EBC Diaphragm Spring Yamaha YZF R1 98-03

These are a dish shaped flat steel pressure ring and there are normally only 1 or 2 in a bikes engine, you should never add more springs on a diaphragm spring set up.

If you do wish to upgrade the clamp load and your bikes is fitted with a diaphragm spring clutch kit buy an EBC diaphragm spring spring kit, all of which are built with 10-15% more clamp pressure than standard.

This can again reduce clutch slip and premature clutch wear.