Barnett Clutch Spring Conversion Kit Yamaha Converts diaphragm spring to coil spring for better control and engagement. Features: Barnett spring conversion kit is designed to convert the stock diaphragm spring assembly to a coil spring assembly This kit will give your bike a more positive, controllable clutch engagement compared to the stock set up Includes a CNC machined billet aluminum pressure plate and heavy duty coil springs Installation will require purchase of OEM case gasket