Piston And Piston Ring Inspection - Suzuki GSX-R750 Service Manual

1D-72 Engine Mechanical:

Piston and Piston Ring Inspection

Refer to "Piston Ring Removal and Installation
(Page 1D-70)".
Piston Diameter
Measure the piston diameter using the micrometer at 15
mm (0.6 in) "a" from the skirt end. If the piston diameter
is less than the service limit, replace the piston.
Special tool
(A): 09900–20203 (Micrometer (1/100 mm, 50 –
75 mm))
Piston diameter
Service limit: 69.880 mm (2.7512 in)
"a": 15 mm (0.6 in)
Piston-to-cylinder Clearance
Subtract the piston diameter from the cylinder bore
diameter. If the piston-to-cylinder clearance exceeds the
service limit, replace both the cylinder and the piston.
Piston-to-cylinder clearance
Service limit: 0.120 mm (0.0047 in)
Piston Ring-to-groove Clearance
B838H21406035
Measure the side clearances of the 1st and 2nd piston
rings using the thickness gauge. If any of the clearances
exceed the limit, replace both the piston and piston
rings.
Special tool
Piston ring-to-groove clearance
Service limit (1st): 0.180 mm (0.0071 in)
Service limit (2nd): 0.150 mm (0.0059 in)
Piston ring groove width
Standard (1st): 1.01 – 1.03 mm (0.0398 – 0.0406 in)
Standard (2nd): 0.81 – 0.83 mm (0.0319 – 0.0327 in)
Standard (Oil): 1.51 – 1.53 mm (0.0594 – 0.0602 in)
Piston ring thickness
Standard (1st): 0.97 – 0.99 mm (0.0382 – 0.0390 in)
Standard (2nd): 0.77 – 0.79 mm (0.0303 – 0.0311 in)
"a"
I837H1140184-01
(A)
I649G1140262-03
(A): 09900–20803 (Thickness gauge)
(B): 09900–20205 (Micrometer (0 – 25 mm))
(A)
I649G1140263-03
(B)
I649G1140264-03