Yamaha YZF-R1(B) 2012 Service Manual

Also see for YZF-R1 2012: Service manual

Contents

VALVES AND VALVE SPRINGS5-29EAS24280REMOVING THE VALVESThe following procedure applies to all of thevalves and related components.TIPBefore 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”TIPMake 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 seatwidth.Refer to “CHECKING THE VALVESEATS” on page 5-31.▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼a. Pour a clean solvent “a” into the intake andexhaust ports.b. Check that the valves properly seal.TIPThere should be no leakage at the valve seat“1”.▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲3. Remove:• Valve cottersTIPRemove the valve cotters by compressing thevalve spring with the valve spring compressor“1” and the valve spring compressor attach-ment “2”.4. Remove:• Valve spring retainer “1”• Valve spring “2”• Valve “3”• Valve stem seal “4”• Valve spring seat “5”TIPIdentify the position of each part very carefullyso that it can be reinstalled in its original place.Valve spring compressor90890-04019YM-04019Valve spring compressorattachment90890-04108Valve spring compressoradapter 22 mmYM-04108