Symptoms of a dying motorcycle clutch

The clutch is one of the most vital components of a two-wheeler, and a clutch plate tends to be it most crucial component. Basically, a clutch is a mechanical device that sits between the engine and the gearbox and is responsible for engaging or disengaging the engine’s drive to the transmission.

The major components of a clutch assembly include: -
• Flywheel
• Pressure plate
• Clutch friction disc
• Clutch release bearing

We have already explained the workings of a bike clutch plate and how the clutch system functions overall in one of our previous articles. To recap, the flywheel is driven by the engine, while the pressure plate holds the friction plates tightly against it. When the clutch lever is released, the drive is transmitted to the rear wheel since the entire assembly acts as a single unit. When the clutch lever is pressed, the friction plates are separated from the flywheel; here, the drive is not transmitted to the rear wheel and allows you to make a gear shift.

Motorcycle clutches are of two types: –
• Wet clutch
• Dry clutch

In a wet clutch transmission, the clutches are bathed in engine oil for heat dissipation and lubrication and are located inside the engine casing. It is a multi-plate assembly and is used in high torque applications as the lubricant (or oil) dissipates the heat arising from the friction between the plates. The wear and tear and maintenance are relatively low although, due to lubrication, the torque transmitting capacity is slightly reduced.
On the other hand, dry clutches are not bathed in engine oil and hence located outside the engine casing, in direct contact with the atmosphere. Now, with the knowledge that your motorcycle clutch would most likely be a wet multi-plate unit, let us take a look at symptoms of a dying clutch in bikes: -

⮚ Clutch slippage

Clutch slippage is a problem in bike/ car clutch plates wherein these plates cannot hold the friction plates against the flywheel tightly as required, resulting in an erratic transfer of power. Over time, the friction plates lose their quality to provide sufficient friction, owing to excessive heat and wear and tear. They are not able to hold together very well, resulting in slippage.
This also means that the flywheel and pressure plate are locked, but are still rotating at different speeds. In essence, this means that the engine's power is not perfectly transferred to the rear wheel. You can feel this happening when you whack open the throttle, the engine revs shoot up, but your motorcycle does not accelerate as it should correspond with your throttle input.
The clutch is a robust and heavy assembly, and that is why the clutch lever is generally quite firm and resistive, especially if the clutch assembly is not a slipper-and-assist type. If your clutch lever becomes soft like wool, it might be a sign of a worn-out clutch. Also, if the consistency of operation, the smoothness of engaging clutch, shifting gears etc., is erratic, you might want to visit your service centre. In extreme cases, even when you release the clutch lever, the lever still stays pressed in.

⮚ Unusual pulsations and vibrations

Sound is an excellent indicator of the health of any vehicle. If you hear your clutch rattling, pulsating, clinging or making unusual noises or if you feel something is grinding underneath, this might indicate a worn-out clutch. When you feel excessive vibrations or pulsations upon operating the clutch or changing gears or feel an excessive shuddering of the motorcycle, especially when you start to drive off or release the clutch after a shift, you need to have your clutch examined.

⮚ Noise / Difficulty in Gear Shift

Gear shifts are directly related to the clutch so quite naturally if the clutch is worn out, the shifts will be unusual. A worn-out clutch will result in a jerky and very unpredictable gear shift. If you experience A. false neutrals quite often, B. hear grinding and squeaking when you shift, C. if the in-gear acceleration is not what it used to be, D. if some gears feel particularly easy to engage while some feel particularly difficult, it is time to check the health of your clutch.

⮚ Burning Smell

Even a slight burning smell of rubber is a key indication that your clutch plates are under immense pressure. It is usually a sign of clutch overheating as the exterior compound on each plate (ceramic, brass fivers or steel) is rubbing against each other extensively. This usually happens in scenarios of constant gear shifts in slow moving traffic which impacts the clutch plate.

Lower mileage

Another sign of a worn-out clutch is reduced fuel efficiency. A worn-out clutch means that the engine is not able to transmit its power correctly to the gearbox. This would result in lower acceleration and speed for any given increase in engine speed, resulting in lower mileage. If your motorcycle’s mileage has dropped along with a drop in performance, it is time to have those plates checked.

Now, apart from the symptoms, we would also like to share a few tips to increase your clutch's life.

Here are a few tips to ensure your transmission remains healthy.

• Don’t ride the clutch

A habit of riding the clutch, or in other words, keeping the clutch lever partially pressed at most times affects the life of the clutch. Riding the clutch over a prolonged period wears out the clutch assembly components prematurely. Use the clutch only when you have to shift gears, make a clean shift and release the clutch lever once done to ensure the longevity of your motorcycle’s clutch. Riding on the clutch puts intense pressure on plates as they have to rub against each other extensively for load carrying, which ultimately hampers the long-term health of the gearbox.

• Try Rev-match

To avoid a sudden shoot up of the revs after a downshift, you should slightly blip the throttle before releasing the clutch to shoot the engine revs up and match the revs for the downshift for the desired lower gear. Motorcycles with a slipper clutch overcome this problem, but if yours doesn’t have one, ensure that you blip the throttle and rev-match to minimise the damage caused.

Avoid unnecessary, overly aggressive downshifts

As an extension of the above point, you should avoid downshifting aggressively when it is not necessary. Some riders have this habit of shifting down a couple of gears when it is not needed, purely for the noise and its drama. Sure, if you are riding fast you will sometimes need to downshift aggressively, especially around sharper corners.
However, always remember that smoothness, not theatrics are key to being fast. You should try to be smooth and be in the right gear rather than put the engine and clutch under pressure for no real gains.

To sum it all up, the clutch is one of the most vital components of your motorcycle. It is usually designed to last for a very long time, but if you don’t take the necessary care, it will wear out sooner than expected. Drive responsibly and safeguard your clutch to get optimal performance and fuel efficiency from your motorcycle in the long term. In case your TVS Motor two-wheeler faces any mechanical issue.

TVS Motor service center locator will help you navigate to the nearest possible service station for your vehicle checkup.

Also Read:

Aquaplaning: What Is It, and How To Avoid It On A Two-Wheeler

How To Care For Your Two-Wheeler Battery