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Hangzhou UCAN Trading Co., Ltd
We are prefessional motorcycle spare parts manufacturer &exporter, establlished in Hangzhou since 2009.We have been exporting parts to different countries for many years.We mainly products is full body fairing parts forscootermotorcycle(mainly HONDA/YAMAHA),and OEM quality engin parts for scootermotorcycle&ATV,UTV. We have always maintained a customer-centered philosophy and strive to exceed our customers' expectations and become a leading brand in the field of motorcycle parts and accessories. Whether you are an existing customer or a potential partner, we look forward to establishing a long-term relationship with you and working together to achieve the goal of mutual benefit and win-win situation.
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Factory
With our excellent manufacturing technology and strict quality management system, our products enjoy a good reputation in the market. We focus on technological innovation and product development to continuously improve the quality and performance of our products to meet the needs and expectations of our customers.
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We have always been committed to providing our customers with the assurance of high quality and efficiency to meet their needs and expectations for our products and services.
Produced Products
We mainly productsis full body fairing partsfor scooter motorcycle(mainly HONDA/YAMAHA),and OEM quality enginparts for scootermotorcycle &ATV,UTV.
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The primary clutch is an essential component that enhances the performance of your vehicle. This clutch is designed to provide maximum torque and power to the wheels, enabling your motorcycle to tackle the toughest terrains with ease.The primary clutch is constructed with high-quality materials that ensure durability and longevity. It features a smooth engagement and shifting, which enhances your overall riding experience. The clutch has been designed to withstand extreme conditions and high rpms, ensuring that you can push your motorcycle to its limits without worrying about any clutch failures.The clutch is also lightweight, reducing overall vehicle weight and improving acceleration. It is easy to install, and its low maintenance requirements allow for easy upkeep.
Advantages of Primary Clutch
Smooth gear changes
A well-functioning clutch allows for seamless and controlled gear shifts, enabling smooth acceleration and deceleration of the vehicle.
01
Improved fuel efficiency
A properly adjusted clutch minimizes slippage, which can otherwise lead to energy losses and reduced fuel economy.
02
Enhanced vehicle control
The clutch gives the driver precise control over the power transfer from the engine to the drivetrain, allowing for better maneuverability and responsiveness, particularly in stop-and-go traffic or while maneuvering the vehicle.
03
Longer component lifespan
A high-quality clutch that is properly maintained can last for many years and miles, reducing the need for frequent and costly replacements.
04
Improved drivability
A smooth, responsive clutch contributes to an overall more enjoyable and comfortable driving experience, especially for manual transmission vehicles.
05
Types of Primary Clutch
Wet Clutch
These clutches are bathed in engine oil, reducing friction and providing smoother operation. They are a common application in most types of motorcycles. Friction is reduced, making it easier to use gears to change speed. Advantages: Less wear and tear, lower heat generation, smoother operation. Best Suited For: Almost all types of motorcycle.
Dry Clutch
A dry clutch is mostly found in performance-oriented motorcycles. It has friction plates and disc plates in its clutch assembly that are not bathed in lubricating oil. Due to the lack of lubrication, they tend to create a unique sound. They can handle a large amount of power from the motorcycle engine but require frequent maintenance. Advantages: Less slippage, quicker power transfer. Best Suited For: High-performance motorcycle.
Slipper Clutch
The saviour in racing scenarios, this clutch prevents the rear wheel from locking up during aggressive downshifts.Advantages: Avoids wheel hop during quick deceleration. Best Suited For: Racing motorcycles.
Centrifugal Clutch
This no-fuss clutch engages and disengages using centrifugal force, perfect for scooters and smaller motorcycle.Advantages: Simple, low-maintenance. Best Suited For: Small motorcycles and scooters.
Hydraulic Clutch
The clutch for the adrenaline junkies. Common in high-performance motorcycle.Advantages: Smooth operation, less manual effort. Best Suited For: High-performance motorcycle.
Cable Clutch
The nostalgic choice, often found in older motorcycles.Advantages: Easy to repair, budget-friendly. Best Suited For: Older or vintage motorcycles.
Electromagnetic Clutch
The future is here with this clutch that uses electromagnetic fields for operation.Advantages: Minimal maintenance, highly efficient. Best Suited For: Scooters and some small motorcycles.
Dog Clutch
The performance beast, mainly seen in racing motorcycles. Advantages: Extremely quick shifts, high durability. Best Suited For: Racing motorcycles.
Multi-Plate Clutch
These are the ubiquitous clutches, found in a variety of motorcycle, consisting of multiple friction and steel plates. Advantages: High torque handling, reliable. Best Suited For: General-purpose motorcycles.
Single Plate Clutch
The simplified version often found in cars, but also in some light motorcycles. Advantages: Simple design, easier maintenance. Best Suited For: Cars and light vehicles, less common in motorcycles.
Cone Clutch
Old but gold, the cone clutch is rarely seen in modern motorcycle but has its niche. Advantages: High torque capacity due to increased surface area. Best Suited For: Specialized applications, older models.
Motorcycle Primary Clutch Installation Guide
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Step |
Description |
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Tools and Materials Needed |
Socket set and wrenches Torque wrench Screwdrivers (flathead and Phillips) Pliers Clutch alignment tool New clutch kit (friction plates, steel plates, springs) Gasket sealant Clean rags Engine oil |
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1. Preparation |
Consult your motorcycle's service manual for specific instructions and torque specifications. Ensure your bike is on a stable stand with the rear wheel off the ground. |
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2. Drain the Oil |
Remove the oil drain plug and drain the engine oil into a suitable container. |
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3. Remove the Clutch Cover |
Carefully remove the clutch cover bolts and gently pry off the cover. Clean any old gasket material from the cover and engine case. |
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4. Remove the Old Clutch |
Loosen the clutch spring bolts in a crisscross pattern. Remove the pressure plate, clutch plates, and clutch hub if necessary. |
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5. Inspect Components |
Check the clutch basket for wear or notching. Examine the clutch hub and inner hub for damage. |
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6. Install the New Clutch |
Stack the new steel and friction plates in the correct order, as specified in your manual. Use a clutch alignment tool to ensure proper centering. |
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7. Replace the Pressure Plate and Springs |
Install the pressure plate and new clutch springs. Tighten the spring bolts in a crisscross pattern to the specified torque. |
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8. Reassemble |
Apply a thin bead of gasket sealant to the clutch cover (if required). Carefully reinstall the clutch cover and tighten bolts to the specified torque. |
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9. Refill Oil and Adjust |
Refill the engine with the recommended type and amount of oil. Adjust the clutch cable or hydraulic system as needed. |
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Common Pitfalls to Avoid |
Incorrect Plate Order: Mixing up the order of steel and friction plates can lead to clutch failure. Over-tightening: Always use a torque wrench to avoid damaging components. Contamination: Keep all components clean and free from oil or debris during installation. Forgetting to Adjust: Failing to properly adjust the clutch after installation can result in poor performance. |
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Final Checks |
Start the engine and check for any unusual noises or leaks. Test the clutch engagement and disengagement while stationary. Take a short test ride to ensure proper clutch operation. |
What Are the Materials Used for Making Motorcycle Primary Clutch
Motorcycle clutch are typically made from the following materials:
Steel: The base or core of the clutch is usually made of steel, providing the necessary structural integrity and strength to withstand the high torque and friction forces during clutch engagement and disengagement.
Friction material: The surfaces of the clutch are covered with a friction material, often made of a composite material containing a combination of materials such as:
●Organic materials like kevlar, paper, or cotton
● Metallic materials like copper, brass, or steel
● Synthetic materials like carbon fiber or ceramic
The friction material is designed to provide high and consistent coefficient of friction, allowing the clutch to transmit power efficiently from the engine to the transmission while also enabling smooth engagement and disengagement of the clutch.
Cushioning material: Between the steel core and the friction material, there may be a layer of cushioning material, such as springs or elastomeric dampers. This helps to absorb shock and vibrations, providing a smoother and more progressive clutch feel during operation.
Anti-judder material: Some clutch may also incorporate an anti-judder material, typically a soft, porous material, to help dampen any juddering or shuddering that can occur during clutch engagement.
How to Choose Motorcycle Primary Clutch
Vehicle weight plays a big role when choosing a clutch. Many older motorcycle are very heavy and have engines that produce high torque numbers at lower engine speeds. This creates a high load situation on the clutch that can result in a slipping/overheating clutch if the wrong clutch is selected. The heavier the vehicle, the higher the load on the clutch and the more clamp pressure needed to move the vehicle.
Knowing how much horsepower and torque will give you a good idea of what clutch is needed for you application. The higher the operating RPM range of an engine, the more centrifugal clamp pressure is applied by the pressure plate. High torque, low RPM applications will require higher clamp pressures while lower torque, higher RPM applications will require lighter clamp pressures.
High rear end gearing puts heavier load on the clutch system as well. If you have ever tried to let out the clutch from a stop in second gear, you likely experienced difficulty getting the vehicle moving without ‘bogging' the engine. This same effect occurs when too high of rear end gearing is used. This situation also requires the clutch to be slipped more on takeoff to make a smooth transition, resulting in accelerated wear to the clutch.
Tires with more traction, such as drag radials or slicks, allow the vehicle to hook up harder and are less likely to spin than street tires. When a tire spins, the load on the driveline is decreased, but when the tire hooks up, the load on the clutch is increased substantially requiring more clamp pressure.
The intended use of the vehicle when choosing a clutch is the most important consideration. A clutch designed for better performance in your street motorcyclewill not work overall in terms of longevity if you drive real aggressive. Clutch kits are available for street performance to all out racing and everything in-between so be sure you choose the right clutch for your driving style.
What is Driven Clutch
The driven clutch is a key component of the vehicle's powertrain system. When the engine is running, this clutch engages with the vehicle's drive belt to transfer power from the engine to the wheels in order to propel the motorcycle forward. The driven clutch works in conjunction with the primary clutch to provide smooth acceleration and reliable performance at all speeds. It is an essential part of the motorcycle overall performance and handling capabilities.
The basic job of the clutch is to temporarily disconnect the engine from the transmission and drivetrain system which drives the rear wheel. Unless that happens, it is nearly impossible to mate an idling engine with the transmission and move a geared motorcycle, which is at a standstill, forwards. It is possible to shift gears without the clutch when the bike is moving, but the result isn't always smooth and if performed incorrectly, the grinding can even damage the gearbox for good.
The lever which is pulled by your left hand is connected to a circular clutch assembly, which sits closer to the engine, via a cable or a hydraulic system. The assembly consists of a pressure plate on the outermost side which faces the engine cover. As the name suggests, with the help of springs which are bolted on the outside, the pressure plate acts like a lid which pushes in and pulls out to compress and decompress the “Clutch Pack“. This pack consists of a series of friction and steel plates which are placed alternately and have teeth around their outer and inner circumference respectively.
These plates are closely stacked together, where the teeth of the friction plates interlock with the slots grooves on an outer basket covering the width of the entire assembly. The steel plates which are placed between the friction plates interlock against the grooves on a smaller inner hub, which has a smaller diameter than the outer basket and is placed inside, adjacent to it.
The outer basket is lined with toothy gears along its circumference, which is connected to and driven by the engine's crankshaft. The inner hub is splined on the transmission's input shaft and rotates along with it. When the clutch lever is out, the fully compressed springs on the pressure plate sandwich everything together. As the steel and friction plates are pressing against each other at this time, the rotation of the friction disc results in rotation of the steel disc and vice-versa. As a result, power is transferred from the engine to the transmission.
When you pull the clutch lever in, the action causes the compressed springs on the pressure plate to retract. As a result, the friction and steel plates which are forced together separate and begin to rotate independently, disconnecting the engine from the transmission system. If you've ever experienced that the clutch lever is hard to pull in on some motorcycles, it is because the pressure acting on the external plate is increased to enhance the clutch's ability to handle engine power. It is one of the alternatives to using a smaller clutch assembly with many plates or a larger assembly with fewer plates.
There are two main designs of motorcycle clutch assemblies – A wet clutch and a dry clutch. A wet clutch is bathed in the engine oil, as it provides cooling and lubricates the various interlocking components of the assembly. It has a longer life and can withstand harsh conditions better, in comparison to a dry system. A dry clutch as the name suggests doesn't require an oil bath. The upside to that? It doesn't contaminate the engine oil with particles which are a part of normal wear and tear of the clutch system. The other advantage is that since it doesn't spin through an oil bath which also lubricates the engine, there is lesser drag and the system doesn't rob the engine's power.
Components of the Motorcycle Driven Clutch
A clutch basket is a rotating cylinder that houses the entire gear assembly. Made up of strong metals like steel, the clutch basket spins constantly with the engine's revolutions when it is engaged with the help of teeth like structures on its outer surface.
Users use the clutch lever to shift gears. Located at the left side of the handlebar on your motorcycle, the clutch lever allows you to give inputs to the clutch assembly through the clutch cable.
There are two types of clutch plates:
Friction Plate: Friction plates are flat disc parts of the clutch system to help grip steel plates firmly. Usually made from fibre-based materials, friction plates are placed in alternate positions with steel plates. They are also known as drive plates.
Steel Plates: These are also flat discs that transmit rotational force from the engine to the transmission. They are smooth and metallic discs of high-quality, durable steel, also known as driven plates.
These plates are crucial for the engagement and disengagement of the clutch system. When you pull the clutch lever, the pressure plate causes the disengagement of the clutch plates (friction and steel plates) and temporarily disrupts the transmission of power from the motorcycle engine.
This cable connects the clutch lever at the motorcycle handle to the clutch assembly near the engine.
How to Maintain Motorcycle Driven Clutch
Importance of Clutch Maintenance
Smooth Gear Changes: A well-maintained clutch ensures seamless gear shifting, contributing to a smoother and more enjoyable riding experience.
Extended Lifespan: Proper care prevents premature wear of clutch components, reducing the need for frequent replacements.
Improved Performance: Maintaining the clutch system enhances the motorcycle's overall performance and responsiveness.
Common Clutch Issues
● Slipping Clutch:
Symptoms: Engine revving without power transfer to the wheels, difficulty accelerating.
Cause: Worn-out clutch plates or springs.
Solution: Replace worn clutch plates or springs to restore proper grip.
● Clutch Dragging
Symptoms: Difficulty shifting gears, jerky or abrupt engagement.
Cause: Improper clutch cable adjustment or contaminated/friction-worn plates.
Solution: Adjust the clutch cable to the manufacturer's specifications. Clean or replace clutch plates if necessary.
● Clutch Noise
Symptoms: Unusual noises like rattling or grinding during clutch engagement.
Cause: Worn bearings or improperly lubricated components.
Solution: Replace worn bearings and ensure proper lubrication of clutch components.
● Clutch Fluid Leaks
Symptoms: Loss of clutch control, reduced clutch engagement.
Cause: Damaged seals, gaskets, or hydraulic lines.
Solution: Identify and repair leaks. Replace damaged seals or lines in the hydraulic clutch system.
Clutch Maintenance Procedures
Clutch Cable Inspection: Ensure proper tension and adjust if necessary to achieve the correct slack.
Clutch Plate Inspection: Check for wear, glazing, or contamination on the clutch plates. Replace if needed.
Hydraulic Clutch Fluid Inspection: Check fluid levels and condition. Top up or replace contaminated fluid as recommended by the manufacturer.
Clutch Adjustment: Adjust the clutch engagement point and free play according to the manufacturer's specifications.
Preventive Measures
Regular Inspection: Routinely check clutch cable tension, fluid levels, and clutch engagement for any abnormalities.
Proper Riding Technique: Avoid excessive clutch slipping during gear changes or prolonged holding of the clutch lever, as it accelerates wear.
Quality Replacement Parts: Use high-quality clutch components from reputable manufacturers for replacements and repairs.