How To Bump Start Motorcycle ~ future.housing.org.uk

## How To Bump Start Motorcycle

Push starting, bump starting, and pop starting are all terms utilized to portray the starting of a vehicle with an engine combustion without utilizing the regular start system. In the realm of motorcycling, bump starting can be an essential skill to possess, particularly when faced with scenarios where the motorcycle’s starter motor or battery has malfunctioned, leaving you stranded. Whether you’re a seasoned rider or a novice, grasping the intricacies of bump starting can empower you to overcome such challenges and resume your journey.

Before delving into the practicalities of bump starting, it’s essential to emphasize that this technique should only be employed as a last resort. Bump starting exerts significant stress on the motorcycle’s drivetrain, including the clutch, transmission, and rear wheel. Repeated or improper attempts can lead to premature wear and potential damage to these components. Hence, it’s imperative to proceed with caution and only consider bump starting if other starting methods, such as kickstarting or using a battery charger, are unavailable or unsuccessful.

To execute a successful bump start, you’ll require a gentle incline, preferably with a slight downhill gradient. Locate a suitable location where you can safely accelerate the motorcycle without encountering obstacles or traffic. With the ignition turned on, engage the motorcycle’s transmission into second gear. This gear provides an optimal balance between engine compression and torque for bump starting. Next, firmly hold the clutch lever and push the motorcycle forward, gradually increasing your speed as you do so. Once the motorcycle reaches approximately 5-10 mph, swiftly release the clutch lever while simultaneously applying a little throttle. The engine should now engage and start running, allowing you to continue your ride.

Understanding the Bump Start Procedure

Bump starting a motorcycle, also known as push-starting or clutch-starting, is a technique used to start an engine without using the starter motor. This method is particularly useful when the motorcycle’s battery is dead or the starter motor is malfunctioning.

To successfully bump start a motorcycle, it is crucial to follow a specific procedure and ensure that all safety precautions are taken:

Assess the surroundings:
- Choose a safe and open area with ample room to gain speed.
- Ensure there are no obstacles or hazards in the path.
- Find a slight downhill slope or flat surface to facilitate the starting process.
Engage neutral gear:
- Locate the motorcycle’s gear shifter and shift into neutral.
- Hold the clutch lever fully engaged to disengage the engine from the transmission.
Find an assistant:
- Ask a friend or helper to assist with the starting process.
- The assistant will be responsible for pushing the motorcycle forward to create momentum.
Prepare the engine:
- Turn on the ignition switch to activate the electrical system.
- Set the throttle slightly open to allow airflow into the engine.
Cue the assistant:
- Communicate with the assistant to start pushing the motorcycle.
- Instruct the assistant to push the motorcycle forward in a straight line.
Release the clutch and accelerate:
- As the motorcycle gains speed, slowly release the clutch lever to engage the transmission.
- Simultaneously, accelerate by twisting the throttle to provide additional fuel and air to the engine.
- The engine should start running once it reaches a sufficient speed.
Safety considerations:
- Wear a helmet and appropriate protective gear while performing the bump start.
- Ensure the motorcycle is securely in neutral before starting the pushing process.
- Avoid starting the motorcycle on an incline unless necessary.
- If the engine fails to start after several attempts, inspect the motorcycle for any underlying issues.

Safety Precautions for Bump Starting

1. Ensure a Safe Environment

Before attempting to bump start, find a safe and clear location with minimal traffic and obstacles. Ensure there is sufficient visibility and space to perform the maneuver safely.

2. Secure the Motorcycle and Gear

Secure the motorcycle by engaging the parking brake and ensuring it is in neutral gear. Wear appropriate safety gear, including a helmet, gloves, and protective clothing, to minimize the risk of injury in case of a fall or collision.

3. Inspect the Motorcycle

Prior to attempting a bump start, quickly inspect the motorcycle for any obvious issues, such as loose cables, damaged tires, or fuel leaks. If any concerns arise, address them before proceeding.

4. Seek Assistance

Bump starting can be easier and safer with assistance. If possible, ask a friend or bystander to help push or ride the motorcycle for additional momentum.

5. Clear the Area

Ensure that the surrounding area is clear of any obstacles, such as pedestrians, vehicles, or debris. This will provide a safe path for the motorcycle to roll and avoid collisions or injuries.

Preparing the Motorcycle for Bumping

1. Check the Transmission

Ensure that the motorcycle is in neutral by rolling it back and forth while holding the clutch lever. If the gear is not in neutral, shifting it into neutral may require some force.

2. Turn Off the Engine

Kill the engine by pressing the ignition kill switch or turning the key to the “off” position. This will prevent the engine from accidentally starting while you are bump starting.

3. Set the Choke

Adjust the choke to the appropriate position for starting, usually “on” or “half-on.” This will enrich the fuel mixture, making it easier for the engine to start.

4. Prepare the Clutch Cable

The clutch cable plays a crucial role in bump starting. Follow these steps to ensure it is properly adjusted:

Check Cable Tension: Grasp the clutch lever midway and pull it in. There should be about 1/4 to 1/2 inch (6-12 mm) of free play before the clutch engages.
Adjust Tension (if needed): If the free play is incorrect, adjust it using the cable adjuster near the clutch lever. Turn the adjuster clockwise to decrease free play or counterclockwise to increase it.
Lubricate Cable: Apply some lubricant to the clutch cable and its housing to ensure smooth operation.

Releasing the Clutch and Restarting the Engine

Once you’ve gained enough speed, it’s time to release the clutch and restart the engine. Follow these steps:

1. Slowly Ease Out the Clutch

As the bike rolls forward, gently release the clutch lever until you feel the bike begin to engage. Avoid letting the clutch out too quickly, as this can cause the bike to stall.

2. Control the Throttle

Simultaneously, gently roll the throttle forward to increase the engine speed. This will help the bike stay running as you release the clutch.

3. Keep Rolling

Continue releasing the clutch slowly while rolling the throttle. Once the engine catches, you can release the clutch completely.

4. Stabilize the Bike

As the bike starts running, keep your feet on the ground to stabilize it. Apply the brakes gently if necessary.

5. Shift into Gear

Once the engine is running smoothly, shift the bike into first gear and start riding normally.

6. Check for Obstacles

Before you start riding, take a quick look around to ensure there are no obstacles or hazards in your path.

7. Practice Regularly

Bump starting a motorcycle requires some practice. The more you practice, the more confident and efficient you’ll become.

8. Troubleshooting

If you encounter any issues while bump starting your motorcycle, refer to the following table for possible causes and solutions:

Problem	Possible Cause	Solution
Engine doesn’t start	Not enough speed Incorrect throttle control	Increase speed Adjust throttle
Bike stalls	Clutch released too quickly	Slowly ease out the clutch
Bike doesn’t move forward	Clutch not fully engaged Not in gear	Release the clutch completely Shift into gear

Positioning the Motorcycle for Bump Starting

Park the motorcycle on a slight downhill slope, facing forward. Ensure the transmission is in neutral and the clutch is disengaged.

Checking for Obstacles

Thoroughly inspect the path ahead for any potential obstacles or hazards that could impede the bump-starting process.

Running with the Motorcycle

Stand behind the motorcycle and grab both handlebars firmly. Run alongside the motorcycle, keeping pace with its eventual movement.

Engaging the Clutch

As you approach the desired speed, quickly engage the clutch while simultaneously releasing the throttle. This will momentarily stall the engine.

Releasing the Clutch

Once the clutch is engaged, immediately release it. The sudden tension in the drivetrain will initiate the bump-starting process.

Controlling the Throttle

As the engine starts, gently accelerate by gradually opening the throttle. This will help stabilize the engine and prevent it from stalling.

Riding the Motorcycle Safely after Bump Starting

After successfully bump-starting the motorcycle, it’s important to ride cautiously until you can safely troubleshoot the underlying issue:

Inspect the Engine

Check for any unusual noises or vibrations. If anything seems amiss, stop riding and have the motorcycle inspected by a mechanic.

Check the Battery Connections

Ensure that the battery terminals are clean and securely tightened. Loose connections can cause poor electrical flow, leading to starting problems.

Test the Charging System

Ride the motorcycle for a short distance and use a voltmeter to measure the voltage at the battery terminals. It should be around 14 volts when the engine is running.

Seek Professional Assistance

If the above troubleshooting steps do not resolve the issue, consider seeking assistance from a qualified mechanic who can diagnose and repair the problem.

Troubleshooting Common Issues with Bump Starting

1. Bike won’t roll in gear

– Ensure the bike is in neutral before starting.
– Check if the clutch lever is fully engaged.
– Make sure the rear brake is not depressed.

2. Bike won’t start after repeated attempts

– Verify that the spark plug is properly connected and in good condition.
– Clean the carburetor jets and fuel lines to eliminate any blockages.
– Check the battery terminals for corrosion and ensure proper connectivity.

3. Engine stalls after starting

– Adjust the idle speed to ensure the engine runs smoothly at low RPMs.
– Check the fuel mixture to ensure it’s not too lean, which can cause stalling.
– Tighten any loose bolts or connections that may affect engine stability.

4. Bike jerks or hesitates during acceleration

– Clean or replace the air filter to ensure adequate airflow.
– Inspect the fuel pump and fuel lines for any leaks or restrictions.
– Check the spark plug gap and replace if necessary.

5. Engine backfires when starting

– Reverse the polarity of the spark plug cables (for motorcycles with multiple spark plugs).
– Adjust the ignition timing to ensure it matches the manufacturer’s specifications.

6. Engine feels sluggish or underpowered

– Check the compression ratio by performing a compression test.
– Examine the valve clearances and adjust if necessary.
– Clean the exhaust system to eliminate any restrictions.

7. Bike overheats

– Ensure the coolant level is sufficient and the cooling system is working properly.
– Clean the radiator fins and coolant passages to improve heat dissipation.
– Inspect the thermostat for proper operation.

8. Electrical issues occur during bump starting

– Check the battery voltage and replace if necessary.
– Clean the battery terminals and connectors to remove corrosion.
– Inspect the alternator and voltage regulator for any malfunctions.

9. Clutch slipping

– Adjust the clutch cable tension to ensure proper engagement.
– Replace worn or damaged clutch plates or friction discs.

10. Difficulty finding neutral

Causes	Solutions
Worn shift forks	Replace worn shift forks
Misaligned shift linkage	Adjust shift linkage according to the manufacturer’s specifications
Clutch drag	Ensure clutch lever is fully disengaged and clutch plates are not sticking
Bent shift drum	Inspect and replace bent shift drum
Damaged neutral switch	Replace damaged neutral switch