Motorcycle timing chain

Types of Motocycle Timing Chain

A motorcycle timing chain is an important component that helps to synchronize the rotation of the crankshaft and camshaft for timed valve operation. There are several types of timing chains, including:

• Roller Timing Chain

  Roller timing chains, also known as pitch chains, are popular in most motorcycles. They have cylindrical rollers on the link's ends. These rollers reduce friction with the sprockets and extend the chain's longevity. The chains come in various sizes and are measured by pitch, which is the distance between the centers of two rollers.

• Silent Timing Chain

  These chains are designed to be less noisy than other types. They achieve this by having an involute tooth shape that eliminates any contact between the chain and the guide. As a result, there is no wear, and the chain lasts longer. Silent timing chains are mainly used in internal combustion engines.

• Double Roller Timing Chain

  The double roller timing chain is an improvement over the single roller timing chain. As the name suggests, it has double rollers at each link. The two rollers fit side by side on the sprocket wheels. These chains provide a larger surface area for better power transmission and a more secure fit on the sprockets. As a result, double roller timing chains are more efficient and suitable for high-performance motorcycles.

• Triple Roller Timing Chain

  Triple roller timing chains are used in high-performance and racing motorcycles. The chains have three rollers at each link. The triple roller timing chain increases the contact area with the sprockets, making them suitable for handling extreme loads and high speeds. Because of their durability and strength, triple roller timing chains are mainly used in motorcycles with upgraded engines.

• Hypercut Timing Chain

  Hypercut timing chains are designed for specific needs. For instance, they have a special pitch or tooth form that maximizes efficiency and minimizes wear, making them suitable for electric motorcycles. These chains are also optimized for low-noise operation.

Specifications and maintenance of motorcycle timing chains

Timing chains are essential components of the timing system in an internal combustion engine. They are used to keep the crankshaft and camshaft in sync. This ensures that the engine's valves open and close at the right time as the piston moves up and down. This is important for optimal engine performance and efficiency and helps prevent valve-piston collisions. The specification of timing chains is important for the proper function of the engine. Here are some of the key specifications of timing chains.

• Length

  Timing chains are available in different lengths. This is because different engine designs require chains of varying lengths. The length of the chain is measured from pin center to chain pin center. The timing chain must be the correct length for the engine to function properly.

• Pitch

  The timing chain pitch is the distance between the center of the chain pins. It is an important specification because it affects the fit of the chain on the sprockets. The timing chain pitch is available in different sizes, depending on the engine design.

• Number of links

  The number of links in a timing chain varies according to the engine design. More complex engines with more cylinders and larger displacements require chains with more links. The number of links in the chain affects its length and tensioning requirements.

• Material

  Timing chains are made from different materials, including steel and other alloys. The material affects the chain's strength and durability. For instance, chains made of high-carbon steel offer better wear resistance and tensile strength. This makes them suitable for high-performance engines.

• Tensile strength

  Tensile strength is an important specification of timing chains. It is the maximum stress the chain can withstand before breaking. Timing chains are subjected to high tension in the engine. Therefore, they must have a high tensile strength to prevent failure.

Like every other part of the motorcycle, timing chains also require proper maintenance to function properly and last longer. Here are some tips for maintaining timing chains.

• 1. Regular Inspection

  Inspect the timing chain during routine maintenance. Look for signs of wear, rust, or damage. Check for chain elongation and ensure the links are not stiff.

• 2. Proper Lubrication

  Use the manufacturer's recommended lubricant to oil the timing chain. This reduces friction and prevents rust. Avoid using too much lubricant, as this can attract dirt and debris.

• 3. Chain Tensioning

  Ensure the timing chain is properly tense. A loose chain can skip on the sprockets or snap. On the other hand, a too-tight chain can stretch or damage over time.

• 4. Use Quality Replacement Chains

  If the timing chain needs replacement, use a high-quality chain that meets the manufacturer's specifications. Avoid using cheap, generic chains, as they may not fit properly or last long.

• 5. Professional Installation

  If the timing chain needs replacement, use a high-quality chain that meets the manufacturer's specifications. Avoid using cheap, generic chains, as they may not fit properly or last long.

• 6. Avoid Heavy Loads

  Avoid overloading the motorcycle. Carrying heavy loads can put extra stress on the timing chain and other engine components. This can cause the chain to wear out faster.

• 7. Avoid High RPMs

  Avoid revving the engine to high RPMs, especially when cold. High RPMs put more stress on the timing chain and other engine components, which can cause premature wear.

How to Choose Motocycle Timing Chain

When selecting a motorcycle timing chain, consider the following:

• Chain size: The size of the timing chain must be compatible with the motorcycle's engine design. Larger chains are used in high-performance engines, while smaller chains are used in smaller or less powerful engines. The chain must be the correct size to ensure proper timing and avoid slippage or breakage.
• Strength and durability: High-quality materials such as hardened steel offer strength and resistance to wear, making them ideal for demanding conditions. Consider the expected load and stress levels in the timing chain. A chain with a higher load capacity is needed for heavy bikes or those carrying loads. The chain must withstand the tensile strength and fatigue resistance to avoid failure.
• Type of chain: Roller chains are the most common type used in motorcycles. However, other types such as silent chains or hexagonal chains may be suitable for specific engine designs. Each type has advantages and disadvantages in terms of performance, maintenance requirements, and noise levels. Roller chains are popular because they offer a good balance of strength, durability, and smooth operation.
• Maintenance requirements: Some timing chains require periodic lubrication or tension adjustment to maintain optimal performance. Consider the maintenance schedule and accessibility of the chain and associated components. Choose chains that match the desired level of maintenance and care. Also, consider the availability of replacement parts and tools needed for DIY maintenance.
• Brand and supplier: Reputable brands offer quality chains and components with consistent performance and durability. Look for reviews and recommendations from other motorcycle owners or mechanics. Choose reliable suppliers who provide quality assurance and after-sales support.

How to DIY and Replace Motocycle Timing Chain

Replacing a timing chain can be a challenging task, but with the right tools and basic mechanical knowledge, it can be done. Here is a general guide on how to replace a motorcycle timing chain:

• Tools and Materials Needed

  New timing chain and timing chain guides (if required), Socket set, Torque wrench, Screwdrivers, Pliers, Timing chain tensioner tool, Motorcycle repair manual (specific to the make and model).

• Preparation

  Ensure the motorcycle is on a stable, level surface. Disconnect the battery, drain the coolant (if applicable), and drain the engine oil. Refer to the repair manual for specific instructions related to the make and model of the motorcycle.

• Access the Timing Chain

  Remove any necessary components to access the timing chain. This usually includes the side cover of the engine where the timing chain is located, the exhaust system, and the intake system. Refer to the manual for disassembly instructions.

• Set the Engine to Top Dead Center (TDC)

  Rotate the crankshaft using a socket and ratchet until the engine is at TDC for the cylinder being timed. This is usually indicated by a marking on the crankshaft pulley and a corresponding mark on the crankcase. Ensure the marks align accurately.

• Remove the Old Timing Chain

  Use the timing chain tensioner tool to relieve tension on the chain. Carefully remove the timing chain tensioner and guides. Take note of the chain routing and guide placement. Remove the timing chain from the sprockets.

• Install the New Timing Chain

  Lubricate the new timing chain with clean engine oil. Install the new chain, ensuring it follows the correct routing. Install the timing chain guides and tensioner to the chain.

• Adjust Chain Tension

  Follow the manufacturer's instructions to set the correct tension on the new chain. This usually involves extending the tensioner to a specified length and then installing it.

• Reassemble

  Reattach the side cover, exhaust system, and intake system. Reconnect the battery and refill the engine with oil. Start the engine and listen for any unusual noises. Ensure the timing chain operates smoothly.

Q&A

Q1. What is the best timing chain for motorcycles?

A1. There is no specific answer to this question as the best timing chain is one that is compatible with the specific make and model of the motorcycle. However, buyers can find chains with superior quality in the market. They are made of durable materials and have received positive reviews from past buyers.

Q2. How do buyers know when to replace a timing chain?

A2. The replacement of timing chains is mostly proactive before any serious damage occurs to the engine. However, if the motorcycle timing chain has stretched and is causing problems with the timing of the engine, or if it has damaged other components, such as the guide rails or the timing cover, it should be replaced. Signs of damage to the chain include ticking noises from the engine, vibration during running, or a check engine light. Replacing the chain can prevent these issues, saving on costs.

Q3. What other components should be replaced during a timing chain replacement?

A3. Buyers are advised to replace the timing chain guide, timing chain tensioner, and water pump when doing a timing chain replacement. This is because these components work in unison with the timing chain and will ensure proper timing and function of the engine, thus saving on costs and time.

Q4. Can buyers find timing chains for old models of motorcycles?

A4. Yes, buyers can find timing chains for old models of motorcycles. However, they might have to search for a longer time or contact suppliers for assistance. They might also need to purchase the chains from specialized suppliers.

Q5. Can anyone replace a timing chain, or does it have to be done by a professional?

A5. While it is possible for anyone to replace a timing chain on a motorcycle, it requires knowledge of engine mechanics and precise timing adjustments. Thus, it is advisable that the replacement be done by a professional mechanic.