When to Replace a Dirt Bike Clutch – A dirt bike is a generally sturdy vehicle. However, there is a point wherein you need to replace parts like the wheels and chain. Aside from external pieces, there are internal pieces that may need to be replaced. One of them is the clutch. A dirt bike’s clutch is made up of metal discs and friction plates in a basket-like setup. These parts spin and can either slide or grip together, controlling how the engine’s power goes to the transmission.
The clutch serves a pivotal role in getting the dirt bike into motion while in gear. Typically found on motocross and enduro bikes, a clutch lever on the left side of the handlebars is a reliable indicator of a dirt bike’s clutch presence. This lever bears a resemblance to the front brake lever located on the right side of the handlebars.
Signs for When to Replace a Dirt Bike Clutch
Just like with any other piece, maintaining and cleaning your dirt bike is just not enough. At one point, any of the following signs may appear to indicate a need to replace the clutch:
Clutch Slipping
Clutch slipping occurs when the clutch is partially engaged, causing the bike to move while the engine RPM spins faster than the transmission would with full engagement. This technique is used for starting from a stop but can also indicate a worn-out clutch. Identifying a slipping clutch is easy: when you throttle aggressively while in gear, yet the rear wheel doesn’t match the engine’s RPM, something’s amiss. If you’re struggling to accelerate in high gear, or if you sense an unusual sensation at the clutch lever, these signs suggest internal clutch components may be worn and warrant inspection.
Causes
Clutch slipping happens when worn clutch plates no longer grip but slide against each other due to friction over time. In a well-functioning clutch, drive plates and friction plates compress during clutch engagement, synchronizing the clutch basket and inner hub. This ensures smooth energy transfer from the engine to the transmission. Even with careful usage, clutch plates wear out, causing slipping.
The main cause is usually worn clutch plates, which can be addressed by inspecting steel and fiber plates after disassembling the clutch. Additionally, worn clutch springs can worsen the issue by losing tension needed to engage the pressure plate effectively. Just like clutch plates, clutch springs also have a limited lifespan.
Clutch Drag
Clutch drag occurs when the clutch doesn’t fully disengage, causing it to exert power on the transmission, leading to the bike’s forward movement even when the clutch lever is pulled in, such as when shifting to first gear. This phenomenon is often accompanied by a lumpy or jerky feeling in the clutch lever during engagement/disengagement. These sensations serve as clear indicators that there may be damage to the clutch basket and/or inner hub, necessitating a thorough inspection.
Causes
If your bike has the original clutch basket, it’s probably made of diecast aluminum. Although it’s lightweight, its durability might not be impressive.
Diecasting involves pouring molten aluminum into a mold, which solidifies into the final part. The resulting material isn’t very dense due to voids, porosity, inclusions, and imperfections. The components within the material aren’t tightly bonded.
Creeping & Bad Smell
A strong, burning smell is emanating from the bike, sometimes noticeable even after entering the pits. The scent can become particularly evident upon removing the clutch cover. Additionally, you might observe your bike moving forward slightly despite the clutch being engaged and the gear engaged. This creeping motion persists despite adjustments to the clutch cable.
Causes
Typically, the first parts to burn are the friction plates, emitting a distinct and recognizable odor. Visible signs include heat marks on the drive plates and potential blackening of the friction plates. It’s advisable to measure the plates according to specifications in your owner’s manual, checking for proper width and flatness to ensure you’re within the acceptable tolerance range.
Making a Clutch Last Longer
While there are signs that a clutch may need replacement, there are still ways to maintain it and make it last longer. Extending the lifespan of your clutch involves several strategies. The most impactful approach is reserving clutch use solely for starting the bike in first gear. However, as your riding expertise advances, mastering clutch utilization can enhance speed and efficiency.
Optimal methods for prolonging a dirt bike clutch’s longevity encompass mastering clutch control techniques, employing suitable oil, adhering to regular oil changes, and shifting into neutral when stationary. Should the need arise for clutch replacement, it’s reassuring to know that clutch components are reasonably priced, and the replacement process can be accomplished in your garage without undue difficulty.
If you want to learn more about taking care of parts of your bike, you can check out how to clean a chain, maintain tire pressure, or adjust the suspension. You can also learn things like how to install dirt bike valves and fix a sticky throttle.
