Suzuki GSF1250 Service Manual

1D-76 Engine Mechanical:
Crankshaft Runout
Support the crankshaft using V-blocks as shown, with
the two end journals resting on the blocks. Set up the
dial gauge as shown, and rotate the crankshaft slowly to
read the runout. Replace the crankshaft if the runout
exceeds the service limit.
Special tool
(A): 09900–20607 (Dial gauge (1/100 mm, 10
mm))
(B): 09900–20701 (Magnetic stand)
(C): 09900–21304 (V-block (100 mm))
Crankshaft runout
Service limit: 0.05 mm (0.002 in)
Conrod Crank Pin Bearing Inspection and
Selection
B718H11406028
Refer to “Conrod Removal and Installation (Page 1D-
74)”.
Inspection
1) Inspect the bearing surfaces for any signs of fusion,
pitting, burn or flaws. If any, replace them with a
specified set of bearings.
2) Place the plastigauge axially along the crank pin,
avoiding the oil hole, as shown.
Special tool
(A): 09900–22301 (Plastigauge (0.025 -
0.076 mm))
3) Tighten the conrod cap bolts to the specified torque,
in two stages.
NOTE
• When installing the conrod cap to the
crank pin, make sure that I.D code “A” on
the conrod faces towards the intake side.
• Never rotate the crankshaft or conrod
when a piece of plastigauge is installed.
Tightening torque
Conrod cap bolt: 21 N⋅m (2.1 kgf-m, 15.0 Ib-ft)
then turn in 1/4 (90°) turn.
(A)
(C)
(B)
I718H1140283-01
I718H1140285-01
(A)
I718H1140286-01
“A”
I718H1140287-01

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