Suzuki RM-Z250 - Camshaft + Cylinder Head; Cylinder + Piston + Piston Ring

SERVICING INFORMATION 20-3
CAMSHAFT + CYLINDER HEAD Unit: mm (in)
CYLINDER + PISTON + PISTON RING Unit: mm (in)
ITEM STANDARD LIMIT
Cam height
IN.
34.78 – 34.83
(1.369 – 1.371)
34.48
(1.357)
EX.
33.94 – 33.99
(1.336 – 1.338)
33.64
(1.324)
Camshaft journal oil clearance
IN. & EX.
0.023 – 0.066
(0.0013 – 0.0026)
0.150
(0.0059)
Camshaft journal holder I.D.
IN. & EX.
22.003 – 22.025
(0.8663 – 0.8671)
—
Camshaft journal O.D.
IN. & EX.
21.959 – 21.980
(0.8645 – 0.8654)
—
Camshaft runout
—
0.10
(0.004)
Cam chain pin 13th pin —
Cylinder head distortion
—
0.05
(0.002)
ITEM STANDARD LIMIT
Compression pressure
(Automatic decomp. actuated)
400 – 800 kPa
(4.0 – 8.0 kgf/cm
2
, 57 – 114 psi)
—
Piston to cylinder clearance 0.030 – 0.040
(0.0012 – 0.0016)
0.120
(0.0047)
Cylinder bore 77.000 – 77.015
(3.0315 – 3.0321)
Nicks or
scratches
Piston diam. 76.965 – 76.980
(3.0301 – 3.0307)
Measure at 8.0 mm (0.31 in) from the skirt end.
76.880
(3.0268)
Cylinder distortion
—
0.05
(0.002)
Piston ring free end gap
1st IR Approx. 7.1 (0.28)
5.7
(0.22)
Piston ring end gap
1st
0.15 – 0.25
(0.006 – 0.010)
0.50
(0.020)
Piston ring to groove clearance
1st —
0.180
(0.0071)
Piston ring groove width
1st
1.01 – 1.03
(0.0398 – 0.0406)
—
Oil
1.51 – 1.53
(0.0594 – 0.0602)
—
Piston ring thickness
1st
0.97 – 0.99
(0.0382 – 0.0390)
—
Piston pin bore 16.002 – 16.008
(0.6300 – 0.6302)
16.030
(0.6311)
Piston pin O.D. 15.995 – 16.000
(0.6297 – 0.6299)
15.980
(0.6291)