Trouble Shooting; Starting Difficulties - Robin EC05-2 Service Manual

. I
11. TROUBLE SHOOTING
For a gasoline engine to start and run satisfactorily, the following three reyuirements must be met:
1 ) The cylinder filled with a proper fuel-air mixture.
2) An appropriate compression in the cylinder.
3) Good spark at correct time
to
ignite the mixture.
If all
the three requirements are
not
met simultaneously, an engine can not be started. There are also other factors such as
heavy load at starting and too long an exhaust pipe causing a high back pressure, which contribute to hard starting.
The most
common causes
of engine troubles are given below.
11-1 STARTING DIFFICULTIES
Cause
~
Defects in spark plug
Defects in high-tension
cable
Defects in contact
breaker
Defects in magneto
Other defects in
electric system
Gas leak through head
gasket'or other parts
Defects in piston
assembly
Remedy
1) If contaminated, wash i n gasoline, remove
2) I f spark plug is broken and lost insulation,
3) Adjust spark gap t o 0.5
-
0.6mm. (for Model
foreign material and dry.
replace plug.
EC10)
I f cable is burnt, replace cable along with coil.
1) If breaker points are rough, smooth out
surface with emery paper
(#400).
2) If breaker point gap is incorrect, adjust
it
t o
specified
0.4
*
0.05mm (for Model EC10) by
loosening contact support plate lock screws.
3)
If spark timing is incorrect, adjust
it
t o
18"-23" before TDC. (refer t o 4-1 1
)
4) If breaker is defective in insulation, replace
breaker.
5) If condenser is defective, replace.
1) If
wire or insulation
is
broken, replace
2) If magnetism is weak, re-magnetize (at the
magneto.
magneto maker) or replace.
'
1) If
stop-button
is
faulty, (short circuiting)
replace or repair.
2) If
primary wire
is
grounded to the engine
body, insulate it with insulating adhesive
tape.
1 ) If head gasket is defective, replace.
2)
If
head bolts are loose, tighten.
3)
If spark plugs are loose, tighten.
4) If spark plugs are defective, replace.
1) If piston is worn, replace.
2) I f cylinder is worn, re-bore and use oversize
piston and piston ring. (No oversize for
E C 0 5 2 and 07-2.)
3) If piston rings are worn, replace.
4) If piston rings are stuck, clean or replace
rings.
Preventive measure
1) Use spark plugs of specified heat range.
Do
not use poor grade oil. Clean air cleaner and
avoid dust entry.
2) When spark gap is adjusted, i f center el-
trode is h i t o r bent, insulator may get
damaged.
1) Keep air cleaner always clean.
2) Do
not use poor grade oil. Change oil
regularly.
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