel varnish deposits, it must be replaced.

How long should I let my bike warm up?

Everyone I talked to said about one minute of motorcycle warm-up is plenty of time to allow the piston and other parts to gradually expand and ensure good oil circulation to the upper end. In fact, most riders just start the engine and then spend a minute or two putting on their helmet and preparing to ride.

Does the choke need to be on or off?

The choke is a plate in the carburetor that opens and closes to allow more or less air into the engine. … When doing a cold start, the choke should be closed to limit the amount of air going in. This increases the amount of fuel in the cylinder and helps to keep the engine running, while it is trying to warm up.

What happens if you leave the choke on too long?

Leaving the choke on for too long will cause unnecessary engine wear and waste fuel. … The engine needs its fuel to be vaporised in order to burn it. This is done by the carburettor where the fuel is mixed with clean air coming from the air filter, and sent into the pistons to be ignited.

How long should you leave the choke on?

30 secondsAfter 30 seconds is usually enough for most bikes. Especially a small thumper. Just reduce the choke slowly. If it wont idle smoothly (sounds like an asthmatic pensioner) then it probably wants the choke on a bit longer.

Which position is choke on?

up positionTypically the “choke” is on when the choke lever is in the up position or when the choke lever is inline with the handle bars on your bike. Choke on means that the choke plate is covering the carb throat.

Why does my chainsaw dies when I give it gas?

An engine stalls when it’s getting too much or not enough fuel from the carburetor. Stihl chainsaw carburetors usually have three adjustment screws: one each for idle, low speed and high speed. … If the saw is stalling when you pull the throttle trigger or it doesn’t reach its full power, adjust the high-speed (H) screw.