How to Adjust Your Motorcycle Clutch Lever's Free Play! Explanation of Necessity and When to Replace

Two Types of Motorcycle Clutches

Source: https://pixabay.com/ja/photos/AF-422698/

Clutches are essential for manual motorcycles, and they are broadly divided into two types: cable-operated and hydraulic.

Cable-operated clutches require adjustment, but let's take a look at what kind of clutch each is.

Cable-Operated Clutch

A cable-operated clutch is a type of clutch that operates through a cable extending from the clutch lever.

When operating the clutch, the cable is pulled to engage the clutch. Since the clutch is operated directly by the cable, there is a direct feel to the operation.

Additionally, since cables can deteriorate or rust, maintenance and replacement of the cable are necessary.

Hydraulic Clutch

A hydraulic clutch is a type of clutch that operates via hydraulic pressure. It was implemented for maintenance-free operation, so it doesn't require maintenance like a cable-operated clutch.

Play adjustment is also basically done automatically, but compared to cable-operated clutches, there is less direct feel during operation, and it feels like there's a slight delay when operating the clutch.

While the clutch itself doesn't require maintenance or adjustment, the hydraulic fluid can deteriorate over time or with use, leading to air in the system or rust, so it needs to be replaced.

What is clutch free play on a motorcycle?

Source: https://pixabay.com/ja/photos/93-4187586/

Clutch free play on a motorcycle refers to the distance the clutch lever moves before the clutch begins to engage.

There is an appropriate amount (range) of clutch free play. If there is no free play, half-clutching becomes difficult, making it easier to stall. Conversely, if there is too much free play, the clutch may not disengage even when operated, leading to problems.

Optimal amount of free play

The optimal amount of free play for a motorcycle clutch is in the range of 10mm to 20mm from the initial pull of the clutch lever.

Adjust the free play so that the clutch is in the half-clutch state between 10mm and 20mm from the initial pull. If there is too little or too much free play, clutch operation becomes difficult.

Also, free play adjustment can only be done on cable-operated clutches. Hydraulic clutches automatically adjust the free play using hydraulic fluid, so no adjustment is needed.

What happens if you don't adjust your motorcycle clutch?

Source: https://pixabay.com/ja/photos/81%93-1839003/

Neglecting motorcycle clutch adjustment can lead to various problems.

The symptoms that occur when clutch adjustment is neglected are as follows:

1. Clutch doesn't disengage
2. Difficulty shifting into neutral
3. Clutch slips during acceleration

Symptom 1: Clutch doesn't disengage

If there is too much free play in the motorcycle clutch, the clutch may not disengage even when the clutch lever is pulled.

If you engage a gear without the clutch fully disengaging, it can put a strain on the transmission and the clutch, potentially leading to damage.

If the clutch is not disengaging properly, check if the clutch free play is at the appropriate amount, and if there is too much free play, adjust it to the correct amount.

Furthermore, both too much and too little free play can negatively affect the clutch, so it must be adjusted to the appropriate amount.

Symptom 2: Difficulty shifting into neutral

If there is too much free play in the clutch, the clutch will not disengage properly, making it difficult to shift into neutral.

If you feel that it's hard to shift into neutral, check if the clutch free play is set correctly.

Symptom 3: Clutch slips during acceleration

If the clutch slips during acceleration (the bike doesn't accelerate despite increasing engine RPMs), it's possible that the clutch free play is not set correctly.

If there's almost no free play, the clutch will be in a constant state of half-engagement even when released, preventing proper acceleration despite increasing engine RPMs.

Furthermore, being in a constant state of half-clutch means the clutch plates are always in contact and wearing down, leading to rapid wear and, in the worst case, clutch burning.

How to adjust a cable-operated clutch

Source: https://pixabay.com/ja/photos/81-7381713/

Due to the nature of the material, cable-operated clutches' cables stretch, so periodic free play adjustment is necessary.

Free play adjustment for cable-operated clutches can be done in two places: fine adjustment at the clutch lever side and main adjustment at the clutch side. First, perform fine adjustment at the handlebar side, and if the free play doesn't become appropriate, perform main adjustment at the clutch side.

Fine adjustment method (clutch lever side)

You can fine-tune the free play by turning the adjuster at the base of the clutch lever.

For fine adjustment, peel back the rubber cover that covers the base of the clutch lever, loosen the disc-shaped lock nut, and then the adjacent adjuster can be adjusted.

If the lock nut or adjuster is stiff and difficult to turn, use pliers to grip the serrated edge and turn it, or place a flathead screwdriver on the notched part and gently tap it to loosen it.

Main adjustment method (clutch side)

If the fine adjustment at the clutch lever side doesn't result in appropriate free play, perform the main adjustment at the clutch side.

Following the clutch cable, you'll find a section near the clutch secured by two nuts, and these nuts allow for adjustment.

The nut on the clutch lever side is a lock nut, so by loosening the lock nut, you can adjust with the nut on the clutch side (engine side).

In the case of a hydraulic clutch

Hydraulic clutches do not require free play adjustment like cable-operated clutches.

Since the clutch lever's position and angle affect how easily force can be applied and how comfortable it is to grip, adjust the clutch lever to a position and angle where force can be applied easily.

While hydraulic systems don't require fine adjustments, clutch fluid is a consumable that degrades. Therefore, it should be replaced approximately every 5 years or 50,000 km from when the bike was new or the last replacement.

If the adjustment does not result in the proper amount

If the free play adjustment does not result in the proper amount, or if there is rust or resistance when pulling the cable, it is time to replace the clutch cable. Replace it with a new cable.

Clutch cables are also consumables and stretch over time due to the nature of their material, so if adjustment no longer provides the correct free play, replacement is necessary.

Additionally, if there is rust, excessive dirt, or fraying, it should be promptly replaced before it breaks.

When should I replace my motorcycle clutch?

Source: https://pixabay.com/ja/photos/AF-825754/

The clutch plates on a motorcycle are consumables, so they need to be replaced periodically.

The timing for clutch replacement varies greatly depending on the rider (and riding style), making it difficult to simply use mileage as a guide, unlike engine oil changes.

Clutch replacement目安

Motorcycle clutch replacement varies greatly depending on riding style. For those who frequently use the half-clutch, clutch plate wear progresses faster, leading to a shorter replacement cycle.

Riders who are not good at clutch engagement might experience clutch slip around 3,000 km from new or the last replacement, while those who can ride in a way that preserves the clutch might have their clutch last over 10,000 km.

This is when clutch slip becomes severe (the engine revs but doesn't accelerate proportionally) or when you can no longer achieve the correct amount of clutch free play even after adjustment.

Estimated clutch replacement cost

The estimated cost for motorcycle clutch replacement varies from around 12,000 to 30,000 yen for clutch plates, depending on the model. For motorcycles with fairings, an additional 1,000 to 2,000 yen may be added for fairing removal and reinstallation.

Replacing only the clutch cable costs approximately 2,000 to 6,000 yen, and replacing the clutch fluid costs around 2,000 to 4,000 yen.

When the clutch starts to slip, the engine revs without corresponding acceleration, leading to excessive throttle use and decreased fuel efficiency. Therefore, if you notice symptoms, have it inspected or replaced as soon as possible.

FAQ on Motorcycle Clutch Adjustment

Source: https://pixabay.com/ja/photos/80-4650380/

This section summarizes frequently asked questions and answers regarding motorcycle clutch adjustment.

If you want to gain more knowledge about clutch adjustment and free play, please refer to this section.

What happens if there's too much clutch free play?

If there's too little clutch free play, the clutch cable might be pulled when turning the handlebars, causing the clutch to disengage unexpectedly or remain in a constant half-clutch state.

Conversely, if there is too much free play, the clutch may not disengage even when operated, leading to difficulty in engaging gears.

The appropriate clutch free play is considered to be between 10mm and 20mm, so adjust it to fall within this optimal range.

How often should I adjust my clutch?

The frequency of adjustment for a cable-operated clutch varies depending on how much the clutch is used, but it's a good idea to check the amount of free play every 2,000 to 3,000 km.

Additionally, if you feel that it's becoming difficult to shift into neutral or if gears are somewhat hard to engage, it's recommended to check if the clutch free play is set to the appropriate amount.

Is there a way to check if the clutch is slipping?

You can check if the clutch is slipping by putting the bike in first gear and trying to move forward while holding the rear brake.

If the clutch is normal, the engine will stall. If the clutch is slipping, the engine will rev without stalling, so you'll know immediately.

If the clutch is slipping, gears will become difficult to engage and fuel efficiency will worsen, so early inspection and replacement of necessary parts are required.

Is it better to have the clutch far or close?

The position of the clutch depends on hand size and personal preference, but if you can operate the clutch accurately, it's fine to adjust it to a position that makes clutch operation easy.

If the clutch doesn't disengage properly, power won't be cut, making shifting difficult, or the clutch plates will constantly be in a half-engaged state, leading to unnecessary wear.

It's important that the clutch disengages completely, so it's best to adjust it to a position and angle that suits you, as long as you can operate the clutch properly.

Summary

Source: https://pixabay.com/ja/photos/AD-bmw-r1200-3116194/

Motorcycle clutches come in cable-operated and hydraulic types. We've mainly focused on the free play adjustment required for cable-operated clutches.

The free play of a clutch cable, whether too much or too little, affects riding and the clutch, so it needs to be adjusted to the proper amount. However, hydraulic clutches automatically adjust the free play with clutch fluid, so no adjustment is necessary.

Motorcycle clutch adjustment can be done in two places. If adjusting the free play doesn't result in the proper amount, or if there is rust or fraying on the clutch cable, it needs to be replaced promptly to prevent cable breakage.