Yamaha 2009 YZF-R1 (Y) User Manual

VALVES AND VALVE SPRINGS
5-34
e. Apply a fine lapping compound to the valve
face and repeat the above steps.
f. After every lapping procedure, be sure to
clean off all of the lapping compound from
the valve face and valve seat.
g. Apply Mechanic’s blueing dye (Dykem) “b”
onto the valve face.
h. Install the valve into the cylinder head.
i. Press the valve through the valve guide
and onto the valve seat to make a clear
impression.
j. Measure the valve seat width “c” again. If
the valve seat width is out of specification,
reface and lap the valve seat.
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EAS24310
CHECKING THE VALVE SPRINGS
The following procedure applies to all of the
valve springs.
1. Measure:
• Valve spring free length “a”
Out of specification → Replace the valve
spring.
2. Measure:
• Compressed valve spring force “a”
Out of specification → Replace the valve
spring.
Valve spring free length
Free length (intake)
39.33 mm (1.55 in)
Limit
37.36 mm (1.47 in)
Free length (exhaust)
37.96 mm (1.49 in)
Limit
36.06 mm (1.42 in)
Installed compression spring
force (intake)
187.00–215.00 N (19.07–21.92
kgf, 42.04–48.33 lbf)
Installed compression spring
force (exhaust)
185.00–213.00 N (18.86–21.72
kgf, 41.59–47.88 lbf)
Installed length (intake)
34.50 mm (1.36 in)
Installed length (exhaust)
33.00 mm (1.30 in)
b. Installed length

Yamaha 2009 YZF-R1 (Y) Specifications

General

Bore x Stroke	78.0 mm x 52.2 mm
Compression Ratio	12.7:1
Fuel System	Fuel injection with YCC-T and YCC-I
Ignition	TCI: Transistor Controlled Ignition
Transmission	6-speed w/multiplate slipper clutch
Final Drive	Chain
Front Tire	120/70-ZR17
Rear Tire	190/55-ZR17
Seat Height	835 mm
Wet Weight	206 kg
Engine Type	Liquid-cooled, 4-stroke, DOHC, inline 4-cylinder
Front Suspension	43 mm inverted fork, fully adjustable
Rear Suspension	Single shock, fully adjustable
Front Brakes	Dual 310 mm discs, radial-mount 6-piston calipers
Rear Brakes	220 mm disc, single-piston caliper
Dimensions (L x W x H)	2, 070 mm x 715 mm x 1, 130 mm
Wheelbase	1415 mm
Fuel Capacity	18 L