Robin America EX21 - Page 80

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ITEM STD Limit
PISTON
* Ring groove side clearance
Top
Second
EX13
EX17
EX21
EX27
0.035 - 0.080
(0.0014 - 0.0031)
0.15
(0.0059)
Oil ring
Coil exp
EX13
0.02 - 0.075
(0.0008 - 0.0031)
0.15
(0.0059)
EX17
EX21
0.01 - 0.065
(0.0004 - 0.0026)
EX27
0.01 - 0.065
(0.0004 - 0.0026)
Oil ring
(three-piece)
EX13
0.060 - 0.165
(0.0024 - 0.0065)
-------------------------------------------------------
EX17
EX21
0.0300 - 0.185
(0.0012 - 0.0073)
EX27
0.0100 - 0.205
(0.0004 - 0.0081)
* Piston pin hole
EX13
12.991 - 13.009
(0.5115 - 0.5122)
13.035
(0.5132)
EX17
EX21
15.991 - 16.009
(0.6296 - 0.6303)
16.035
(0.6313)
EX27
17.991 - 18.009
(0.7083 - 0.7090)
18.035
(0.7224)
* Piston pin outer diameter
EX13
12.992 - 13.000
(0.5115 - 0.5118)
12.960
(0.5102)
EX17
EX21
15.992 - 16.000
(0.6296 - 0.6299)
15.960
(0.6283)
EX27
17.992 - 18.000
(0.7083 - 0.7087)
17.960
(0.7071)
* Clearance between piston and cylinder
at skirt
EX13
0.040 - 0.079
(0.0016 - 0.0031)
0.25
(0.010)
EX17
EX21
EX27
0.050 - 0.089
(0.0020 - 0.0035)
* Piston ring end gap
Top
EX13
0.15 - 0.35
(0.0059 - 0.0138)
1.5
(0.0591)
EX17
EX21
0.15 - 0.3
(0.0059 - 0.0118)
EX27
0.1 - 0.3
(0.0039 - 0.0118)
Second
EX13
0.15 - 0.35
(0.0059 - 0.0138)
1.5
(0.0591)
EX17
EX21
EX27
0.2 - 0.4
(0.0078 - 0.0157)
Oil
(Coil exp)
EX13
0.2 - 0.4
(0.0078 - 0.0157)
1.5
(0.0591)
EX17
EX21
0.05 - 0.25
(0.0020 - 0.0098)
EX27
0.1 - 0.3
(0.0039 - 0.0118)
Unit: mm (in.)