Yamaha YZF-R1 1998 Service Manual

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ENG
VALVES AND VALVE SPRINGS
EB403100
REMOVING THE VALVES
The following procedure applies to all of
the valves and related components.
NOTE:
Before removing the internal parts of the
cylinder head (e.g., valves, valve
springs, valve seats), make sure that the
valves properly seal.
1.Remove:
• valve lifter 1
• valve pad 2
NOTE:
Make a note of the position of each
valve lifter and valve pad so that they
can be reinstalled in their original place.
2.Check:
• valve
(for leakage)
Leakage at the valve seat → Check the
valve face, valve seat, and valve seat
width.
Refer to “CHECKING THE VALVE
SEATS”.
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a. Pour a clean solvent a into the intake
and exhaust ports.
b. Check that the valves properly seal.
NOTE:
There should be no leakage at the valve
seat 1.
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Yamaha YZF-R1 1998 Specifications

General

Bore x Stroke	74.0 mm x 58.0 mm
Compression Ratio	11.8:1
Maximum Power	150 hp @ 10, 000 rpm
Transmission	6-speed
Final Drive	Chain
Frame	Aluminum Deltabox
Front Brakes	Dual 298mm discs, 4-piston calipers
Front Tire	120/70 ZR17
Rear Tire	190/50 ZR17
Ignition	Digital
Rear Suspension	adjustable preload, compression and rebound damping
Rear Brakes	Single disc
Wheelbase	1, 395 mm
Seat Height	815 mm
Fuel Capacity	18 liters
Dry Weight	177 kg
Length	2, 065 mm (81.3 inches)
Width	720 mm (28.3 in)
Height	1, 105 mm
Ground Clearance	140 mm
Front Suspension	Telescopic fork