Why My Motorcycle Sputter On Acceleration?

The summer is here, and everyone who has a ride, is preparing for riding season. Some people take their bikes for quick trips to check that everything works well. The motorcycle may stutter if it is accelerated. What to do if it does?

Today we will solve motorcycle sputtering on acceleration issue to make your ride more enjoyable! There are times when motorcycle speed can be affected negatively due to sputtering. You start at the next gear and push the full throttle; you immediately notice a gradual slowdown. It could occur for many reasons, which we have discussed here in detail.

Motorcycle Sputtering On Acceleration In Fuel Injected Systems

Some of the questions discussed here related to carburetors. New bike models have gasoline injectors rather than carburetors. Fuel injectors are very effective.

Because the air-fuel mixture has different regulations, the chances of you getting a terrible stutter are primarily caused by the fuel pump or the fuel filter. You can investigate by conducting fuel-flow testing to determine what is wrong. You can test fuel flows by examining spherical pressure and fuel pump pressure. 

Checking Your Air Filter

Another simple step would be checking the air filter condition. The bike passes through the filter, which in turn can cause problems therefore check filters for dirt.

Is it worth cleaning your filters? Some filters are too contaminated with oil by the owner or the installer. It can drop airflow or cause too little airflow. If your filters are dry or need to be appropriately oiled, do that first. 

Is Dirt Bike Sputtering At Low RPMs?

During sputtering, when carbs are starved of energy, they can cause problems as they run out of fuel. What drives your power to dwindle at low speeds? These could be pilot jets, also called ‘distance jets’.

To remove the spinning, dismantle the engine and get into the plane. It is smaller than the second jet, and the main jet is larger. Clean the carbs with the respective cleaner and also blow the line or replace them if need be.

Carburetor Issues

The carburetor is a system that mixes fuel and air through the ejector valve into the chambers. When combined with the proper amount of roaring air, the correct fuel is heated, and the resulting vapor becomes more easily ignited in the cylinder chamber.

When the carburetors are dirty, they can’t correctly combust the air in a bike. Vacuum leaks can limit air entering combustion chambers by increasing pressure. When you have fuel problems, your bike will need more fuel.

Dirty Carburetor

A carburetor may become nonfunctioning when it gets covered in dust, dirt, or other debris. The carburetor uses carefully positioned aqueous channels to drive fuel and air into a vacuum. When debris accumulates at valve edges, these valves are susceptible to sticking open and shut.

The energy passes in the fuel tank through holes located in the center of the jets to provide adequate airflow, and then the gases are transferred through. If jets get stuck in the dirt, fuel can’t pass through. You can identify airflow issues by examining the vacuum line on both sides of your motorcycle.

Air/Fuel Adjustment

Carburetors have such delicate bodies that air and fuel mixes can change rapidly. This is accomplished by carefully rotating and adjusting screws on a carburetor body. Adding or decreasing the amount of fuel may occur. You should adjust the screw for fuel consumption.

If running with less liquid fuel, you need the screw changed to put more fuel inside the mix to increase efficiency. During a long ride, the insulators are built up at their tip. This buildup affects the ignition system.

Air Filter

A clogged air filter can often cause your bike to stutter during braking because enough air is not reached. Using the clogged filter can cause stuttering problems. 

Removing clogged air filters can dramatically reduce the noise level on the bike. It is an easy and cheaper alternative. If you have a short distance before replacing the filter, you could blow compressed air around your filter. Compressed air is a temporary solution, so replace your air filters immediately.

Engine Timing Issues

Engine timing problems are often caused by valve timing slipping and have horrible impacts. The bouncing problem is more familiar with V-Twins than any other motor type.

Checking The Carburetor

Some sputter-related problems are a direct result of a carb. I like how the carb was engineered, and it didn’t have much of a problem with it unless something was blocked or contaminated. When the carb is taken out, make sure to check the jets. It is a pair of tiny brass plug holes in the center of the nozzle.

The Air Screw Settings

The air screw has one screw that controls airflow. You will insert the screw, and the screw will turn all over. Then according to the manual settings, wind it to the right turn. Settled in the grounds, you can push the airflow through the screw.

The screw will have 1 – 3/4 turn-in depending upon stock configuration. They must be pulled and checked before turning screws. First, start turning completely. So with the screwdriver on the screw, do the complete turn, then count ‘to 1. Continue with another full turn.

Float And Needle

It increases as carbs refuel. This shuts off the fuel by pressing rubber needles into holes that prevent fuel from passing. The floats on a motorcycle will vary depending on your servicing manual. Also, inspect float needles for damage or removal.

If you’re too rich in fuel, it means too much fuel will pass through. These could typically result in wet spark plugs. If it jams and doesn’t release the fuel, it can cause a lot of traction.

Jet Size

The first step is getting the appropriate jet size for the carb. Unscrew jets, so it is easy to pull off. If you are still looking for them, order the right ones to solve the problem.

Some people modify the jet size for specific requirements and better bike performance. It would be fine if you knew the procedure, but you must remove it because it’s an issue. The service manual specification does it well. It’s possible to try different jet sizes once the problem is fixed.

Blocked Jets

When it’s the right size, you can check it for blockages. Holding jets up to the lamp may prevent obstructions to holes. Make sure that the light is visible from the center of the hole. Apply the same method to check if the illumination is clear. You can use pins from the sewing box to fix the hole and to check if the slow jet causing sputtering during acceleration.

Ignition System Problems

The ignition mechanism produces a spark to burn the gas vapor into the combustion chamber. Without consistent ignition, it stutters during acceleration. It has several components that, if damaged, keep the combustion engine in a tight spot.

Spark Plugs

A spark connector is placed inside a cylinder and generates sparks, causing the timely explosions that ignite the piston. The combustion chamber must have an adequate amount of vaporised gas to generate enough power.

If your spark plug is corroded, breaks, or has a thick buildup at the tip of the insulation plug, it cannot properly ignite. Check the spark plugs if you have a fractured cylinder or faulty spark plug cap. When you use the correct spark plug, gently remove the spark plugs and check the insulator tip carefully.

Ignition Coil

This coil generates the voltage necessary for developing a spark required for combustion. If the ignition coil is not working correctly, spark plugs and wires may fail.

Typical signs of the ignition failure of the coil are stuttering and vibration. When the ignition coil is damaged, you might have an electrical problem. If you have any problems locating your ignition coil, you can get it checked using voltmeters and multimeters measuring ohms.

Spark Plug Wires

The plugs transfer electricity to spark plugs so they can ignite. If your spark plug is broken or damaged, your spark plug cannot supply enough power. It can cause your bike to stutter when you’re riding. After a thorough inspection of the wire may take some repair or replacement. This can be a valuable solution for stuttering.

Check The Fuel System

If your bike starts sputtering and you have fuel issues like not enough fuel, you’ll need to use a carb instead.

Can fuel filter be blocked? It can arise from rust on the tank’s surface or other particles. It may seem simple, but worthwhile checking out and the perfect starting point.

Another way to get the fuel from your petcock fuel valve is by popping out a pipe and putting the fuel into a tank, so the fuel flows out. There should be a container that will carry the fuel.

Frequently Asked Queations

Why does my dirt bike bog down when I give it gas?

Clean filters cause carburetors to clog up, which causes faulty combustion and causes bogging. Cleaning or replacing the filters frequently gives the motor a proper mix for powering the dirtbike.

Why does my motorcycle backfire on acceleration?

Backfiring is an accident that occurs when the motorbike is overheated. Motorcycles are designed with the carburetor providing the correct fuel and air ratios to ensure the bike runs smoothly.

What causes a motorcycle to bog down when accelerating?

Most people find air/fuel mixture ineffective or dirty. When the air filters are dirty, it will cause some problems. Take care of the air filters to check whether the issue is resolved.

Why does my bike jerk when I accelerate?

When speed increases, the engine counterweights throw plates out of position. The vehicle’s clutch will slip before it can get traction.

The Bottom Line

In this guide, we explained the motorcycle sputtering on acceleration and the leading causes, such as carburetor issues, blocked vacuum lines, problems in the fuel system, and many other reasons that result in the sputtering which is the sound from the bike.

Also, we have explained some methods to prevent the motorcycle from sputtering on acceleration.