Robin America EH63, Service Manual

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Phenomenon Possible causes Remedy
1. Low engine
speed at
starting
1) Battery discharged Charge battery
2) Poor connection between battery and starter motor Clean or repair
3) Poor connection between battery and ground Clean or repair
4) Electric starter faulty Repair or replace
5) Improper engine oil
Replace with recommended
engine oil
2. Ignition
system
malfunction
Spark plug
* Improper spark plug gap
* No insulation
* Carbon deposits Adjust
Replace
Clean
Ignition coil
* No insulation or discontinuity
* Poor connection or discontinuity of ignition code Replace
Repair or replace
Improper air gap between ignition coil and flywheel Adjust
3. Fuel system
malfunction
1) No fuel in fuel tank Refill
2) Fuel pump clogged Clean
3) Fuel hose clogged or pinched Clean or replace
4) Air mixing into fuel lines Check and adjust connecting portion
5) Improper gasoline or water infiltration Replace
6) Carburetor
* Overflow
* Clogged or damaged
* Improper operation of throttle valve Adjust
Disassembly and clean
Check and adjust
7) Poor connection of fuel cut valve wiring Check and repair
4. Engine core
components
malfunction
1) Insufficient tightening of cylinder head bolts Check and retighten
2) Wear of piston, piston ring and/or cylinder Repair or replace
3) Improper contact of valve and seat Repair
4) Valve seizure Repair
5) Improper valve clearance Adjust
6) Intake manifold gasket leakage
Retighten intake manifold bolts or
replace gasket
7) Carburetor gasket leakage
Retighten carburetor bolts or replace
gasket
8) Insufficient tightening of spark plug Retighten
9-2 STARTING DIFFICULTIES