Why is Yamaha Outboard Electric Choke Not Working?

Why is Yamaha Outboard Electric Choke Not Working?

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Why is Yamaha Outboard Electric Choke Not Working?

The Yamaha Outboard Electric Choke is a device that facilitates the reduction of engine power. You can widely use it in outboard gasoline motors.

The electric Choke works by changing the electrical resistance of the fuel injector, controlling how much fuel can pass through the unit per second, effectively resulting in a gradual increase or decrease in speed.

The motor is not working properly because the electrical connection is not right. You have to change the motor with a new one, or at least the part related to it. Other causes include, battery, wiring problem,malfunctioning switch,throttle cable and vent

They can be explained as follow:

1. Battery

If the battery is old, it won’t be able to start your engine. Ensure you use a new 12-volt battery in your Yamaha Outboard.

2. Motor

The motor is not working properly because the electrical connection is not right. You have to change the motor with a new one, or at least the part related to it.

3. Wiring

The wires you connect in your Yamaha Outboard are damaged or broken and cannot pass current, which is necessary for any movement and operation of any motor.

4. Switch

If there is a problem with the switch itself, you must replace it with a new one or use the correct switch that works perfectly with your Yamaha Outboard.

5. An Electrical Device

Suppose your electrical devices need to be fixed. They can lead to all kinds of malfunctions and bad performance in your engine.

6. Vent

if you don’t clean or repair it, the vent is a safety hazard and won’t let you use your Yamaha Outboard for a long time.

7. Throttle Cable

If there is a problem with the chain of your Yamaha Outboard, your engine won’t be able to move from one place to another. And the air won’t enter it, which is very bad for any movement of your engine and its performance.

How Does the Choke on An Outboard Motor Work?

You can use the Choke to improve the performance of an outboard motor. It does this by choking off the air and fuel mixture before it reaches the combustion chamber.

Doing this creates a higher percentage of fuel in the mixture or choke-throttle setting. This will cause an engine to start and run more smoothly and stop quickly when not in use.

In essence, the Choke is a regulator on the carburetor that vents the air to the atmosphere when it is not needed. This means that when you are not using the motor, you are throttling down (shutting off) the fuel flow to the engine.

You can find the Choke on many outboards, but it has more application in the marine engines used in boats and small vessels.

Boats in salt water absorb more water and oil than their inland counterparts. This results in a deterioration of the usual mechanical parts and wears to bearings that are not designed for sea use.

You can use Choke to keep these motors running smoothly and quietly when not in use. This also helps if you leave the motor running while in storage and forget to turn it off.

The Choke keeps the motor from boiling around water, oil, or condensation that builds up during periods of inactivity. This allows the engine to run under these conditions and not destroy itself.

You should adjust it regularly to keep it running smoothly and quietly. You can adjust the top (most visible) screw on the carburetor.

Why is Yamaha Outboard Electric Choke Not Working?

You can use the vacuum to adjust the Choke, but outboard motors generally have a vacuum reservoir that you can locate under the fuel bowl clamped down with a nut and bolt.

How Do You Start an Electric Choke?

To start an electric choke, do the following:

  • If your engine is running, shut it off as soon as possible without endangering yourself or anyone else in the vicinity.
  • Locate a suitable ground wire for the device under consideration and attach it to a good earth-ground point on your vehicle’s chassis. (You can attach the radio transmitter via the reverse lights fuse)
  • Disconnect all other wires from the starter solenoid before proceeding with this step.
  • Set an ignition timing light (a digital one is most desirable) on a nearby steel surface so that the beam shines through the holes in the starter solenoid.
  • Have a helper jump the leads of the choke device with a screwdriver while you observe the action of your timing light.
  • Observe how quickly or slowly your timing light beam flashes when you “jump” your device leads together at different intervals.
  • Determine how long it takes for your starter solenoid to respond to a “jump” by setting a timing light on the ground and “jumping” the leads of your device with a screwdriver. Then observe the change in your timing light beam’s flashing pattern.
  • Use this information for adjusting the length of your choke device leads, which you can do by cutting the length of each wire or adding more wire to make it longer or shorter as necessary.
  • When your Choke, or starter solenoid, is performing accurately, reconnect all of the wires to the starter solenoid you disconnected before beginning your timing light tests.
  • Allow your engine to idle for a short time before starting again to ensure that the Choke is functioning correctly.

Should The Electric Choke Be Open or Closed?

Closed Electric ChokeOpen Electric Choke
Preventing the spark plug from touching anythingReduces the cost of operation
Prevents high-frequency noise in the spark plugReduces fuel consumption
Prevents the engine from getting too hotMore quickly, technicians can install/remove spark plugs without power tools or pull up the crankshaft pulley.
Prevents damage to the engine.It is up to 30% faster ignition time.
Makes it difficult to remove without using power tools or pulling up on the crankshaft pulley.Improves engine starting because the vacuum is more easily created;

It easier to remove the spark plug without using power tools or pulling up on the crankshaft pulley.
Prevents a spark from jumping the gap between the inner edge of the engine’s crankshaft pulley and the electrode.Allows for greater flow of air/fuel mixture into the combustion chamber;

Creates a complete combustion cycle resulting in improved engines performance, higher engine output, cleaner emissions
Repeatability eliminates voltage variation while activating an external device like a relay;

It allows for a safer starting procedure, even with a low battery.

Do I Need To Pump The Gas With An Electric Choke?

You need to pump the gas with an electric choke because the boat doesn’t have an electric choke system, but if you have been driving for years and it’s okay to stick with what you know, I would say yes because it will work.

A choke requires the engine to stop when there is no fuel pressure. An electric choke requires power to pull open its internal diaphragm, allowing air into the combustion chamber.

AC-powered chargers are also recommended, as they don’t create the same deadly carbon monoxide production as DC chargers.

A carburetor choke is typically a small lever that controls the air intake, while You activate a mechanical choke by modulating the throttle and speed.

An easy and simple way to pump the gas with an electric Choke is to put the Choke on and turn on the boat with the engine off, pick up speed, and look for gas bubbles in the tank.

When you find it turn off the boat, turn it back on a hill, accelerate till you see gas bubbles collecting in the tailpipe, then shut it off again

And buy a manual choke pump to avoid damage to your battery and fuel line. Also, make sure you turn on all accessories, such as lights, etc., when you want to pump your Choke.

Pumping an electric Choke is like pumping gas with an electric choke. You can go to the same place and do it. Well, we can do that anywhere. It’s up to you.

How Do I Cold Start My Yamaha Outboard?

To Cold Start Your Outboard:

  1. Dig a hole in the ground and create a makeshift ramp for your outboard. I use some wood and a large tarp to create my ramp.
  2. Unhook your outboard and pull it as far away from the hole as possible.
  3. Set your outboard on the tarp, cover it with a blanket or down comforter (anything heavier than the outboard), and step on the throttle to start it.
  4. The throttle will resist strongly as the oil circulates into the engine.
  5. Allow the starter to continue for 10-20 seconds until you can hear the engine cranking.
  6. Wait another 5 minutes. You can leave it in place or pull it off to prevent further damage if it does not start.
  7. This is the time to crank it. Once you have pulled it off the tarp, stand over the hole and slowly crank the engine back and forth until it starts.
  8. There may be a foul odor when the engine is cold and will not start. If this happens, crank over the engine until it seems to be clear of any carbon build-up.

How Do I Know If My 2 Strokes Are Blown Up?

Fuel Tank FilterCheck to make sure the filter is clogged and needs replacing.
 If you are unsure, replace the fuel tank filter.
Compression in CarburetorOil level too high or too low in the engine
Ignition System malfunctionCheck for loose spark plug wire connections, faulty cap and rotor, bad spark plug firing order, fouled plugs, or coil pack failure due to shorted components
Engine speed sensor malfunction/broken wiresYour boat could have a faulty speed sensor or broken wires to the sensor(s)
 If your speedometer doesn’t work, check that the cords from your speed sensor are connected to the ECU properly.
 Rough idle/loss of power (excessive RPMs)Exhaust leak – bad gasket, loose pipe, warped header/muffler
 Punctured air filter element – replace the air filter and reassemble the carburetor with new gaskets if needed

How Do You Start a Flooded 2-Stroke Outboard?

To start a flooded 2-stroke outboard, Locate the fuel line near the carburetor, and remove and discard any water in this area.

Inspect the spark plug and make sure it looks clean; if there is oil or water on it, replace it.

Start by removing spark plugs – use a spark plug wrench to make them loose, and then pull them out using your hand. Once the plugs are out, reconnect the fuel line to fill it with fresh gasoline.

Why is Yamaha Outboard Electric Choke Not Working?

Inspect the carburetor and make sure that there are no leaks.

Lubricate the inlet valve of the carburetor with engine oil.

Start the engine by pulling the Choke out and slowly turning it on to prevent flooding your boat or swamping yourself.

Once ready to go, slowly turn off your boat’s radio and turn it off when ready to leave.

In an emergency, steer clear of large bodies of water as they can cause more damage.

Once you clear the area, pull out the Choke, reinsert the plugs and fill up again before leaving.

After filling your boat, go back to where you started this process and inspect your fuel line closely, as you will probably see a small amount of water in it.

Once this is taken care of, you can start enjoying your new boat.

How Often Should You Change A Piston On A 2 -Stroke?

Typically, piston rings only need replacement every 2500 miles under normal use, although a professional mechanic is recommended to replace them at each service regardless.

Some experts suggest replacing the piston and rings every 5000 miles or 12 months of normal use, but this is left to individual preference.

Under normal conditions, you will have to replace a neat-looking set of rings almost certainly once or twice a year, even if you run an automatic transmission or have never used the engine above idle.

The best way of keeping your rings in perfect condition is to change them with each oil change and perform at least one seal replacement per year.

The piston and rings need changing to prevent the hot ring grooves from being scored.

Scoring of groove walls would lead to leakage, which would distort the shape of the ring in the center bore and could cause it to stick in place.

This would lead to loss of compression and might even cause the piston to heat up as the air trapped in the groove leaks out. The ring can also distort if you allow it to rust.

A further reason for changing the drain plug, sometimes called a tap, is that a new tap will be free of any dirt which can accumulate during the previous 5000 miles in service.

The new tap will be perfectly concentric with the bore, leading to less friction than an older one.

Is Turning Over The Same As Cranking?

SpeedAs you crank your engine, you will crank for a certain amount of time,   with less power after that time.  

With more power, your cranking time will be longer. If you don’t have the power, your engine may not start.
Turning your boat over is always a momentary measure. After you turn it over, you will have to write it back up
DirectionTurning the propeller in a boat by using a hand lever or foot pedalTurning the boat on its side to re-position it, then turning it back over.
DurationIt’s a one-time occurrence, after the boat has turned over, it is brought back to its original upright positionCan be a continuous event, for example, when one boat is helping another boat to turn over.
Result-CrankingIf you can crank, the boat will start and move forward with various power levels depending on your engine and how much power it has.When turning your boat over, it will be on land, then upside down.  

After you turn it in the desired direction, you will turn it back up with your hands until you have the desired result.
Resulting Effect-CrankingDepending on how much power the engine has and how fast the boat is going forward depends on what effect this has.When turning your boat over, it will be on land, then upside down.  

Depending on how high up you are, how much power you have, and the kind of engine you have, its effect will be different.  

If the engine breaks while doing this trick, it may not start up again.


The first thing to remember is that a two-stroke engine is a very simple device, so maintenance takes little time and effort.

The most important thing to remember while servicing the carburetor is always to clean it, brush it and oil it after you have finished. This is because these things are vital for adequately functioning the carburetor. 


Hi! I' am Tom. I was a manager in one of the biggest stores for over 10 Years, am also an SEO by night. I don't like to call myself a blogger; they are very analytical, do email marketing, and know all SEO stuff. I faced many questions from customers about different products, and there was hardly any help on the internet. After learning all the things about these products as a manager the hard way, I decided to start a blog and help other people.

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