Yamaha YZF-R1 2007 Service Manual

VALVES AND VALVE SPRINGS5-23EAS24280REMOVING THE VALVESThe following procedure applies to all of thevalves and related components.NOTE:Before removing the internal parts of the cylin-der head (e.g., valves, valve springs, valveseats), make sure the valves properly seal.1. Remove:• Valve lifter “1”• Valve pad “2”NOTE:Make a note of the position of each valve lifterand valve pad so that they can be reinstalled intheir original place.2. Check:• Valve sealingLeakage at the valve seat → Check thevalve face, valve seat, and valve seat width.Refer to "CHECKING THE VALVE SEATS"on page 5-25.▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼a. Pour a clean solvent “a” into the intake andexhaust ports.b. Check that the valves properly seal.NOTE:There should be no leakage at the valve seat“1”.▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲3. Remove:• Valve cotters “1”NOTE:Remove the valve cotters by compressing thevalve spring with the valve spring compressor“2” and the valve spring compressor attach-ment “3”.4. Remove:• Upper spring seat “1”• Valve spring “2”• Valve stem seal “3”• Lower spring seat “4”• Valve “5”NOTE:Identify the position of each part very carefullyso that it can be reinstalled in its original place.EAS24290CHECKING THE VALVES AND VALVEGUIDESThe following procedure applies to all of thevalves and valve guides.Valve spring compressor90890-04019YM-04019Valve spring compressorattachment90890-04108Valve spring compressoradapter 22 mmYM-04108Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keysemail: info@motomatrix.co.uk