Suzuki GSF1250 Service Manual

1D-50 Engine Mechanical:
• Apply engine oil to O-ring and install the oil jet.
• Tighten the ECT sensor to the specified torque.
CAUTION
!
Replace the O-ring and gasket with new
ones.
Tightening torque
ECT sensor (b): 18 N·m (1.8 kgf-m, 13.0 lb-ft)
Cylinder Inspection
B718H11406020
Refer to “Engine Top Side Disassembly (Page 1D-24)”.
Refer to “Engine Top Side Assembly (Page 1D-28)”.
Cylinder Distortion
Check the gasket surface of the cylinder for distortion.
Use a straightedge and thickness gauge. Take clearance
readings at several places. If any reading exceeds the
service limit, replace the cylinder.
Special tool
: 09900–20803 (Thickness gauge)
Cylinder distortion
Service limit: 0.20 mm (0.008 in)
Cylinder Bore
Measure the cylinder bore diameter at six places. If any
one of the measurements exceed the limit, overhaul the
cylinder and replace the piston with an oversize piston.
The remaining cylinders must also be rebored
accordingly; otherwise, the imbalance might cause
excessive vibration.
Special tool
(A): 09900–20530 (Cylinder gauge set)
Cylinder bore
Standard: 79.000 – 79.015 mm (3.1102 – 3.1108 in)
Piston-to-cylinder Clearance
Refer to “Piston and Piston Ring Inspection (Page 1D-
52)”.
(b)
I718H1140138-01
I718H1140139-01
(A)
I718H1140140-01
I718H1140141-01

Suzuki GSF1250 Specifications

General

Displacement	1255 cc
Bore x Stroke	79.0 mm x 64.0 mm
Compression Ratio	10.5:1
Fuel System	Fuel injection
Transmission	6-speed, constant mesh
Front Suspension	Telescopic, coil spring, oil damped
Rear Suspension	Link type, coil spring, oil damped
Front Brakes	Dual hydraulic disc
Rear Brakes	Single hydraulic disc
Front Tire	120/70ZR17M/C (58W), tubeless
Rear Tire	180/55ZR17M/C (73W), tubeless
Overall Length	2130 mm
Overall Width	790 mm
Seat Height	805 mm
Wheelbase	1485 mm
Fuel Tank Capacity	19.0 L
Starter	Electric
Final Drive	Chain
Ignition	Electronic ignition (transistorized)
Engine Type	4-stroke, liquid-cooled, DOHC
Ground Clearance	135 mm