Slow-Speed Out Of Order; Overheating And Knocking - Robin EC05-2 Service Manual

Cause
Defects in fuel tank
system
Defects in carburetor
Defects i n carburetor
Excess load
Piston or Connecting
R o d seized
Remedy
1) Clean clogged tank outlet.
2) Clean clogged fuel strainer.
3)
I f incorrect fuel is poured i n t o tank or
water is mixed, drain tank completely and
fill it w i t h correct fuel.
4) When fuel pipe is locked w i t h air, expel1 air.
1
)
I f clogged w i t h dust, clean.
2 )
I f defective, replace.
Clean jets and other orifices, if they are
clogged.
1 ) Start engine with fully open choke vatve and
half open throttle valve.
2) Remove drain plug from crankcase, and
close fuel cock, repeat starting operation
several times t o evacuate excess fuel.
If
fuel overflows, check needle valve seat for
wear. Replace, i f necessary.
1) I f power transmission belt is too tight,
2 ) I f load is still too heavy, install a clutch.
correct tension.
1) If piston seizes, correct or replace.
2) If connecting rod large end or small end
seize, replace.
Preventive measure
11 Be sure t o use
a
filter when adding fuel.
2)
Use
mixture (gasoline 25 : oil 1
)
as fuel.
1 ) Never close choke valve when engine is
2 )
When stopping the engine, run it at slow
speed for a while. This practice not only
favourably affects next starting, b u t also
improves engine life.
3)
Clogged air-cleaner results i n too rich air-
fuel mixture.
C\ean
it
throughly.
warm.
Be careful clogged carburetor.
1 )
Do not use poor grade oil.
2) Use fuel of proper mixing ratio.
11-2 SLOW-SPEED out of order
1) I f
the pilot screw in the carburetor is not correctly adjusted, correct it. Refer to section "9-3. ADJUSTMENTS
of CARBURETOR".
2) Most defects listed as causes for starting difficulty are also causes for faulty slow-speed operating.
11-3 OVERHEATING and KNOCKING
1) If the ignition timing is too far advanced, correct it.
Model EC05-2,07-2,25-2
. . . . .
23"
Model EClO
. . . . . . . . . . . . . . .
18"
Model EC17
. . . . . . . . . . . . . .
.22"
2) If too much carbon deposits in the combustion chamber, remove it.
3) if the heat range of the spark plug is too cool, replace it with correct one.
Model EC05-2,07-2,25-2
. . . . .
NGK B6HS
Model EClO
. . . . . . . . . . . . . . .
NGK B-4
Model EC17
. . . . . . . . . . . . . . .
NGK B-4H
4) If the air-fuel mixture is too lean, clean jets and other holes in .the carburetor.
Clean the aircleaner also.
5 ) If the load is in excess, reduce it below the specified continuous load.
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