Robin EC12 User Manual

Cause
Preventive measure
Remedy
1
1) Start engine with fully open choke valve
and half open throttle valve.
2) Remove drain plug from crankcase, and
close fuel cock,repeat starting operation
several
times to discharge excess fuel.
1) Never close choke valve when engine is
warm.
2) When stopping the engine, run it at siow
speed for a while. This practice not only
favorably affects next starting,
but also
improves engine life.
3) Clogged air-cleaner results in too rich
airfuel mixture.
Clean
it thoroughly.
I
If fuel overflows, check needle valve seat for Be careful clogged carburetor.
1 Defects in carburetor wear. Replace, if necessary. I
Q
S
E
u
os
Excess load
2!
1) If tension of transmission belt is too tight,
2%.
s3
uE
1) If piston seizes,repair or replace. 1) Do not use poor grade oil.
E'
Piston Or Connecting
2) If connecting rod large end or small end
2) Use fuel of proper mixing ratio.
o
Rod seized
e
reduce tension.
2) If load is still too heavy, install a clutch.
seize,replace.
12-2 SLOWSPEED out of order
Most defects listed as causes for starting difficulty are also causes for faulty slow-speed operating.
12-3 OVERHEATING and KNOCKING
1) If carbon deposits have accumulated in the combustion chamber, remove them.
2) If the heat range of the spark plug is too cool, replace it with correct one, i.e. NGR BM6A or
3) If the air-fuel mixture is too lean, clein jets and other passages in the carburetor.
4) If the load is in excess, reduce it below the specified continuous load.
CHAMPION CT8.
Clean the air cleaner also.
124 POWER DROP
1) If the cylinder, piston or piston rings are worn, replace them or re-bore the cylinder and fit oversize
2) If the carburetor is out of order, re-adjust or clean it.
3) If the spark plug is faulty (contamination, gas leakage or faulty insulation), dean it or replace it.
4) If combustion gas leaks through the head gasket, re-tighten the clamping screws.
If the gasket is faulty,replace it.
5) If the magneto is faulty, replace it.
6) If the air cleaner is clogged, clean it.
7) If the fuel system is clogged, clean it.
8) If the oil seals at the crankshaft are worn and the compressed gas is leaking, replace them.
piston and piston
rings. Replace or clean piston rings if they are stuck in the grooves.
12-5 EXCESSIVE FUEL CONSUMPTION
1) If air-fuel mixture is too rich, clean jets and passages in carburetor.
2) If the throttle shaft of carburetor is worn, replace throttle shaft. (carburetor)
3) If fuel is leaking, re-tighten screws or replace faulty part.
4) If the engine suffers power drop accompanied with excessive fuel consumption, trouble-shoot by
following step
7-4.
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Robin EC12 Specifications

General

Brand	Robin
Model	EC12
Category	Engine
Language	English