Robin EY28 Service Manual

ITEM
ENGINE STANDARD CORRECT1
1 MODEL I SIZE TOLERANCE
USE
LIMIT
REMARKS
I METHOD
CORRECTION
N
LIMIT
-0.15
"
0.3
blow
abow
0.05
0.25
0.5
Micro-
meter
Replace
EY15
Intake 0.025
- 0.062
Exhaust
0.056 0.1 00
Clearance between
Cylinder
gauge
Replace
At middle
0.3
stem and guide
EYrn Intake
0.025
- 0.062
EY 28 Exhaust
0.056 - 0.100
When cold
0.10 *0.02
Feeler
gauge
Correct
Clearance between
groove and retainer
I I
EY15
Feeler
gauge
Replace
0.5
0.1 - 0.3
I EY,5 I Intake Exhaust 5.9 5.9 1
Stem end length I EY2O I Intake 6'2 I
Exhaust 6.4
Vernier
calipers
Replace
-1 .o
- 0.5
0.2
-1 .o
- 0.5
0.2
Exhaust
Tntake
4.45
I EY15 I
35.6
I
Vernier
calipers
Replace
EY28
43.7
1 0.013 - 0.037
stem and guide
EY28
0.013-0.043
1 I NGKBBHS 1
Spark plug
I EY28 I NGK BPBHS I
EY15
I :;: I
Feeler Adjust or
replace
Spark gap
0.6 - 0.7
1
t 5"
f 0.1
I
1
EY15
I EY20 I
EY 28
Spark timing
23'before
T.D.C.
Timing
tester
Adjust
breaker Adjust
spanner
Point opening
f 0.05
- 62 -

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