There are very few experiences more frustrating than having a motorcycle that won't start, and when this happens, you're going to want to get to the bottom of the issue quickly. This means identifying the root cause of the problem and finding the right solution, so you can start riding again as soon as possible.

Here, we explore common reasons why your motorcycle won't start and the potential fixes to try.

Quick Checklist: What to Check First

Any time your bike won't start, there are some relatively quick things to check first. You'd be surprised at how easy it can be to overlook something obvious. Here, you can find a quick checklist to run through first. If these aren't the cause of your issue, you can then safely move on to more technical checks:

Rider Error

Sometimes, the reason a motorcycle won’t start has nothing to do with faulty parts or mechanical failure. Simple rider-related oversights are surprisingly common, especially if you’re distracted, in a hurry, or returning to the bike after some time away. Before assuming your motorcycle won't start because of a technical issue, it’s worth checking these basics first.

Is the kill switch on?

A good starting point is to check the kill switch and make sure it's in the 'Run' position. The kill switch is easy to overlook, especially if you used it to shut your motorcycle engine off the last time you used it. If you don't routinely use the kill switch in this way, this could be why your motorcycle won't start. Once it's in the 'Run' position, try to start your bike again.

Is the bike in neutral?

Next, you should double-check that you haven't accidentally left the bike in gear. Many motorcycles will only start if they're in neutral, or if the clutch lever is pulled in, in order to avoid lurching. Even if your bike is able to start in gear, you should get into the habit of starting in neutral, as it puts less strain on your bike.

Is the side stand down?

Check the side stand on your bike and ensure it's up. If the side stand is down, it's possible your bike won't start because of a built-in safety feature that prevents ignition when the sensor detects the stand. If your bike has this feature, it's also possible that an issue with the sensor could prevent your bike from starting.

Battery Problems

Any time your motorcycle fails to start, it's worth considering whether the battery could be to blame. Battery issues are the most common cause of startup issues. Your bike relies on the battery to power the ignition system, and there are plenty of things that can go wrong with it:

Weak or dead battery

If a battery is discharged, it will be unable to start your motorcycle. Depending on how weak the battery power is, you may hear a clicking sound or see dim dashboard lights, or you might get no response at all.

You can try to jump-start your motorcycle, or better still, you can use a charger. After charging for a while, try to start the bike again. If this doesn't solve the problem, or if it keeps dying regularly, the battery could be faulty rather than simply discharged. In this case, you're going to need to replace the battery.

Loose or corroded battery terminals

If your motorcycle won't start or if power cuts in and out, it could also be a sign of loose or corroded battery terminals. The resulting poor electrical contact can prevent your bike from getting enough power. You'll need to turn the bike off before checking, then look for either loose connections, rust or coloured powder.

Loose battery terminals can often be solved by simply tightening the connection, but be careful not to over-tighten. If the battery is lightly corroded, you may be able to clean it using baking soda and water. If the corrosion is more severe and has caused physical damage to the battery posts, you'll need a replacement.

Signs your battery needs replacing

Your battery may need to be replaced if:

• You get a clicking noise, but no ignition

• The battery won't hold a charge for long

• The lights on your motorcycle fade quickly after starting

• The battery dies frequently

• You see signs of a damaged or swollen battery

• The battery is old (average lifespan is 3 to 5 years)

It's worth noting that some battery problems, like loose battery terminals, can be caused by excessively hard braking and the resulting vibrations. Read How to Brake Safely on a Motorcycle to optimise your braking technique.

Fuel System Issues

The fuel system is another major cause of starting issues. If your motorcycle won’t start, the problem can range from something simple, like a lack of fuel, to more complex faults such as blockages or a faulty fuel pump. Checking this area should be one of your first steps, even if it’s just to rule it out.

Empty tank or clogged fuel lines

Check to make sure your fuel tank actually has enough fuel. If your problem is an empty tank, the fix is usually as simple as putting fuel in. The exception here is if you suspect there's a fuel leak. In this case, the best thing to do is to contact a professional and seek their advice, as this is a serious safety concern.

If you're experiencing issues like hard starts, loss of acceleration and reduced power, it could be a sign of restricted fuel flow. This can be a more complex issue, as you'll need to identify the location of the blockage. Fuel lines can potentially be unblocked using compressed air, while the carburettor may need to be disassembled and cleaned out.

Old or contaminated fuel

Other possible fuel-related reasons why your motorcycle won't start may include old or contaminated fuel. If fuel is left for too long, it starts to degrade and can become less combustible. Similarly, fuel can become contaminated, with some contaminants either preventing ignition or blocking the flow of the fuel.

Generally, the fix here is as simple as draining the old or contaminated fuel and adding new fuel. You may want to add a fuel stabiliser if you're going to be leaving the fuel for a long time again. In cases where contaminated fuel has impacted the actual flow, you may need to check the petcock and remove any blockages.

Fuel pump or fuel injector problems

Fuel pump and injector issues can either prevent your motorcycle from starting or cause rough idling and power problems. Unusual pump noises or visible signs of a fuel injector leak during a visual inspection often point to this as the cause.

Depending on the fault, the issue may be resolved by cleaning the injectors or replacing the O-rings or fuel pump. For more complex repairs or when confidence is limited, seeking help from a professional is the safest option.

Electrical & Ignition Problems

If your motorcycle won’t start and the issue doesn’t appear to be related to the battery or fuel system, it’s time to look at electrical and ignition problems. Once the obvious checks are ruled out, faults such as damaged wiring or ignition system issues can prevent the engine from starting or cut power to the motorcycle entirely:

Faulty spark plug

The spark plug is a critical part of the ignition system, and a faulty spark plug can keep your motorcycle from firing up. The easiest way to check this is to use an inline spark tester. It's usually easy to reach the spark plug, and you can use the tool yourself, without needing to involve a specialist.

Connect the tool to the spark plug and the ignition wire, and check that the ignition system is delivering the necessary spark. Check the electrodes for signs of wear while you're doing this. You can try to remove the spark plug and clean it, but if it's damaged or severely worn, you may need to replace it.

Bad ignition switch or wiring issue

Wiring issues or a faulty ignition switch can be the reason your motorcycle won’t start. Start by checking the ignition switch for loose connections or worn contacts, then inspect the wiring for signs of damage, fraying, or pinched cables.

A faulty switch may need to be replaced, although some can be repaired. Wiring repairs are possible if you’re confident with soldering and basic electrical work, but professional assistance may be the safer option. In some cases, replacing the wiring loom entirely may be the most reliable solution.

Blown fuses

A blown fuse is another potential cause of motorcycle startup issues. If the main fuse is blown, your bike will have no power at all. If the starter fuse is blown, you might have power, but the motorcycle still won't start.

Locate the fuse box, usually under the seat. Remove a fuse and look through it. You may need to hold it to the light. If it's blown, the wire inside will be broken. You can also test it with a multimeter. Replace a broken fuse with a new one of the same amperage. Never use a fuse with a higher amperage (e.g. replacing a 20A fuse with a 30A).

Starter Motor and Relay Problems

The starter motor and starter relay are also common problem areas and a good place to look if you still haven't found the reason why your motorcycle won't start by this point. There are some indicators that the starter motor or relay is the culprit, but you'll need to listen carefully as you attempt to start your motorcycle:

Faulty starter relay

A faulty starter relay is often detected if you've already checked for battery issues and found no cause for concern there. You may be able to detect the issue through trial and error, but you can also identify this if you hear a single loud click from the right area when you press the start button.

Unfortunately, if your starter relay is faulty, you're going to need to replace it. Take care when you do this, as you'll need to make sure you buy the right type of relay for your bike model.

Worn-out starter motor

A worn-out starter motor can be the reason your motorcycle won’t start, as it may no longer be able to turn the engine over properly. You might also hear a grinding noise or notice a burning smell, both of which point to internal wear. Common problem areas include the brushes, drive gear and electrical connections.

Once confirmed, the fix usually involves replacing the starter motor. Make sure the replacement unit is correctly rated for your motorcycle model.

Air Intake & Engine Problems

Air flow is crucial for starting your motorcycle because oxygen is required for ignition. As a result, starting issues can be caused by compression problems or air filter anomalies. Alternatively, other engine problems may be at the root of the problem. The following are some of the biggest issues to be aware of:

Clogged air filter

If your air filter is clogged, it can stop the engine from receiving enough oxygen to actually ignite the fuel effectively. In addition to difficulties with starting your motorcycle, you may also notice earlier warning signs, such as reduced acceleration, a strong fuel smell, stalling and poor throttle response.

The good news is, the air filter is easy to find and remove. Inspect it for dirt, debris and oil. If the filter is disposable, simply replace it with a new one. If the filter is reusable, follow the manufacturer's guidelines to clean it.

Flooded engine

A flooded engine is another issue to consider. You may be able to identify this as the cause if you notice the engine cranks but won't start, especially if this produces a strong fuel smell. You can usually confirm this issue by checking the spark plugs to see if they are visibly covered in fuel.

To fix this, turn the ignition off and fully open the throttle. If you then crank the engine for around five to 10 seconds, it should clear the fuel. You can repeat this process if necessary.

There are various causes of a flooded engine, but operator error is a big one. For example, keeping the choke on too long or holding the throttle open too much. If you're a novice rider or if you're experiencing frequent issues, our How to Ride a Motorcycle: 12 Tips for Beginners article could help to refine your skills.

Low compression issues

If you hear the engine turning over but it's not firing, it's worth considering low compression issues, which can be caused by damaged cylinder walls or worn piston rings. You can perform a leak-down test to check this, using a leak-down tester tool. This will help you measure how much air escapes.

Compression issues can be a more complex fix than many of the other issues listed and may require professional assistance if your motorcycle won't start. It can be helpful to identify the cause of the compression issue, so if you're feeling confident, check for obvious signs on the piston rings, valves, seals, head gasket, cylinder walls and cylinder head.

Cold Weather Starting Problems

Are you encountering motorcycle starting issues during a period of cold weather? Perhaps the weather itself is to blame. Thankfully, most of the related are temporary and have simple solutions. Nevertheless, it's worth considering whether there's a way to store your bike to prevent these problems in future:

Thick oil in winter

During the colder months, oil can thicken, making it harder to turn the engine over. This is usually a temporary problem and can be solved by moving the bike to a warmer environment or using a trickle charger.

If this doesn't work and your motorcycle won't start, you can drain the oil and replace it with a winter-grade oil with a more appropriate viscosity. Using a winter-grade oil can also prevent this issue from occurring again in future. If you have a garage or similar indoor facility, it may be worth investing in a garage heater.

Using choke correctly

Understanding how to use the choke correctly can solve many of the potential issues associated with cold weather. It adjusts the fuel-to-air ratio and can make ignition easier.

Only use the choke as needed, because it can cause flooding or spark plug issues if it's left engaged for too long. Pull the choke before starting the bike and gradually reduce the choke once it starts, so that the motorcycle runs normally. Learning to use the choke properly is an invaluable tool for various starting issues.

How to Prevent Motorcycle Starting Problems

Some motorcycle starting problems come out of left field, and there's no way to anticipate them. Others, however, are the culmination of bad habits or behaviours that could be corrected. It's always worth thinking about steps you can take to prevent problems in the future, and the following could help to ensure your bike starts reliably:

Regular battery maintenance

Since battery issues are the most common cause of motorcycle starting problems, it makes sense to take preventive action and perform regular battery maintenance. This includes using a trickle charger if you're not going to be using the bike for a while. Check the battery terminals regularly and keep them clean, too.

Try and ensure the battery is kept dry, as this can prevent corrosion and other issues. Avoid storing the bike for extended periods at extreme temperatures. You can monitor the battery's charge using a tool like a multimeter, and you should also check regularly for swelling or evidence of physical battery damage.

Fuel system care

You can help to protect your motorcycle's fuel system by always using high-quality fuel and using a stabiliser if you're going to be storing the bike for long periods. Keeping your bike in a cool, dry place can extend the fuel system's life, while regular physical inspections can help you identify issues early, before they get worse.

Many bikers are also interested in speed. While our Guide to the World's Fastest Motorcycles is a great read, it's worth noting that excessive speed can cause fuel pumps to wear faster and can place added stress on the fuel injectors.

Seasonal storage tips

It's worth taking some basic steps to protect your bike during the different seasons.

For example, in the winter, try to store your bike somewhere cool and dry, when possible. Road salts, temperature swings and condensation are a perfect storm for corrosion, so try to protect against them as much as you can.

During the summer, it's also a good idea to protect your bike from intense direct sunlight. Leaving your bike in extreme heat can reduce your battery's capacity and shorten its lifespan.

When to Seek Professional Help

Sometimes, when your motorcycle won't start, it's a sign of a significant issue that needs to be fixed by a professional. In the following sections, you'll find information on the types of issues that may require professional help to sort and some of the telltale signs that your bike has one of these problems:

Signs of serious electrical faults

If your motorcycle won't start and you identify signs of serious electrical faults, you need to get professional help. Examples of signs to look out for include complete loss of power, red warning lights, clicking or buzzing sounds from electrical components, or physical evidence of damaged or corroded wiring.

Water getting into areas like spark plug wells or electrical connectors can also cause issues related to electrical components. Read How to Ride a Motorcycle in the Rain for advice on how to deal with wet conditions safely. If you think you've experienced water damage, such as from riding through deep water, seek professional assistance.

Engine issues requiring diagnostics

If your issue seems to be related to your motorcycle's engine, but it's not one of the issues mentioned, you may need to seek professional advice. Many engine problems will require advanced diagnostics, using special tools.

Some potential engine issues are also too complex for most people to fix themselves. Examples include a seized engine, oil leaks, and severe physical damage to engine components.

If you're not confident with a fix

Finally, you should speak to a professional any time you're not feeling confident about how to fix a motorcycle yourself. While there are plenty of online resources that can help you to overcome simple issues, more complex fixes can feel daunting, and it's not worth the risk of making a mistake and creating a worse problem.

There's no shame in accepting your own limits and going to a garage or repair shop. Similarly, if you've tried to fix a problem yourself and it hasn't worked, it might be time to go to a professional.

Getting Your Motorcycle Back on the Road

When your motorcycle won’t start, the key is to stay methodical. In many cases, it comes down to simple issues, which you can resolve quickly with the right approach. By working through common causes, you give yourself the best chance of identifying the problem early and avoiding unnecessary repairs. If the issue persists or involves complex electrical or engine faults, seeking professional help is the best way to get your bike back on the road.