Bike Won't Start: 20 Possible Reasons With Fixes

You’ve tried everything you can think of, but you still can’t get your bike to start, right? It is possible for it to be really bothersome. If you don’t want to run into problems again, you can’t afford to overlook any of these 20 potential causes with the solutions.

If your dirt bike is not starting, there can be many reasons for this issue. A dead or weak battery, fuel problems, spark plug problems, ignition problems, air filter problems, engine problems, starter motor or solenoid problems, kickstarter mechanism problems, stale fuel, incorrect fuel mixture (for two-stroke engines), electrical problems, clutch problems, carburetor flooding, choke not engaged, damaged or worn out spark plug wire, fuel line problems, overheated engine, clogged exhaust system, faulty kill switch, and faulty fuel pump (for fuel-injected dirt bikes) are some of the common reasons why a dirt bike may not start.

To diagnose the issue, it’s important to perform a thorough inspection of the dirt bike, including the battery, fuel system, spark plug, ignition system, air filter, and engine components.

20 Most Common Reasons Why Your Dirt Bike Won’t Start?

Here is a comprehensive list of reasons why a dirt bike may not start:

Dead or weak battery
Fuel problems (e.g. low fuel, clogged fuel filter, dirty carburetor)
Spark plug problems (e.g. fouled or damaged spark plug)
Ignition problems (e.g. faulty ignition switch, wiring, or connections)
Air filter problems (e.g. dirty or clogged air filter)
Engine problems (e.g. low compression, seized engine, worn out piston rings)
Faulty starter motor or solenoid
Faulty kickstarter mechanism
Stale fuel
Incorrect fuel mixture (for two-stroke engines)
Electrical problems (e.g. faulty connections, damaged wiring)
Clutch problems (e.g. worn out clutch, damaged clutch cable)
Carburetor flooding (e.g. due to leaving fuel valve open)
Choke not engaged (if the engine is cold)
Damaged or worn out spark plug wire
Fuel line problems (e.g. blocked or kinked fuel line)
Overheated engine (e.g. due to prolonged idling or hard riding)
Clogged exhaust system (e.g. due to buildup of carbon or debris)
Faulty kill switch
Faulty fuel pump (for fuel-injected dirt bikes)

1. Dead or weak battery

A dead or weak battery can prevent your dirt bike from starting. Here are some signs that your battery may be dead or weak:

When you try to start your dirt bike, the engine doesn’t turn over, or it turns over very slowly.
The lights and other electrical components on your dirt bike are dim or don’t turn on at all.
You have to jump start your dirt bike in order to get it to start.
The battery has been sitting for a long time without being used or charged.

To troubleshoot a dead or weak battery, you can try the following:

Check the battery terminals for corrosion or loose connections, and clean and tighten them if necessary.
Use a multimeter to check the battery voltage. A fully charged battery should read around 12.6 volts. If the voltage is significantly lower than this, the battery may be dead or weak.
Try jump starting the dirt bike with a car or another bike. If it starts, the battery is likely the problem.
Charge the battery with a battery charger. If it holds a charge and the bike starts after charging, the battery may be weak but still usable. If it doesn’t hold a charge, it may need to be replaced.
If the battery is dead or weak and cannot be recharged, it will need to be replaced. It’s important to use the correct type of battery for your dirt bike, and to properly maintain it by keeping it charged and stored in a dry, cool place when not in use.

2. Fuel problems

Fuel problems are a common cause of a dirt bike not starting. Here are some possible fuel-related issues that could be preventing your dirt bike from starting:

Low fuel level: If the fuel level in the tank is too low, the fuel pump may not be able to draw fuel into the engine, preventing the bike from starting.

Clogged fuel filter: A clogged fuel filter can restrict the flow of fuel to the engine, causing it to run poorly or not start at all.

Dirty carburetor: Dirt, debris, and old fuel can accumulate in the carburetor, blocking the fuel jets and passages and preventing fuel from reaching the engine.

Stale fuel: If the fuel in the tank has been sitting for a long time, it may become stale and lose its effectiveness. This can cause the engine to run poorly or not start at all.

Incorrect fuel mixture: If your dirt bike uses a two-stroke engine, an incorrect fuel mixture can cause starting problems. A mixture that is too rich or too lean can cause the engine to flood or run poorly.

To troubleshoot fuel-related problems, you can try the following:

Check the fuel level in the tank and make sure it’s sufficient.
Check the fuel filter for clogs and replace it if necessary.
Clean the carburetor and fuel system components, including the fuel lines and fuel tank.
Drain and replace the fuel in the tank if it’s stale or contaminated.
Check that the fuel mixture is correct (for two-stroke engines) and adjust it if necessary.

It’s important to properly maintain your dirt bike’s fuel system by using clean, fresh fuel, replacing the fuel filter regularly, and cleaning the carburetor as needed.

3. Spark plug problems

Spark plug problems can also prevent a dirt bike from starting. Here are some possible spark plug-related issues that could be causing your dirt bike not to start:

Fouled spark plug: If the spark plug is fouled with carbon or oil deposits, it may not be able to ignite the fuel mixture in the engine, causing starting problems.

Damaged spark plug: A damaged or worn spark plug may not be able to create a strong enough spark to ignite the fuel mixture, causing the engine to misfire or not start at all.

Incorrect spark plug gap: If the gap between the center and ground electrodes of the spark plug is too small or too large, it may not be able to create a strong enough spark to ignite the fuel mixture.

Improperly installed spark plug: If the spark plug is not tightened to the correct torque specification, it may not be able to create a strong enough spark to ignite the fuel mixture.

To troubleshoot spark plug problems, you can try the following:

Remove the spark plug and inspect it for signs of fouling or damage. Clean or replace the spark plug as necessary.
Check the spark plug gap with a feeler gauge and adjust it if necessary.
Install the spark plug to the correct torque specification using a torque wrench.
Check the spark plug wire for damage or wear, and replace it if necessary.

It’s important to use the correct type of spark plug for your dirt bike, and to replace the spark plug at the recommended intervals specified by the manufacturer.

Proper spark plug maintenance can help ensure reliable starting and optimal engine performance.

4. Ignition problems

Ignition problems can also be a cause of a dirt bike not starting. Here are some possible ignition-related issues that could be preventing your dirt bike from starting:

Faulty ignition coil: The ignition coil is responsible for converting the battery’s low voltage into the high voltage needed to create a spark in the spark plug. A faulty ignition coil can cause weak or no spark, preventing the engine from starting.

Bad spark plug wire: The spark plug wire carries the high voltage from the ignition coil to the spark plug. A damaged or worn spark plug wire can cause weak or no spark, preventing the engine from starting.

Failed CDI unit: The CDI (Capacitor Discharge Ignition) unit is responsible for generating the spark that ignites the fuel mixture in the engine. A failed CDI unit can prevent the spark from occurring, preventing the engine from starting.

Faulty ignition switch: The ignition switch is responsible for controlling the flow of electricity from the battery to the ignition system. A faulty ignition switch can prevent the flow of electricity, preventing the engine from starting.

To troubleshoot ignition problems, you can try the following:

Check the ignition coil, spark plug wire, and CDI unit for signs of damage or wear, and replace them if necessary.
Check the battery voltage with a multimeter, and replace the battery if it’s weak or dead.
Check the connections between the ignition components and the battery, and clean and tighten them if necessary.
Check the ignition switch for proper function, and replace it if necessary.

If you’re unsure how to troubleshoot or repair ignition problems, it’s best to take your dirt bike to a mechanic for professional assistance. Proper ignition system maintenance can help ensure reliable starting and optimal engine performance.

5. Air filter problems

Air filter problems can also cause a dirt bike to have starting issues. Here are some possible air filter-related issues that could be preventing your dirt bike from starting:

Clogged air filter: If the air filter is clogged with dirt, dust, or debris, it can restrict the flow of air to the engine, causing starting problems. The engine needs a certain amount of air to mix with the fuel to create combustion.

Dirty air filter: If the air filter is dirty, but not completely clogged, it may still allow some air to pass through to the engine. However, the dirt and debris on the filter can reduce the quality of the air, which can result in starting problems.

To troubleshoot air filter problems, you can try the following:

Remove the air filter and inspect it for signs of clogging or dirt buildup. If it’s clogged, clean it with compressed air or replace it if it’s too dirty.
Check the air filter box and the air intake tubes for signs of dirt, debris, or blockages. Clean them out as necessary.
Make sure the air filter is properly seated in the air filter box, and that the air filter box is securely fastened to the carburetor or throttle body.
Proper air filter maintenance can help ensure reliable starting and optimal engine performance. It’s important to clean or replace the air filter at the recommended intervals specified by the manufacturer.

6. Engine problems

If none of the above difficulties are preventing your dirt bike from starting, engine faults may be to blame.

Your dirt bike may not start due to engine issues:

Low compression: If the engine has low compression, it may not be able to create enough pressure to ignite the fuel mixture, causing starting problems. Low compression can be caused by worn piston rings, cylinder walls, or valves.

Timing issues: If the timing of the engine is off, the spark may not occur at the right time, preventing the engine from starting. Timing issues can be caused by a malfunctioning timing chain or belt, or a worn camshaft or crankshaft.

Fuel system problems: If the fuel system is not delivering the right amount of fuel to the engine, it may not be able to create combustion, causing starting problems. Fuel system problems can be caused by a clogged fuel filter, a malfunctioning fuel pump, or a dirty or worn carburetor or fuel injector.

Overheating: If the engine is overheating, it may not be able to start due to excessive heat build-up. Overheating can be caused by a malfunctioning cooling system, a clogged radiator, or a worn water pump.

Try these engine troubleshooting methods:

Perform a compression test to check for low compression. If the compression is low, you may need to have the engine rebuilt or replaced.

Check the timing of the engine using a timing light, and adjust it if necessary.
Check the fuel system components, such as the fuel filter, fuel pump, carburetor, and fuel injector, for signs of wear or damage, and replace them if necessary.
Check the cooling system components, such as the radiator, water pump, and thermostat, for signs of wear or damage, and replace them if necessary.

7. Faulty starter motor or solenoid

A faulty starter motor or solenoid can also cause starting issues with a dirt bike. Here’s how each component can cause starting problems:

Faulty starter motor: The starter motor is responsible for turning the engine over when you push the starter button. If the starter motor is faulty, it may not be able to turn the engine over, preventing the engine from starting.

Faulty solenoid: The solenoid is responsible for transmitting power from the battery to the starter motor when you push the starter button. If the solenoid is faulty, it may not be able to send power to the starter motor, preventing the engine from starting.

To troubleshoot starter motor or solenoid problems, you can try the following:

Check the battery voltage with a voltmeter. If the battery voltage is low, try charging or replacing the battery.
Check the starter motor connections to ensure they are clean and secure.
Try tapping on the starter motor with a hammer while trying to start the bike. If the engine starts, it’s a sign that the starter motor is faulty and needs to be replaced.
Check the solenoid connections to ensure they are clean and secure.
Try bypassing the solenoid by connecting the positive and negative battery cables directly to the starter motor. If the engine starts, it’s a sign that the solenoid is faulty and needs to be replaced.

8. Faulty kickstarter mechanism

A faulty kickstarter mechanism can also cause starting issues with a dirt bike. The kickstarter mechanism is responsible for manually turning the engine over to start it. Here’s how a faulty kickstarter mechanism can cause starting problems:

Broken or worn kickstarter gear: The kickstarter gear is responsible for turning the engine over when you kick the kick-starter lever. If the gear is broken or worn, it may not be able to turn the engine over, preventing the engine from starting.

Broken or worn kickstarter shaft: The kickstarter shaft is responsible for transmitting the force from the kickstarter lever to the kickstarter gear. If the shaft is broken or worn, it may not be able to transmit enough force to turn the engine over, preventing the engine from starting.

To troubleshoot kickstarter mechanism problems, you can try the following:

Inspect the kickstarter gear and shaft for signs of wear or damage. If either part is worn or broken, they will need to be replaced.
Check the kickstarter lever and spring to ensure they are functioning properly.
Try kicking the kickstarter lever with more force. If the engine starts, it’s a sign that the kickstarter gear or shaft is worn and needs to be replaced.

9. Stale fuel

Stale fuel can also cause starting issues with a dirt bike. When fuel sits in a tank for an extended period, it can break down and lose its effectiveness. Here’s how stale fuel can cause starting problems:

Clogged fuel system: Stale fuel can cause debris and sediment to accumulate in the fuel system, leading to clogs that prevent fuel from reaching the engine.

Reduced fuel quality: Stale fuel can lose its ability to ignite properly, making it difficult for the engine to start.

To troubleshoot stale fuel problems, you can try the following:

Drain the fuel tank and refill it with fresh fuel.
Check the fuel filter and fuel lines for clogs and debris. Clean or replace them as needed.
Check the carburetor for clogs or dirt buildup. Clean or rebuild the carburetor as needed.
Check the spark plug for fouling or damage. Replace the spark plug if necessary.

Additionally, it’s a good idea to use fuel stabilizer if you plan on storing your dirt bike for an extended period to prevent fuel from going stale.

10. Incorrect fuel mixture (for two-stroke engines)

Incorrect fuel mixture can cause starting issues with two-stroke dirt bikes. Two-stroke engines require a specific fuel-to-oil ratio for optimal performance, and an incorrect mixture can cause starting problems. Here’s how incorrect fuel mixture can cause starting problems:

Poor lubrication: A fuel mixture with too little oil can cause poor lubrication, leading to engine damage that prevents the engine from starting.

Fouled spark plug: An incorrect fuel mixture can cause the spark plug to foul, preventing the engine from starting.

Carbon buildup: An incorrect fuel mixture can cause carbon buildup in the engine, leading to poor engine performance that prevents the engine from starting.

To troubleshoot fuel mixture problems, you can try the following:

Drain the fuel tank and refill it with fresh fuel mixed at the correct fuel-to-oil ratio.
Check the spark plug for fouling or damage. Replace the spark plug if necessary.
Check the carburetor for clogs or dirt buildup. Clean or rebuild the carburetor as needed.

Proper fuel mixture maintenance can help ensure reliable starting and optimal engine performance for two-stroke dirt bikes.

11. Electrical problems

Electrical problems can also cause starting issues with a dirt bike. Here’s how electrical problems can cause starting problems:

Dead battery: A dead battery can prevent the engine from starting, as it provides the necessary power to turn the engine over.

Faulty starter motor or solenoid: A faulty starter motor or solenoid can prevent the engine from starting, as they are responsible for turning the engine over.

Ignition problems: Faulty ignition components, such as the ignition coil or CDI unit, can prevent the engine from starting by not providing the spark needed to ignite the fuel.

Wiring issues: Loose or damaged wiring can cause electrical issues that prevent the engine from starting.

To troubleshoot electrical problems, you can try the following:

Check the battery voltage and ensure it’s fully charged. If the battery is dead or weak, charge or replace it.
Check the starter motor and solenoid for proper function. If either part is faulty, they will need to be replaced.
Check the ignition components for damage or wear. Replace any faulty components as needed.
Inspect the wiring and connections for damage or corrosion. Repair or replace any damaged wiring or connections.

Proper electrical system maintenance can help ensure reliable starting and optimal engine performance.

12. Clutch problems

Clutch problems can also cause starting issues with a dirt bike. Here’s how clutch problems can cause starting problems:

Stuck clutch: A clutch that’s stuck in the engaged position can prevent the engine from turning over, as the clutch plates are not releasing properly.

Worn clutch plates: Worn clutch plates can prevent the engine from turning over by not providing enough friction to engage the engine.

Damaged clutch cable: A damaged or worn clutch cable can prevent the clutch from engaging or disengaging properly, preventing the engine from turning over.

To troubleshoot clutch problems, you can try the following:

Check the clutch cable for damage or wear. Replace the cable if needed.
Inspect the clutch plates for wear. Replace any worn plates as needed.
Check the clutch lever and actuator for proper function. Adjust or replace any faulty parts as needed.
Check the clutch basket and hub for damage or wear. Replace any damaged or worn parts as needed.

Proper clutch maintenance can help ensure reliable starting and optimal engine performance.

13. Carburetor flooding

Carburetor flooding is another potential issue that can cause starting problems with a dirt bike. Here’s how carburetor flooding can cause starting problems:

Too much fuel: A carburetor that’s flooding is delivering too much fuel to the engine, which can cause the engine to flood and prevent it from starting.

Faulty float valve: A faulty float valve can cause the carburetor to flood by not shutting off the fuel supply properly.

Dirty or clogged carburetor: A dirty or clogged carburetor can cause fuel to flow through the carburetor improperly, leading to flooding.

To troubleshoot carburetor flooding, you can try the following:

Turn off the fuel valve and let the engine sit for a few minutes to allow the excess fuel to drain out.
Check the float valve and clean or replace it as needed.
Inspect the carburetor for dirt or clogs. Clean the carburetor or replace any faulty components as needed.
Check the fuel lines for damage or wear. Replace any damaged fuel lines.

Proper carburetor maintenance can help ensure reliable starting and optimal engine performance.

14. Choke not engaged

Another potential reason why a dirt bike may not start is if the choke is not engaged properly. The choke is a mechanism on the carburetor that restricts airflow to the engine and enriches the fuel mixture, making it easier to start the engine when it’s cold.

If the choke is not engaged, the engine may not start because the fuel mixture may not be rich enough to ignite. Here’s how to troubleshoot the choke:

Check that the choke lever or knob is in the correct position for starting. The choke may be labeled as “on” or “closed” and should be engaged when starting the engine.

Make sure the choke is actually working. With the engine off, remove the air filter and look into the carburetor. When the choke is engaged, the choke plate should be closed, restricting airflow. If the choke plate is not closing, there may be a problem with the choke mechanism, such as a broken cable or faulty choke plate.

If the choke is working properly and the engine still won’t start, try adjusting the choke position. Sometimes the choke may need to be partially engaged to start the engine.

Proper choke maintenance can help ensure reliable starting and optimal engine performance.

15. Damaged or worn out spark plug wire

Another potential reason why a dirt bike may not start is a damaged or worn out spark plug wire. The spark plug wire delivers the electrical current from the ignition system to the spark plug, which ignites the fuel mixture in the engine.

If the spark plug wire is damaged or worn out, the electrical current may not be delivered properly to the spark plug, which can prevent the engine from starting. Here’s how to troubleshoot the spark plug wire:

Inspect the spark plug wire for signs of damage or wear, such as cracks, cuts, or breaks. If the wire is damaged, it should be replaced.

Check the connections at both ends of the spark plug wire to ensure they are secure and tight. Loose connections can cause a weak spark or no spark at all.

Use a spark tester to check the spark plug wire for proper spark. A weak or no spark indicates a problem with the wire or ignition system.

If the wire is in good condition but the engine still won’t start, check the spark plug itself. It may be fouled or worn out and in need of replacement.

Proper spark plug wire maintenance can help ensure reliable starting and optimal engine performance.

16. Fuel line problems

Fuel line problems can also cause starting problems with a dirt bike. Here are some ways fuel line problems can affect the starting of a dirt bike:

Clogged fuel line: A clogged fuel line can prevent fuel from reaching the carburetor, which can prevent the engine from starting.

Damaged fuel line: A damaged fuel line can leak fuel, which can prevent the engine from starting by causing a loss of fuel pressure.

Air leaks in the fuel line: Air leaks in the fuel line can cause a lean fuel mixture, which can prevent the engine from starting.

To troubleshoot fuel line problems, you can try the following:

Check the fuel lines for any visible damage, such as cracks or splits. Replace any damaged fuel lines.
Remove the fuel line from the carburetor and check for any debris or clogs. Clean the fuel line if necessary.
Check the fuel filter and replace it if it’s dirty or clogged.
Check the fuel tank vent to make sure it’s clear and not clogged.
Check for any air leaks in the fuel line. One way to check for air leaks is to spray carburetor cleaner or starting fluid around the fuel line and connections while the engine is running. If the engine speed increases, there is likely an air leak.

Proper fuel line maintenance can help ensure reliable starting and optimal engine performance.

17. Overheated engine

An overheated engine can also be a reason why a dirt bike won’t start. When the engine overheats, it can cause damage to various engine components and prevent the engine from starting.

Here are some ways to troubleshoot an overheated engine:

Let the engine cool down: If the engine is overheated, let it cool down for at least 30 minutes before attempting to start it again. This will allow the engine to cool down and reduce the risk of further damage.

Check the coolant level: Make sure the coolant level is adequate. If the coolant level is low, add more coolant and check for leaks.

Check for leaks: Inspect the engine for any coolant leaks or other signs of damage, such as cracks or breaks.

Check the radiator: Make sure the radiator is clean and free of debris. A dirty or clogged radiator can cause the engine to overheat.

Check the fan: Make sure the fan is working properly. The fan should turn on when the engine reaches a certain temperature.

Check the water pump: Make sure the water pump is functioning properly. The water pump circulates coolant throughout the engine to help regulate its temperature.

Proper engine maintenance can help ensure reliable starting and optimal engine performance.

18. Clogged exhaust system

A clogged exhaust system can also be a reason why a dirt bike won’t start. When the exhaust system is clogged, it can prevent the engine from starting by restricting the flow of exhaust gases and reducing engine performance.

Here are some ways to troubleshoot a clogged exhaust system:

Check the exhaust system: Inspect the exhaust system for any visible damage, such as dents, cracks, or holes. These can cause a blockage and prevent the engine from starting.

Check the muffler: Make sure the muffler is not clogged with dirt, debris, or carbon deposits. A clogged muffler can restrict the flow of exhaust gases and prevent the engine from starting.

Remove the spark arrestor: If your dirt bike has a spark arrestor, remove it and check for any clogs or blockages. A clogged spark arrestor can restrict the flow of exhaust gases and prevent the engine from starting.

Clean the exhaust system: Use a wire brush or compressed air to clean the exhaust system and remove any dirt, debris, or carbon deposits.

Check the air filter: Make sure the air filter is clean and not clogged. A dirty or clogged air filter can cause the engine to run too rich and produce excessive carbon deposits in the exhaust system.

Proper exhaust system maintenance can help ensure reliable starting and optimal engine performance.

19. Faulty kill switch

A faulty kill switch can also be a reason why a dirt bike won’t start. The kill switch is a safety feature that is designed to shut off the engine when activated. If the kill switch is faulty, it can prevent the engine from starting or cause it to shut off unexpectedly. Here are some ways to troubleshoot a faulty kill switch:

Check the wiring: Inspect the wiring connections on the kill switch and make sure they are secure and not damaged. Loose or damaged wiring can prevent the kill switch from functioning properly.

Test the switch: Use a multimeter to test the kill switch for continuity. If there is no continuity, the switch may be faulty and need to be replaced.

Clean the switch: If the switch is dirty or corroded, clean it with a contact cleaner spray and a soft-bristled brush. This can improve the switch’s functionality and help it operate properly.

Replace the switch: If the switch is damaged or cannot be repaired, it may need to be replaced. Consult your owner’s manual or a mechanic for instructions on how to replace the kill switch.

Proper electrical system maintenance can help ensure reliable starting and optimal engine performance.

20. Faulty fuel pump (for fuel-injected dirt bikes)

A faulty fuel pump can be a reason why a fuel-injected dirt bike won’t start. Fuel-injected dirt bikes use a fuel pump to deliver fuel from the tank to the engine.

If the fuel pump is faulty, it may not deliver enough fuel to the engine or may not deliver fuel at all. Here are some ways to troubleshoot a faulty fuel pump:

A. Check the fuel pump fuse: Locate the fuel pump fuse and check if it’s blown. If it’s blown, replace it and try starting the bike again.

B. Check the fuel pump relay: Locate the fuel pump relay and test it with a multimeter. If the relay is faulty, it may need to be replaced.

C. Check the fuel pressure: Use a fuel pressure gauge to check the fuel pressure at the fuel rail. If the fuel pressure is too low, the fuel pump may not be delivering enough fuel to the engine.

D. Check the fuel pump wiring: Inspect the wiring connections on the fuel pump and make sure they are secure and not damaged. Loose or damaged wiring can prevent the fuel pump from functioning properly.

E. Replace the fuel pump: If the fuel pump is not delivering fuel or is delivering fuel at an insufficient rate, it may need to be replaced. Consult your owner’s manual or a mechanic for instructions on how to replace the fuel pump.

Proper fuel system maintenance can help ensure reliable starting and optimal engine performance.

Conclusion

There are many possible reasons why a dirt bike may not start. Some common issues include a dead or weak battery, fuel problems, spark plug problems, ignition problems, air filter problems, engine problems, starter motor or solenoid problems, kickstarter mechanism problems, stale fuel, incorrect fuel mixture (for two-stroke engines), electrical problems, clutch problems, carburetor flooding, choke not engaged, damaged or worn out spark plug wire, fuel line problems, overheated engine, clogged exhaust system, faulty kill switch, and faulty fuel pump (for fuel-injected dirt bikes).

It’s important to properly maintain your dirt bike and troubleshoot any issues as soon as they arise to ensure reliable starting and optimal engine performance. If you’re unsure how to troubleshoot or repair a problem with your dirt bike, it’s best to take it to a mechanic for professional assistance.