Robin EC05-2 - 11. TROUBLE SHOOTING; 11-1 STARTING DIFFICULTIES

.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 in gasoline, remove
2) If spark plug is broken and lost insulation,
3) Adjust spark gap to 0.5 - 0.6mm. (for Model
foreign material and dry.
replace
plug.
EC10)
If 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 to
specified
0.4 * 0.05mm (for Model EC10) by
loosening contact support plate lock screws.
3) If spark timing is incorrect, adjust it to
18"-23" before TDC. (refer to
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) If cylinder is worn, re-bore and use oversize
piston and piston ring.
(No oversize for
EC052 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, if center el-
trode is hit or bent, insulator may get
damaged.
1) Keep air cleaner always clean.
2) Do not use poor grade oil. Change oil
regularly.
-43 -