Starting a moped engine using a kickstarter is not just a routine procedure, but an important skill that helps in any situation when the electric starter fails or the battery is low. However, over time, the mechanism may begin to jam, make an unpleasant grinding noise, or completely stop engaging the flywheel, making starting impossible without intervention.
Many owners mopeds They are afraid to climb inside the crankcase for fear of breaking fragile plastic parts or stripping threads, but in fact the kickstarter design is quite simple and straightforward for home repairs. In this article, we will analyze in detail the process of dismantling, inspecting and restoring the functionality of this unit, so that you can solve the problem yourself in a few hours.
Preparing tools and work area
Before you begin physical disassembly, you need to organize your workspace and prepare the necessary tools. Not only the speed of work depends on the quality of preparation, but also the safety of parts that can easily get lost or damaged if handled carelessly.
You will need a set of wrenches and screwdrivers specific to your type of moped. The most commonly used wrenches are 10, 12 and 14 millimeter wrenches, as well as Phillips screwdrivers of different sizes. Don't forget about a hammer with a rubber striker, which is useful for carefully knocking out the axles without damaging the metal.
- 🔧 Set of wrenches and socket heads
- 🛢️ Container for washing parts in gasoline or kerosene
- 🧽 Clean rags and gloves to protect your hands from oil
- 🧴 Fresh lubricant (lithol, graphite or special for gearboxes)
It is important to remove the moped from the stand and place it on the center stand so that the wheel rotates freely and the engine does not rest on the ground. This will provide easy access to the crankcase and allow you to check the rotation of the crankshaft after assembly.
⚠️ Attention: Before starting work, be sure to make sure that the moped is in neutral gear to prevent accidental starting of the engine when cranking the crankshaft.
Removing the kickstarter pedal
The first step in disassembly is to remove the outer pedal, which is attached directly to the kickstarter shaft. It is usually secured with a locking bolt or nut located on the side or end. Loosen the fastener, but do not unscrew it completely until you check for the presence of the lock washer.
If the pedal is tight and cannot be removed by hand, use a lever puller or carefully pry it off with a pry bar, placing a wooden spacer so as not to bend the metal. Some models mopeds type “Planet” or “Sunrise” the pedal can be fastened with two bolts that need to be unscrewed with a Phillips screwdriver.
After removing the pedal, you will see the mechanism shaft sticking out. Clean it of dirt and old grease to make further work easier. Check the condition of the splines on the shaft - if they are worn out, the pedal will slip and will need to be replaced with a new one.
- 🔩 Unscrew the pedal fixing bolt or nut
- 🪚 Gently remove the lever without using excessive force
- 🧹 Clean the shaft splines from adhering dirt and oil
☑️ Pedal removal tools
Sometimes a situation arises when the pedal bolt is stuck tightly due to moisture and corrosion. In this case, you should not immediately hit it with a hammer; it is better to use a penetrating lubricant (WD-40) and wait 10-15 minutes until it loosens the rust.
⚠️ Warning: Do not attempt to remove a pedal bolt if it is heavily rusted without first treating it with penetrating lubricant - you risk stripping the threads in the aluminum crankcase housing.
Removing the crankcase cover and mechanism housing
After removing the pedal, it is the turn of the crankcase cover, which covers the kickstarter mechanism. On most mopeds this is a separate cover on the right side of the engine, but on some models it may be part of the overall alternator cover. Unscrew all the bolts around the perimeter of the cover and carefully remove it.
If the cover sticks to the gasket, do not try to pry it off with a screwdriver, as aluminum is very soft and easily deformed. Use a spacer spatula or simply tap the end of the lid with a wooden block. Once the cover is removed you will see the spring and ratchet mechanism.
- 🔩 Unscrew all bolts securing the crankcase cover
- 🔨 Gently tap the lid to remove it from the gasket
- 📸 Take a photo of the location of the parts before disassembling
Inside you will see a kickstarter spring that is under tension. Be extremely careful when removing it as it may come loose and cause injury. It is recommended to pre-fix the spring using pliers or a special clamp before releasing its tension.
Next, you need to remove the kickstarter shaft itself. It is usually held in place by a retaining ring or nut on the inside of the crankcase. Remove the retaining ring using thin-nose pliers and carefully remove the shaft along with the ratchet and gear.
What to do if the spring breaks?
If the spring breaks apart during disassembly, don't panic. Just assemble it piece by piece, using the old spring as a template, or buy a new one at a parts store. The main thing is to install it correctly in place and fix the ends in the grooves.
On some designs, such as mopeds with two-stroke engines, the kickstart mechanism may be more complexly integrated into the crankcase, requiring removal of the entire crankcase to completely disassemble it. This is a more labor-intensive procedure requiring removal of the clutch and crankshaft.
The most important step in removing the cover is to be careful when working with aluminum parts so as not to damage the sealing plane.
Diagnostics and cleaning of parts
After all parts have been removed, they must be carefully inspected and cleaned. Dirt, carbon deposits and old thickened grease are the main enemies of the kickstarter mechanism. Place all metal parts in a container with gasoline or kerosene and leave for 15-20 minutes to soften the dirt.
Pay special attention to the ratchet and gear. Check the condition of the teeth on the gear and pawl (ratchet). If the teeth are chipped or severely worn, the mechanism will not be able to engage the flywheel and the pedal will fail. In this case, replacement of parts is required.
| Detail | Signs of wear | Recommendation |
|---|---|---|
| Spring | Stretched, there are cracks | Replacement with a new one |
| Gear | Chips, worn teeth | Gear replacement |
| Dog | Worn edge, jamming | Replacement or polishing |
| Shaft | Scratches, development of splines | Shaft replacement |
| Housing | Cracks, deformation | Welding or replacement |
Clean the seats in the crankcase from the remnants of the old gasket and sealant. Use a plastic spatula or wooden skewer to avoid scratching the surface. After cleaning, wipe all parts with a dry cloth and blow with compressed air, if possible.
- 🧼 Wash parts in solvent or gasoline
- 🔍 Inspect the gear teeth and pawls for chips
- 🧹 Remove the remains of the old gasket from the crankcase
- 💨 Blow the parts with compressed air to remove moisture
Check the condition of the bushings in which the kickstarter shaft rotates. If the bushings are worn out, the shaft will wobble and the mechanism will not work correctly. In this case, it may be necessary to replace the bushings or flare the seats.
- Every season
- Once a year
- Only in case of breakdown
- Never served
⚠️ Attention: Never use metal brushes to clean aluminum parts, as this can cause deep scratches and disrupt the geometry of the seats.
Lubrication and assembly of the mechanism
After cleaning and diagnostics, the assembly and lubrication stage begins. Use high-quality lubricant designed to work under conditions of high loads and temperature changes. Lithium greases or special gear oils are excellent for this purpose.
Apply a thin layer of lubricant to all rubbing surfaces: shaft splines, gear teeth, pawl and rotation axes. Do not overuse the lubricant, as excess may leak out and contaminate the clutch or brake pads.
Install the kickstarter spring in place, observing the direction in which it is wound. This is a critical point: if the spring is not installed correctly, it will not return the pedal to its original position or will be too tight. Make sure that the ends of the spring are securely locked in the grooves.
- 🛢️ Apply lubricant to gears and bushings
- 🔄 Install the spring in the correct direction
- 🔩 Secure the shaft with a locking ring or nut
- 🧵 Apply sealant to the crankcase cover gasket
Reinstall the crankcase cover, first checking the condition of the gasket. If the old gasket is damaged, be sure to replace it with a new one. Apply a thin layer of sealant to the gasket to seal, but do not allow it to get into the crankcase.
Tighten the cover bolts in a crisscross pattern to ensure an even seal. Do not over-tighten the bolts to avoid stripping the threads in the aluminum housing. After assembly, check the rotation of the pedal - it should move smoothly, with a characteristic click when hooked.
Before final tightening of the crankcase cover bolts, check that the kickstarter shaft is not jammed by pressing the pedal several times.
If you encounter difficulties during the assembly process, for example, the spring does not fit into place, do not use force. Disassemble the mechanism and check that the parts are installed correctly; perhaps you missed something at the diagnostic stage.
High-quality lubrication and correct installation of the spring are the key to long-lasting operation of the kickstarter and easy engine starting.
Common problems and their solutions
Sometimes, even after proper assembly, the kickstarter may not work correctly. One common problem is that the pedal "slips" when the pedal is depressed but the engine does not turn over. This is usually due to a worn pawl or spring that is unable to force it against the gear.
Another problem is that the pedal travel is too tight. This may be caused by a misaligned shaft, incorrect installation of the spring, or dirt getting inside the mechanism. In some cases, the cause may be insufficient clearance between the gear and flywheel.
- 🔧 Check the tension of the kickstarter spring
- 🔍 Inspect the dog for wear
- 🧹 Make sure there are no foreign objects in the crankcase
- ⚙️ Check the clearance between the gear and flywheel
If the problem does not resolve after standard cleaning and lubrication, a more in-depth engine diagnostic may be required. For example, worn splines on the crankshaft or damage to the flywheel can cause the kickstarter to malfunction.
In some cases, replacing the lubricant with a thicker one or, conversely, a thinner one, depending on climatic operating conditions, helps. In winter, it is better to use special low-temperature oils to prevent the mechanism from freezing.
Why does the kickstarter get stuck in the pressed position?
Sticking in the pressed position is often caused by the pawl not returning to its original position due to dirt or a broken spring. The cause may also be shaft misalignment.
FAQ: Answers to frequently asked questions
How often should the kickstarter be lubricated?
It is recommended to lubricate the kickstarter mechanism at least once a season, and during intensive use - every 500-1000 kilometers.
Can motor oil be used to lubricate the kickstarter?
Motor oil is not recommended for permanent lubrication as it washes out quickly and does not provide sufficient wear protection. It is better to use a special gearbox lubricant or litol.
What to do if the kickstarter spring is broken?
A broken spring must be replaced with a new original one or one with similar characteristics. Trying to twist it from wire is not recommended, as this can lead to damage to the mechanism.
Why doesn't the kickstarter return the pedal?
This may be caused by a weak or broken spring, a stuck pawl, or a misaligned shaft. It is necessary to disassemble the mechanism, clean the parts and check the condition of the spring.
Do I need to change the gasket every time I remove the cover?
It is advisable to change the gasket each time the cover is removed to ensure the crankcase is sealed. An old gasket may be damaged and will not provide adequate seal from the oil.