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5-5 BREAK-IN OPERATION
A new engine or an engine that has been completely overhauled by being fitted with a new piston, rings,
valves and connecting rod should be thoroughly RUN-IN before being put back into service.
Good bearing surfaces and running clearances between the various parts can only be established by
operating the engine under reduced speed and loads for a short period of time.
While the engine is being tested, check for oil leaks.
Make final carburetor adjustment and regulate the engine operating speed.
S
e t
p
S
e t
p
1
S
e t
p
2
S
e t
p
3
S
e t
p
4
S
e t
p
5
6. MAGNETO
6-1 OPERATION AND FUNCTION
The ignition system of the EH09D and EH12-2D is a breakerless flywheel magneto with an automatic
advancing system.
Being different from the breaker point type ignition system, this system is completely free from such
troubles as starting-up failure due to dirty, burnt or corroded point surface.
The electronic automatic advancing ensures extremely easy starts and stable high performance at oper-
ating speed by advancing the ignition timing to the most suitable point.
6-2 BASIC THEORY
(1) Revolution of the flywheel generates electricity on the primary side of the ignition coil, and the base
current I
flows to the power transistor.
1
Current I
turns the power transistor "ON" and the electric current I
1
L
o
a
N
o
L
N
o
L
N
o
L
E
H
0
9
D
E
H
1
2
2 -
D
E
H
0
9
D
E
H
1
2
2 -
D
d
o
a
d
o
a
d
o
a
d
0
7 .
k
W
1 (
0 .
H
) P
1
0 .
k
W
1 (
4 .
H
) P
1
4 .
k
W
1 (
9 .
H
) P
2
1 .
k
W
2 (
8 .
H
) P
Table. 5-2
- 46 -
E
n
g
n i
e
S
p
e
e
d
i T
2
5 ,
0
0
p r
m
1
3
0 ,
0
0
p r
m
1
3
6 ,
0
0
p r
m
1
3
6 ,
0
0
p r
m
3
3
6 ,
0
0
p r
m
6
flows.
2
m
e
0
m
i
. n
0
m
i
. n
0
m
i
. n
0
m
i
. n
0
m
i
. n
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