Holding the clutch while going downhill on a motorcycle can have certain effects, but whether they are harmful depends on the specific circumstances and duration of clutch engagement. Here are a few things to consider:
Engine braking: When you release the throttle and engage the clutch while going downhill, you disengage the engine from the drivetrain. This means you lose the benefits of engine braking, which can help control speed and maintain stability. Depending on the steepness of the hill and the desired speed, this may or may not be an issue.
Increased wear on the clutch: Holding the clutch for an extended period, especially when it's not necessary, can lead to increased wear on the clutch components. The clutch is designed to engage and disengage frequently during gear changes, but continuously holding it can put unnecessary stress on the clutch plates, resulting in premature wear.
Reduced control: With the clutch disengaged, you have less control over the motorcycle's power delivery. This can make it more challenging to modulate the speed or respond to unexpected situations while descending downhill.
Overheating brakes: By relying solely on the brakes to control your speed downhill, you may put more strain on them, potentially leading to overheating. Continuous use of the brakes without the assistance of engine braking can cause them to overheat and lose effectiveness.
It's generally recommended to use a combination of engine braking and the brakes while going downhill to maintain control and manage your speed. However, it's important to note that specific riding conditions, the motorcycle's design, and personal preference can affect the approach you take. If you have concerns or are unsure about the best technique for descending on your particular motorcycle, it's advisable to consult the owner's manual or reach out to the manufacturer or a qualified mechanic for guidance.