Slipping Clutch A clutch slip is evident when you twist the throttle but don’t achieve the desired acceleration, and the bike doesn’t move in tandem with the engine’s rpm. Smell of Burning If you’ve ever noticed a foul, burning smell coming from your bike after a long ride, it’s a clue that you should inspect the clutch. Hard Gear Shifts When the clutch lever feels stiff, or the gears move jerkily, it’s a sign that the friction material is worn out and the clutch plates need to be replaced.