Suzuki GSF650 Service Manual

Engine Mechanical: 1D-41
• Put on the valve spring retainer (2), and using the
special tools, press down the spring, fit the cotter
halves to the stem end, and release the lifter to allow
the cotter halves to wedge in between retainer and
stem.
CAUTION
!
• Be sure to restore each spring and valve to
their original positions.
• Be careful not to damage the valve and
valve stem when handling it.
Special tool
(A): 09916–14510 (Valve lifter)
(B): 09916–14521 (Valve spring compressor
attachment)
: 09916–84511 (Tweezers)
• Be sure that the rounded lip “F” of the cotter fits snugly
into the groove “G” in the stem end.
• Install the other valves and springs in the same
manner as described previously.
• Install the tappet shims and the tappets to their
original positions.
NOTE
• Apply engine oil to the stem end, shim and
tappet before fitting them.
• When seating the tappet shim, be sure the
figure printed surface faces the tappet.
Cylinder Head Related Parts Inspection
B817H21406028
Refer to “Cylinder Head Disassembly and Assembly
(Page 1D-38)”.
Cylinder Head Distortion
1) Decarbonize the combustion chambers.
2) Check the gasket surface of the cylinder head for
distortion. Use a straightedge and thickness gauge.
Take clearance readings at several places. If
readings exceed the service limit, replace the
cylinder head.
Special tool
: 09900–20803 (Thickness gauge)
Cylinder head distortion
Service limit: 0.20 mm (0.008 in)
2. Valve spring retainer 3. Cotter
(B)
(A)
2
I718H1140116-02
“F”
3
2
G
I718H1140117-02
I717H1140111-01
I717H1140112-01

Suzuki GSF650 Specifications

General

Displacement	656 cc
Bore x Stroke	65.5 mm x 48.7 mm
Compression Ratio	11.5:1
Fuel System	Fuel injection
Ignition	Electronic ignition (transistorized)
Starter	Electric
Transmission	6-speed, constant mesh
Final Drive	Chain
Front Suspension	Telescopic, coil spring, oil damped
Rear Suspension	Link type, coil spring, oil damped
Front Tire	120/70ZR17M/C (58W), tubeless
Rear Tire	160/60ZR17M/C (69W), tubeless
Overall Length	2, 130 mm
Rear Brakes	Disc brake
Fuel Tank Capacity	19.0 L
Wheelbase	1, 470 mm
Seat Height	790 mm
Ground Clearance	135 mm
Engine Type	4-stroke, liquid-cooled, DOHC, 4-cylinder