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Motorcycle Engine Valve

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Your Professional Motorcycle Engine Valve Manufacturer in China!

Moyada specializes in producing valve, clutch, main and auxiliary shafts, cams, electrical parts, cylinder, bearings and other motorcycle gear accessories. The company established a sales platform based on the integration of production enterprises, and adopted the mode of factory focus on production and platform professional sales to meet all kinds of customer needs.

Wide Product Range

We offer a variety of motorcycles engine parts, including valve, clutch, main and auxiliary shafts, cams, electrical parts, cylinder, bearings and other motorcycle gear accessories.

Professional Certificate

Certificate of ISO, TS16949 management system, and Environmental Management System Certificate all reflect the professionalism of our products. Reliable after-sales service ensures that customers can purchase products with confidence.

Rich Experience

We have more than 20 years of experience in quality, production and supply chain management, and can continue to provide customers with satisfactory products and services.

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We will arrange production and shipment according to the customer's schedule and order urgency, and deliver on time. The fast shipping system allows customers to receive products quickly.

 

 

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Brief Introduction to Motorcycle Engine Valve

 

A motorcycle engine valve is a component that regulates fuel and airflow in the combustion chamber. Valves act as the doors to the combustion chamber. Valves are important in internal combustion engines. They affect engine performance parameters like: Power, Torque, Fuel consumption, Engine emissions. Valves can perform the function of either inlet or an outlet, depending on the position of a piston during the combustion cycle.

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The Role of Motorcycle Engine Valves

 

In motorcycles, a valve is an engine component that helps regulate fuel and airflow throughout the combustion chamber. A motorcycle engine typically has two types of valves: Intake Valves and Exhaust Valves.

The intake valve opens to allow air and fuel to enter the combustion chamber. Meanwhile, the exhaust valve opens to allow exhaust gases to exit the combustion chamber after combustion is complete. These valves operate on a camshaft synchronized with the rotation of the engine's crankshaft.

The valves must be adjusted to ensure that they open and close at the correct intervals, ensuring the engine operates efficiently. If the valves are not adjusted properly, they may not open and close fully, leading to reduced engine performance and power.

The valves also play a role in braking. When the throttle is closed, the intake valves close and the engine's momentum causes the pistons to compress the air and fuel mixture. This compression creates resistance that causes the motorcycle to slow down. 

What is the Function of Motorcycle Engine Valve?

 

Engine valves are essential parts of a motorcycle engine as these valves control the passage of air and fuel in and out of the cylinder as air is vital for combustion. They also help in exhausting the smoke and fumes that are produced as a result of combustion.

You can also successfully monitor the combustion activity and efficiency of the cylinders if you keep your engine valves under control. In addition, you should also regularly adjust engine valves to avoid serious and costly problems.

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Benefits of Properly Adjusted Engine Valves for Motorcycle Performance
 

Increased Power

Properly adjusted valves can increase engine power and performance since they ensure maximum air and fuel flow into the engine.

01

Better Fuel Efficiency

When the valves are properly adjusted, the engine runs more efficiently and has better fuel economy and reduced emissions.

Smoother Idle

Properly adjusted valves can lead to smoother idle and overall engine operation.

02

Reduced Engine Noise

Properly adjusted valves can reduce engine noise and vibrations, providing a more comfortable ride.

03

Extended Engine Life

Neglecting valve adjustment can cause engine damage, such as bent valves or broken camshafts. By properly adjusting the valves, you can extend the engine's lifespan.

04

Better Engine Braking

Properly adjusted valves can improve engine braking by ensuring the correct intake and release of air and fuel during deceleration.

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How to Inspect the Engine Valve Clearance for Motorcycle?

 

 
STEP 1: Make Way to the Valve Cover

Remove all the necessary parts including cables and wiring so that you'll get free access to the valve cover. Blast everything with compressed air to make sure everything is nice and clean which also includes the spark plug hole.

 
STEP 2: Remove Valve Cover

Remove all the necessary bolts holding the valve cover in place. Once that has been done, slowly pull it out making sure not to hit the cam timing gears. It's a bit difficult as most bikes have a tight fit but it can be done with a bit of patience and elbow grease. Don't forget to remove the head gasket as well.

 
STEP 3: Set the Pistons to Top Dead Centre (TDC)

Top dead centre (TDC) is basically the point in the combustion cycle where none of the cams are applying any sort of pressure on the valves. To do this, just rotate the engine by moving the crank. You will need to remove the inspection plugs in order to do so.

 
STEP 4: Check the Clearances

The valve clearance generally points to the gap between the cam (or rocker) and the valve bucket. In order for you to this successfully, you'll need some feeler gauges. Determine the clearance using trial and error by seeing which gauges can slip under the cam freely. Record the valve clearance for all valves on a piece of paper. If the clearances are within tolerance, then you're good to go. If not, proceed to the next few steps.

 
STEP 5 : Loosen the Timing Chain

If your valve clearances are outside of the preferred tolerances set by your bike's manufacturer, you'll need to change the shims on the valves. To remove the cams to access the buckets and shims, you'll need to loosen the timing chain. Most bikes run automatic cam-chain tensioners. Simply remove the covering bolt, and then use a screwdriver to unscrew the tensioner until you feel a click and the chain becomes loose.

 
STEP 6: Remove the Cam/s

This step requires some careful manoeuvres but with the right knowledge, anything can be done. To remove the camshafts, which is necessary to access the valves that are out of spec, the first step is to remove the journal holder. Undo the bolts in the order recommended by your manufacturer to prevent the holder from warping. Two dowel pins keep the cam and journal holder aligned, so make sure you take care to grab them (or they can easily fall down into the engine).

 
STEP 7: Get a Hold of Your Timing Chain

If there's only a need to adjust the valves under just one camshaft, simply hold the timing chain in place with a cable tie without having to remove the cams. if it requires you to remove the cams, use a screwdriver to make sure that it won't fall down into the engine's casing.

 
STEP 8: Remove Buckets

With great care, remove the buckets from the top of the valves using a pair of long-nosed pliers. Proceed with caution as to avoid any damages to the buckets. Having a magnet in your hand will make it easier to hold on to to avoid any drops. Place them together with the shims and note down on which valve they came from.

 
STEP 9: Measure Valve Clearance Shims

This step requires a set of vernier calipers as you need to measure the shims in order to adjust the valves accordingly. Make sure you have the recommended measurements according to your bike's manufacturer.

 
STEP 10: Get All Parts Reassembled Again

Once you've got the correct shims in place, it's time to reinstall the shims, buckets, cam, journal holder, timing chain and valve cover. Make sure you keep the timing chain taught and install it on the correct cam teeth, following your manufacturer's instructions, so you don't get the bike's timing wrong. Also use the recommended specs for tightening the journal holder.

 

 

Our Certificate

 

 ISO and TS16949 Management System Certification

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Company Equipment

 

Advanced Equipment

 

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Common Problems of Motorcycle Engine Valve

 

Q: Why do you need to get the valve clearances adjusted?

A: As most of already know, motorcycle engines tend to run at a higher temperature due to its higher revs in a compact sizing. When things get hot, they expand and without proper clearances to accommodate for the expansion, things will get bad fast. That's why engines have clearances between the cams and valves to help out with the longevity of the engine.

Getting the right amount of clearance is the key to a smooth performing engine. If the gap is too big, you'll end up with a lot of valve-train noise. If the gap is too small or if there's no gap at all, the valves won't seat fully in their optimum positions. This is the usual case that occurs to most motorcycles after going through some miles (anywhere between 4,000km to 26,000km).

Getting the clearance adjusted is crucial not only for great performance but also to avoid any unwanted catastrophic failures or engine blows. If you continue to run the bike with little to no gap on the valve clearance, super hot exhaust gases can escape properly which in turn will burn the valves and cause a major dent to your wallet.

Q: How do I know if my motorcycle valves need adjustment?

A: Noise is the biggest one. When the valve train is sloppy, you can hear the parts all slapping off each other. Poor performance is another. When the valve train is too tight, the valves won't close properly and the engine won't be able to run at peak.

Q: Can you do a valve adjustment yourself?

A: Adjusting valve lash is one of the simplest jobs you can do to your engine. Yeah, it looks all dark and scary under that rocker arm cover, but trust us, this is easier, cleaner and less environmentally damaging than an oil change.

Q: How do I know if my valves need adjusting?

A: If your engine generates a loud clatter, it could be time for a valve clearance adjustment, though a tapping noise could also be caused by a loose rocker arm or some other component; the mechanic won't know for sure without inspecting the valves.

Q: Why do valves need to be adjusted on motorcycle?

A: The valves must be adjusted to ensure that they open and close at the correct intervals, ensuring the engine operates efficiently. If the valves are not adjusted properly, they may not open and close fully, leading to reduced engine performance and power.

Q: What happens if you don't adjust motorcycle valves?

A: Eventually, the valves are unable to close fully making a seal inside the combustion chamber impossible. This can lead to poor gas mileage, rough running, difficulty starting, and, if left for too long, can cause the engine to not run at all.

Q: What is the valve timing on a motorcycle?

A: Valve timing is an important design parameter which affects many engine performance parameters like specific fuel consumption, engine emission and others. The intake and exhaust valves must open and close at the right time.

Q: What is the problem with the valves on a motorcycle?

A: One indication that an engine might be due for a valve job is oil puffing through the exhaust when the throttle is closed and the engine is revving down, indicating that the valve guides are worn and oil is seeping between the stem and guide when engine vacuum is high.

Q: What does 4 valves mean in motorcycle?

A: A four-valve setup is more commonly used on modern bikes or performance motorcycles. The configuration comprises of two large intake valves and two small exhaust valves. Generally, a four valve engine requires a DOHC (Double Overhead Camshaft) or two cams setup.

Q: What is the function of the valve in a motorcycle?

A: Essentially, valves act as the doors to the combustion chamber, allowing the fresh mix to flow in during the intake stroke, sealing the chamber during the compression and power strokes, and providing an exit for the spent gas during the exhaust stroke.

Q: What is the importance of engine valve?

A: The engine valve's primary function is to allow air into and out of the cylinder. Air is used to assist in the ignition of the fuel, which pushes the pistons up and down. Engine valves are classified into two types: intake valves and exhaust valves.

Q: What is the major function of valves in engine?

A: Engine valves are mechanical components used in internal combustion engines to allow or restrict the flow of fluid or gas to and from the combustion chambers or cylinders during engine operation.

Q: How important is valve adjustment on motorcycle?

A: This has a direct effect on engine performance. Reliability is also affected by valve clearance. If it's too great, it will cause adjoining parts to slam into each other – hence the tapping noise you hear on bikes that haven't been properly maintained. This pounding will wear out valve train parts prematurely.

Q: What type of valve is on a motorcycle?

A: All motorcycle poppet valves are shaped like a 4-inch nail with a big flat head. In modern bikes the valve's head (called the face) sits in the combustion chamber with the shaft (called the stem) poking up out of the cylinder, where it is attached to a spring.

Q: Which material is used for engine valve?

A: Inlet Engine Valves are made from Chrome Silicon Alloy Steel and Exhaust Engine Valves are made from Chrome Nickel Silicon Alloy Steel (to operate under high temperature and high stress conditions).

Q: What is the problem with the valves on a motorcycle?

A: One indication that an engine might be due for a valve job is oil puffing through the exhaust when the throttle is closed and the engine is revving down, indicating that the valve guides are worn and oil is seeping between the stem and guide when engine vacuum is high.

Q: Do motorcycle engines have valves?

A: For example, a 4-stroke engine can have two or four valves. If there are just two valves, one is used for intake and the other is used for exhaust. However, if there are four valves, two are used for intake and two are used for exhaust. The internal workings of a bike might not be very relevant for all bike owners.

Q: How are engine valves made?

A: The valve is made in two parts and then welded together. The head typically being made form stainless steel, and the stem from high carbon steel. Valves are mostly made from hardened steel, or more exotic materials such as titanium in high performance engines.

Q: How many valves does an engine have?

A: A multi-valve engine design has three, four, or five valves per cylinder to achieve improved performance. Any four-stroke internal combustion engine needs at least two valves per cylinder: one for intake of air (and often fuel), and another for exhaust of combustion gases.

Q: What is the best engine valve material?

A: Titanium Valves. Titanium offers the highest strength-to-weight ratio of any known metal. In an unalloyed condition, titanium is as strong as some steel materials but about 45% lighter.

 

 

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