Robin America EX21 - Standard Dimension and Limits of Use; Standard Repair Tables

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16. STANDARD REPAIR TABLES
“STD” in the following table is the parts dimension from the brand new engine or the spare parts.
Whereas, “Limit” shows the maximum allowance for the parts to be used on the engine.
If the measurement exceeds beyond the “Limit”, the part needs to be replaced and/or repaired.
16-1 STANDARD DIMENSIONS AND LIMITS OF USE
ITEM STD Limit
CYLINDER HEAD
*Flatness
EX13
EX17
EX21
EX27
0.05
(0.002)
0.1
(0.004)
* Intake/exhaust valve seat
contact width
Intake
Exhaust
EX13
EX17
EX21
EX27
0.7 - 1.0
(0.0276 - 0.0394)
----------------------
* Intake/exhaust valve guide inner diameter
Intake
Exhaust
EX13
EX17
EX21
EX27
5.500 - 5.518
(0.2165 - 0.2172)
----------------------
* Rocker arm pin outer diameter
Pin outer
diameter
D
1 ,D 2
EX13
EX17
EX21
EX27
5.970 - 5.980
(0.235 - 0.235)
5.9
(0.232)
* Rocker arm pin support inner diameter
Support
inner
diameter
D
3 ,D 4
EX13
EX17
EX21
EX27
6.00 - 6.018
(0.236 - 0.237)
6.05
(0.238)
Unit: mm (in.)
D 3 D 4
D1 D2