Robin EHO9-2D User Manual

– 31 –
Problem and possible cause
Poor outputOverheatRough Idling
Remedy
1. Insufficient compression 1) Loosen spark plug Retighten; replace gasket
2. Ignition system problems
3. Fuel system malfunction
4. Low air intake volume
1. Carburetor system
2. Intake system
3. Cylinder head
4. Valve system
5. Ignition system
1. Engine
1) Weak spark
7) Improper valve clearance
2) Leakage from cylinder head gasket
3) Piston ring seizure or wear
4) Piston or cylinder wear
5) Incorrect valve and seat contact
6) Valve stem seizure
Adjust
Retighten; replace gasket
Replace
Repair or replace
Repair or replace
Repair or replace
3) Improper air gap between ignition coil and
flywheel
1) Faulty spark plug
2) Faulty ignition coil
4) Demagnetization (flywheel magneto) Replace
Replace
Replace
Adjust
4) Poor quality gasoline or water in gasoline
1) Carburetor clogged
2) Fuel strainer and/or hose clogged
3) Air in fuel lines
Replace
Overhaul, clean
Clean or replace
Check and retighten joints
Repair or replace
1) Air cleaner clogged Clean or replace
2) Throttle valve malfunction
5) Overloading
1) Cooling air flow obstructed at inlet or cylinder
baffle portion
2) Poor quality engine oil
3) Lean fuel/air mixture
4) Excessive back pressure of exhaust system
Adjust to rated load
Clean
Replace
Check and adjust
carburetor
Check and clean or replace
2) Slow system passage clogged
1) Low idling speed
Check and clean
Adjust
1) Air mixing from air intake system joints
Check and tighten;
replace gasket
1) Gasket faulty (blow-by) Replace
3) Excessive clearance between valve stem and
guide
Adjust
Repair
Replace
1) Improper valve clearance
2) Leakage from valve seat
Check; adjust or replace
plug

Robin EHO9-2D Specifications

General

Brand	Robin
Model	EHO9-2D
Category	Engine
Language	English