Robin America EH63, Service Manual

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9-9 ENGINE MISFIRE
Phenomenon Possible causes Remedy
1. Ignition system
1) Improper spark plug gap or damaged electrode Cealn, adjust or replace
2) Ignition coil faulty Replace
3) Damaged ignition system wirings Replace
4) Poor connection of ignition system wirings Check and connect properly
2. Fuel system
1) Lean or rich air/fuel mixture Disassembly and repair
2) Carburetor clogged Disassembly and repair
3) Improper idling adjustment of carburetor Adjust
4) Improper gasoline or water infiltration Replace
3. Engine core
componets
1) Valve heat deterioration or improper valve adjustment Adjust or replace
2) Valve spring deterioration Replace
3) Low compression Check, adjust or replace