Robin EY28 Service Manual

16. TABLES OF CORRECTION STANDARDS
ITEM
ENGINE STANDARD
I MODEL 1 SiZE
USE
LIMIT
REMARKS
1 TOOL
CORRECTION
METHOD
Flatness of cylinder
head
I EY20 1 Less than 0.1 1 0.15
EY28
7
Correct
plate,
Boring
EY 15
S.T.D. 63 dia.
. Dif. between
Bore
+0.019
0
67 dia. rnax. & rnin.
EY 20
-
EY28
EYl5
S.T.D. 75 dia.
EY
28
Roundness 0.01
EY 20
0.65
I
0.1 5
EY15
EY20
1
EY 28
Cylindricity
0.01
5
Valve seat contact
width
EY 15
2.5
Correct
Replace
1.2 -1.5
EY15
Valveguide
I.D. I EY20 1 6.5@ I
EY 28
+0.022
0.1 5
At middle
Cylinder
portion
gauge
0.1 5
S.T.D.62.98 dia.
EY15
B 63.23 dia.
O.D. at skirt, in
thrust direction
(incl. over size)
0 0.25
C 0.5
-0.1
-0.1
Micro-
meter
S.T.D.66.98dia.
67.23 dia.
S.T.D. 74.98 dia.
EY28
B 75.23 dia.
C 75.48 dia.
0
- 0.02
Replace
EY15
I EY2O I Oil "* I
I I
Width of ring
+0.060
groove t0.040
Top 1.5
0.1 5
Replace
1 I Oil 30
+0.002
I -0.009
14 dia.
Piston
pin hole
+0.002
- 0.009
0.035
16 dia.
0.035
Max. cylin-
Micro-
EY15
Clearance between
piston and cylinder
EY20
0.020-0.059
-
0.025
EY
28
0.040-0.079
Replace
thrust direc-
tion
meter
0.090-0.135
Clearance between
0.060-0.1 05
pisition ring and
0.010-0.065
ring groove To P 0.050-0.095
EY 20 0.010-0.055
0.010-0.065
0.1 5
Replace 0.1 5
- 59 -

Robin EY28 Specifications

General

Ignition System	Transistorized magneto ignition
Starting System	Recoil starter
Fuel System	Carburetor
Lubrication System	Splash
Dry Weight	25 kg
Cooling System	Air-cooled