BRP Johnson 4HP Service Manual page 18

GENERAL INFORMATION
*SPECIFICATIONS
Item
CYLINDER/PISTON/PISTON RING
Cylinder distortion
Piston to cylinder clearance
Cylinder bore
Cylinder measuring position
Piston skirt diameter
Piston measuring position
Cylinder bore wear
Piston ring end gap
Piston ring free end gap
Piston ring to groove
clearance
Piston ring groove width
Piston ring thickness
Pin clearance in piston pin hole
Piston pin outside diameter
Piston pin hole diameter
Pin clearance in conrod small end
1-12
Unit
Limit mm (in)
STD mm (in)
Limit mm (in)
STD mm (in)
mm (in)
STD mm (in)
mm (in)
Limit mm (in)
1st STD mm (in)
Limit mm (in)
2nd STD mm (in)
Limit mm (in)
1st, 2nd STD mm (in)
Limit mm (in)
1st, 2nd STD mm (in)
Limit mm (in)
1st, 2nd STD mm (in)
Oil STD mm (in)
1st, 2nd STD mm (in)
STD mm (in)
Limit mm (in)
STD mm (in)
Limit mm (in)
STD mm (in)
Limit mm (in)
STD mm (in)
Limit mm (in)
Data
0.05 (0.002)
0.010 – 0.040 (0.0004 – 0.0016)
0.100 (0.0039)
62.000 – 62.015 (2.4409 – 2.4415)
35 (1.4) from cylinder top surface
61.975 – 61.990 (2.4400 – 2.4406)
14 (0.6) from piston skirt end
0.100 (0.0039)
0.20 – 0.35 (0.008 – 0.014)
0.70 (.028)
0.35 – 0.50 (0.014 – 0.020)
1.00 (0.039)
Approx. 8.5 (0.33)
6.8 (0.27)
0.03 – 0.07 (0.001 – 0.003)
0.12 (0.005)
1.22 – 1.24 (0.048 – 0.049)
2.51 – 2.53 (0.099 – 0.100)
1.17 – 1.19 (0.046 – 0.047)
0.006 – 0.019 (0.0002 – 0.0007)
0.040 (0.0016)
17.995 – 18.000 (0.7085 – 0.7087)
17.980 (0.7079)
18.006 – 18.014 (0.7089 – 0.7092)
18.030 (0.7098)
0.006 – 0.019 (0.0002 – 0.0007)
0.050 (0.0020)