Understanding the Kickstart of V-twin Motorcycle Engine Model | Stirlingkit

Understanding the Kickstart of V-twin Motorcycle Engine Model | Stirlingkit

Understanding the Kickstart of V-twin Motorcycle Engine Model | Stirlingkit

Understanding the Kickstart of V-twin Motorcycle Engine Model | Stirlingkit


Harley-Davidson's V-twin engine is an iconic part of the brand's history and identity. One of the key components of this engine is the kick start, which has been a part of Harley-Davidson motorcycles for over a century. The kick start is a simple mechanism that allows the rider to start the engine manually by kicking down on a lever located on the right side of the bike.

The kick start of the Harley V-twin engine model is a traditional starting mechanism that uses a lever attached to the engine's crankshaft to manually turn the engine over. To start the engine, the rider would push the kick start lever down with their foot, causing the engine to turn over and start running. This method of starting the engine is popular among Harley riders as it gives a unique experience and a sense of tradition. However, modern Harley models usually come with an electric starter as well.

The kick start on Harley-Davidson V-twin motorcycles serves as a backup starting method in case the electric starter fails. It is not a necessity to have a kick start on a Harley V-twin, as the electric starter is the primary starting method and is reliable in most cases.

However, some Harley riders prefer the kick start for aesthetic or nostalgic reasons, as it harkens back to the early days of motorcycling when kick starting was the only option. Additionally, some riders feel that using the kick start provides a more direct connection with the bike and can be a fun and engaging way to start the engine.

Ultimately, whether or not to have a kick start on a Harley V-twin comes down to personal preference. Some models may not even offer a kick start as an option, while others may have it as a standard or aftermarket accessory. If you prefer the look or feel of a kick start, then it may be worth considering adding one to your Harley-Davidson V-twin motorcycle.



The kick start system on Harley V2 motorcycles is a robust and reliable mechanism that provides a satisfying manual starting experience for the rider. It consists of several components, each with a specific function. When the rider kicks down on the kick starter lever, it rotates the kick starter shaft, which in turn rotates the kick starter gear. The kick starter gear engages with the engine's primary drive gear, turning the engine over and starting it. The spring provides the necessary resistance to ensure that the kick starter gear engages properly with the engine's primary drive gear.

First, kick start lever.

It is connected to the kick start shaft and  usually located on the right side of the motorcycle. The shaft is a metal rod that runs through the transmission and connects to the crankshaft of the engine. When the rider kicks down on the lever, the shaft turns the crankshaft, which in turn starts the engine. 

The kick start mechanism also includes a ratchet mechanism that prevents the lever from returning to its starting position when the rider releases it. This ensures that the engine continues to turn until it fires up.

Second, Kick start shaft.

This is a metal shaft that runs through the engine casing and connects the kick starter lever to the engine. It is a lever that is usually located on the right-hand side of the motorcycle and is operated by the rider's foot. The kick start shaft is connected to the engine's crankshaft through a gear mechanism. When the rider presses down on the kick start lever, it turns the gear, which in turn rotates the engine's crankshaft, causing the engine to start. The mechanism is spring-loaded, so after the rider kicks down on the lever, it returns to its original position.

Third, Kick start gear. 

This is a small gear located on the end of the kick starter shaft that meshes with the transmission gear and the crankshaft gear. The gear ratio between these components determines how much force the rider must apply to the lever to start the engine.

It is a shaft that extends from the engine's transmission, through the motorcycle's primary drive, and terminates at the end of the kickstarter lever. It must be strong enough to handle the forces applied by the rider, and the gears must be properly aligned and lubricated to ensure smooth and reliable starting.

Fourth, Spring.

It is a coiled spring that is located inside the engine casing and provides resistance to the kick starter gear, allowing it to engage with the engine's primary drive gear. Springs are an essential component of a motorcycle's suspension system. They help to absorb the shocks and vibrations that are generated by the road surface, providing a smoother ride for the rider. Springs are also responsible for maintaining the proper height and balance of the motorcycle.

The most common type of spring used in motorcycle suspensions is the coil spring. This type of spring is made up of a series of tightly wound metal coils, which compress and expand as the suspension is activated. The rate at which the spring compresses and expands is determined by its stiffness, or spring rate. Springs with a higher spring rate are stiffer and offer a firmer ride, while springs with a lower spring rate are softer and provide a more comfortable ride.

The spring is typically mounted on a shock absorber, which is responsible for dampening the shocks and vibrations generated by the spring. The shock absorber contains a piston and hydraulic fluid, which helps to absorb the energy generated by the spring and dissipate it as heat.


What Happens Inside The Engine Upon Kick Starting?

When you kick start an engine, you are essentially initiating the process of combustion, which powers the engine. The following is a general overview of what happens inside the engine upon kick starting:

Fuel is mixed with air: The carburetor or fuel injection system mixes fuel and air in the correct proportions, which is essential for combustion to occur.

Intake stroke: When the engine piston moves down on the intake stroke, a mixture of fuel and air is drawn into the combustion chamber.

Compression stroke: As the piston moves back up on the compression stroke, the fuel and air mixture is compressed into a smaller space, which increases the pressure and temperature of the mixture.

Ignition: At the top of the compression stroke, the spark plug fires, igniting the fuel and air mixture. This creates a small explosion that pushes the piston down on the power stroke.

Exhaust stroke: As the piston moves back up on the exhaust stroke, the waste gases from the combustion are expelled out of the engine through the exhaust valve.

Repeat: The process then repeats itself, with the piston moving down on the intake stroke to draw in a new mixture of fuel and air.

When you kick start an v-twin engine, you are essentially turning the engine over and initiating the intake stroke, which draws the fuel and air mixture into the combustion chamber. The rest of the process is then initiated by the spark plug firing and the resulting combustion.



Is it Hard to Make A kickstart for motorcycel vtwin engine model?

The complexity of creating a kickstart for a motorcycle v-twin engine model depends on various factors such as the design of the engine, the size of the engine, and the materials used. In general, creating a kickstart for a motorcycle v-twin engine model can be challenging, especially for those without mechanical or engineering experience. The process requires a good understanding of the engine's internal workings and the necessary components to create the kickstart mechanism.

Additionally, the fabrication process of the kickstart assembly can be quite involved, requiring access to specialized tools and equipment. It's important to note that safety precautions should always be taken when working with machinery and tools to avoid injuries.



How to kick start the Motorcycle?

Kicking starting a classic motorcycle can be a little tricky, but it is also an essential part of the riding experience. Here are the general steps to kick start a motorcycle:

  1. Check the fuel and oil levels: Before you attempt to start the engine, make sure that the fuel and oil levels are sufficient. If they are low, fill them up to the recommended level.
  2. Turn on the fuel valve: If your motorcycle has a fuel valve, turn it on to allow fuel to flow to the carburetor.
  3. Set the choke: If your motorcycle has a choke, set it to the "on" position to make starting easier, especially when the engine is cold.
  4. Turn the ignition key to "on": Make sure the ignition key is in the "on" position to allow the electrical system to function.
  5. Place the motorcycle in neutral: Make sure the motorcycle is in neutral, as attempting to start the engine while it is in gear can be dangerous.
  6. Prime the engine: Pull the decompression lever if your motorcycle has one and then gently push the kickstart lever down to prime the engine. Repeat this process a few times to ensure that the engine is primed.
  7. Kickstart the engine: Once the engine is primed, place your foot on the kickstart lever and give it a strong, deliberate kick. You may need to repeat this process a few times before the engine starts.
  8. Adjust the choke: Once the engine is running, adjust the choke to the "off" position gradually. This will help the engine to warm up and run smoothly.
  9. Let the engine warm up: Allow the engine to warm up for a few minutes before you attempt to ride the motorcycle.


NOTE: The exact steps may vary slightly depending on the make and model of the motorcycle, so always refer to the owner's manual for specific instructions. Also, be sure to wear proper riding gear and follow all safety guidelines when operating a motorcycle.


7 Tips when when you are trying t kick start the motorcycle engine model

Kick starting a motorcycle engine can be physically demanding, especially for larger or older motorcycles. Take breaks as needed and don't overexert yourself. If you're having trouble kick starting the engine, consider having a mechanic take a look to ensure everything is in proper working order.

Check the Fuel and Air: Ensure that the fuel tank has enough fuel and that the air filter is clean before attempting to kick start the engine.

Neutral Gear: Make sure the motorcycle is in neutral before attempting to kick start the engine. If the motorcycle is in gear, it may lurch forward when you kick start it, which can be dangerous.

Brake: Use the rear brake to hold the motorcycle in place while kick starting it. This will prevent the motorcycle from moving forward or backward when you apply pressure to the kick start lever.

Compression Release: Many motorcycles have a compression release lever or button that you can use to reduce the pressure in the engine while kick starting it. This will make it easier to turn over the engine.

Smooth Motion: When you kick start the engine, use a smooth and deliberate motion. Don't just jab at the lever, but instead, use a controlled motion to build up momentum and then release it quickly.

Repeat: If the engine doesn't start on the first kick, try again. It may take a few attempts to get the engine started, especially if the motorcycle has been sitting for a while.

Safety Gear: Wear proper safety gear, including a helmet, gloves, and boots, when kick starting a motorcycle engine. This will help protect you in case of a fall or other mishap.


Electric Start Vs. Kick Start, which one is better?

Electric start and kick start are two different methods of starting a motorcycle's engine. Before the motorcycle engine runs, the piston must move first to compress the mixture and burn to provide power. Traditional motorcycles are started by pedaling. By stepping down the starting lever with your foot, the motion is transmitted to the crankshaft through the gear to make it rotate. The main method is to directly transmit the motion force to the front of the clutch by the start lever, so that even if the clutch is closed, it can still be started. Many traditional underbone motorcycles use this method. In addition, it is secondary to transmit the movement of the starting lever to the transmission. This method needs to transmit the movement to the crankshaft through the clutch. If the clutch is not opened, the engine cannot be started.

The electric starting method reduces the speed of the starter motor through gears, increases the torque, and makes the crankshaft rotate. To put it simply, you only need to press the switch on the right hand handle, and the vehicle can be started by electric ignition. Although it seems to be a simple and easy way to start, it requires a battery that can provide a large current to the high-power starter motor. Currently The battery voltage of most motorcycles is 12V. For electric-start motorcycles, the vehicle should be started frequently to maintain the characteristics of the battery, otherwise the long-term storage battery is easy to lose power. Many electric-start motorcycle batteries need to be replaced after less than one or two years of use. There is no such thing as a foot-operated motorcycle. Let us comb through the camparison in the following aspects.

1st, Ease of Use.

Electric start is much easier to use, just turn the key and press a button.

Kick start, more physically demanding, you have to use your leg to kick-start the engine.

2nd, Reliability. 

Electric start are generally more reliable than kick start systems. No need toworry about the battery running low or the starter motor failing.

Kick start systems can be prone to failure due to worn out parts or operator error.

3rd, Maintenance.

Electric start requires little to no maintenance.

Kick start systems require periodic adjustment to ensure proper operation.

4th, Cost. 

Electric start systems are more expensive due to the additional components required, such as the starter motor, battery, and wiring.

5th, Convenience.

Electric start systems are more convenient, especially in cold weather. It works well in all temperatures.

kick start is difficult to start the engine in cold weather.


Electric start systems are more convenient, reliable, and easy to use, only flaw is the cost. For motorcycles with fewer electronic devices, the pedal-type start is still used. Kick start systems are more mechanically simple and have a certain appeal to riders who prefer a more traditional motorcycle experience. Although the pedal-type start method is relatively laborious, if you do not grasp it well, you may hurt your feet due to the rapid rebound of the starter lever. The electric start method will be the mainstream method at present and in the future. After all, the electronic configuration of motorcycles is becoming more and more abundant. Although the consumption of the battery is large, the more convenient and simple electric start is still more popular. Ultimately, the choice between electric start and kick start will depend on the rider's personal preferences and the type of motorcycle they are using.



Dennis: When when when we build our stuff, it's a matter of choice. It's a matter of current events. It's amatter of a lifestyle. However, I think back in the old days, bike was a different lifestyle, cars we all got thrown under the bus for that too. However, rock and roll is a lifestyle, metal, is a lifestyle. disco, was a lifestyle. and that's gone now. So all these lifestyles are here today amongst us all. So the reason that I decided to install the Kickstart on my V-Twin motorcycle build it wasn't easy it was because it was hard it was really hard and this is the the best thing I've ever seen in my life that come out of China. It is super Overkill and it helped me out on my build in a weird way.






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What is the Electric start plan for our CISON V-twin V2 Engine Four-stroke Air-cooled Motorcycle RC Gasoline Engines?

We have been trying the electric start, but the gear drive and the one-way bearing have encountered several problems, and we will always try to solve it. The original reserved position is not good, the reducer sweeps the teeth, and we are still looking at whether there is a suitable reducer. If it doesn't work, the gear machine at the factory will be scrapped. We are putting efforts on it. If there is any news, we will post relevant videos or pictures to social media platforms as soon as possible.

While the kick start may seem like a relic of the past, it still serves an important function on Harley-Davidson motorcycles. It provides a backup method of starting the engine in case the battery or starter motor fails, and it also allows riders to experience the thrill of starting their bike with a physical kick. Kick-starting a motorcycle can be a satisfying experience for riders who appreciate the traditional method of starting a bike. It can also be seen as a throwback to a simpler time in motorcycle history.

So we designed and released our motorcycle kick start in 2022, to serve as an essential part of Our Cison Panhead V-twin engine, play a vital role in the brand's heritage and tradition and to spice your motorcycle life.  



How to install the kickstart of Mini Harley Davidson Panhead Vtwin Engine?

You can watch the reference video below.


Other videos you may wanna watch. 

Upgrade Motorcycle Kick Start for 9cc V-Twin Engine Model



Other v-twin engine model blogs you may wanna read.

Cison Fires up First Tests of the new Shovelhead V2 engine 2022

10 Popular Engine Modifications for Your CISON FG-VT9 V2 Engine | Stirlingkit

Q&A Questions for CISON FG-VT9 9cc V-twin V2 Engine

More Details about CISON FG-VT9 9cc V-twin V2 Engine




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