When off-roading through rough terrains or suddenly hearing unfamiliar noises from your motorcycle, it’s a sign that some part of your bike is encountering issues and needs maintenance or replacement.
Diagnosing bike problems through the engine can be relatively challenging; typically, only experienced, seasoned technicians can provide the most accurate diagnoses. When strange sounds emerge, you should pinpoint their source, whether it’s the engine, tires, frame, etc. Below are some tips from RuudNguyen.com to help you promptly repair and maintain your iron horse.
Engine Noise
Remember to Listen to Your Iron Horse’s Noise (Photo: Nguyễn Văn Sơn)
Every time you start your motorcycle and ride for a while, you’ll hear a knocking sound. This noise can be caused by a bent drive rod, leading to direct contact with the crankshaft and creating a knocking sound. This phenomenon often occurs on older motorcycles or those ridden on complex terrains like mountain roads or rocky paths.
If spark plugs with lower heat range than the engine’s specifications are installed, the spark plug electrode will overheat, leading to symptoms like the ones mentioned above. Typically, engine noise issues have multiple causes and should be thoroughly inspected and repaired by professional mechanics, so make sure to take your bike to a professional for service.
Noise from Chain and Belt
Chain and Belt Noise is often emitted from the chain and belt (Collected Photo)
The sounds may include rattling, revving, whining, or clattering noises. For example, a common issue is the clattering noise from the chain when accelerating, especially in manual transmission motorcycles like the Yamaha Exciter or Winner. This can be caused by chain misalignment or worn-out sprockets and chain guides, leading to chain slippage and clattering against the chain guard, creating the clattering sound.
Typically, for each type of manual or automatic transmission motorcycle, it’s essential to monitor the mileage and replace the chain and belt accordingly. In scooters, a prevalent issue is the revving of the engine while the scooter doesn’t move. This can result from the belt slipping or the contact surface between the pulley and the clutch slipping, causing the scooter to remain stationary despite full throttle.
Moreover, during the rainy season, especially on flooded roads, motorcycles face their eternal nemesis. You are likely to encounter situations where water enters the exhaust, causing the engine to stall.
Water may also enter the fuel tank or spark plug, leading to similar issues. In scooters, these situations occur when water flows into the engine cylinder, causing the belt to slip. Additionally, it can result from the clutch pulley and the variator not making contact, making the scooter sluggish even when the throttle is fully opened.
Suspension System (Shock Absorber)
When you experience leaking shocks, you should inspect them immediately (Collected Photo)
A loud “clunking” noise coming from the front when going over rough or bumpy roads may indicate weakened front shock absorbers. The shock absorber’s oil can become oxidized, leading to a loss of smoothness and causing scratches inside the shock’s cylinder, impairing its performance. When this issue arises, it’s essential to inspect, replace the shock absorber’s spring, seals, and shock oil.
The Brake System
Regularly Monitor Brake Wear (Collected Photo)
The unpleasant squeaking sound when applying the brakes can be a sign of brake wear and metal-to-metal contact between the brake pad and the disc (or drum in the case of drum brakes). Over time, this can lead to more serious damage.
Dirt, debris, or hard objects stuck on the brake pad surface can also cause damage. It’s essential to check and clean the brake pad surface. If the brake pad surface is hardened and damaged, it should be resurfaced or replaced.
These are common reasons for noise from your motorcycle. To prevent such issues and ensure a safe adventure, regular maintenance is crucial. Just like humans, motorcycles need proper preparation before heading out for a safe off-road trip.
See more: How to Rescue and Repair Your Motorcycle After Water Immersion
See more: How to Inspect Your Motorcycle Brakes Before a Road Trip
See more: Why Is Your Motorcycle Leaking Oil? Causes and Solutions
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