What Does Clutch Control
Really Mean?
Don't be afraid to use the clutch...a lot!
If you’ve dabbled very long in the dirt bike world, you’ve probably heard riders discussing the
importance of “clutch control.” But what exactly does this mean? Having a steady clutch hand?
Shifting gears smoothly?
The concept of clutch control on a dirt bike goes far beyond simply taking off from a
stop and shifting gears. Having fine-tuned and instinctive clutching skills can unlock
everything from traction in slick conditions to high-level (and very cool) offroad techniques
like pivot turns and splatters.
Relying heavily on the clutch is a trend that came about only in the last couple of
decades. The clutches on the vintage bikes of the ‘60’s and ‘70’s are heavy, imprecise, and
grabby, and riders in the twin-shock era did everything they could NOT to touch their clutch
levers.
Today’s motorcycle clutches are smooth, light, and can be operated halfway (slipping)
extensively with minimal wear. They can be engaged and disengaged so smoothly that they create
almost no impulse on the rear wheel. However, you can also engage them as suddenly as a switch,
delivering instant power. The result? You can accomplish completely unrelated things using the
same tool.
What effect the clutch has varies depending on how quickly you actuate it, how much you
actuate it (fully engaged/disengaged or slipping), and when you use it (in relation to when you
apply/remove throttle or body input).
Here are some examples of what the clutch can do for you.
Lifting the Front Wheel
The clutch is what gives a wheelie precision, both at the point of liftoff and at wheel placement on landing.
Preventing Whiskey Throttle
Finding Traction
Although developing good throttle control is also an important skill, the reality is that it’s harder to be smooth with the throttle than it is with the clutch. The twist-grip is more prone to accidental input than is the clutch lever, and the non-linear power curve of some bikes makes it hard to deliver perfectly smooth power.Consequently, using the throttle alone to accelerate offroad often results in wheel spin and inconsistent acceleration. On slick rocks or muddy hills, it’s very difficult to regain traction once the wheel starts spinning freely.
The clutch can find traction where it otherwise doesn't exist.
Photo by Larry Mayo.
Rather than relying on throttle control to maintain traction, you can use the clutch to meter your power delivery and keep the tire glued to the ground. By working the clutch at the slipping point and making microscopic adjustments with the lever, a rider can respond to changes in the terrain to find what traction is available without wheel spin: feeding out the clutch to put more power down in spots with higher traction, then pulling it in slightly to reduce power to the rear wheel and avoid spinning over slick patches of ground. Working the clutch in this manner is often referred to a “feathering” the clutch. Developing this feel can take years, and fine-tuned clutch control is something that separates the pros from the Joes.
Tightening Up a Turn
Pulling in the clutch lessens the power to the rear wheel, causing the bike to lean tighter into a turn.
Faster Corner Exit Speeds
Pulling in the clutch while navigating a turn allows you to keep the engine revved up, so you can feed the clutch back out and be back on the power immediately and smoothly once you’re past the apex. If you roll off the throttle to slow for the turn, the engine can drop out of the power band and accelerate more slowly when you twist the throttle back on.(This is more important on two-stroke bikes that have a narrow power band than it is on the torquey four-strokes that are prominent today, it should be noted, and modern schools of thought are mixed on clutching technique when it comes to cornering on a track.)
Keeping the engine revved up while pulling in the clutch around a corner can result in higher corner exit speeds.
Photo by Briarhill Photography.
Explosive Power Delivery
Developing Your Clutch Control
Learning to work the clutch at the engagment point is a key skill.
The first step in mastering the clutch is to learn to feel the engagement point. Experiment with where the clutch starts to slip, and practice controlling the speed of the bike by moving the clutch lever in and out in small degrees around the point where it slips (i.e. engages/disengages).
Practice riding at slow speed with the clutch slipping, revving the engine periodically to feel how changes in RPM change the clutch engagement level. This will start to develop your feel for how the clutch can be operated across a range, rather than just as an ON/OFF switch.
This type of clutch operation is used heavily in hillclimbs, slow-speed turning, and navigating technical parts of the trail.
Next, practice releasing the clutch quickly to feel the sudden impulse it can provide to the rear wheel.
Start by rolling along at slow speed with the clutch pulled in, revving the engine slightly above idle, and then releasing the clutch quickly. The bike should lurch forward gently.
Do NOT rev the engine high and then pop the clutch, unless you enjoy momentary thrills and lying on your back in the dirt.
From there, continue repeating the drill with increasingly higher engine RPM to feel how much instant power the clutch can deliver. This concept is the foundation for both precise and explosive wheelies.
Better clutch control will affect every part of your riding and unlock new terrain and new techniques. Good clutch work is a huge part of what separates the advanced riders from the rookies, and dedicating time to improving your clutch control is one of the most valuable things you can do to advance your capabilities as a rider.