Engine Misfire; Engine Stops - Robin EH09D Service Manual

(4) Incorrect Valve clearance
If the correct compression is not obtained even after remedying the above, disassemble the engine
and check further as follows :
a) Valve stuck open due to carbon or gum on the valve stem.
b) If the piston rings are stuck on the piston, remove the piston and connecting rod from the engine.
Clean or replace the parts.
10-1-3 IGNITION SYSTEM
Check the followings for lack of sparks.
(1) Wires of the ignition coil, spark plug or contact breaker disconnected.
(2) Ignition coil damaged and shorted.
(3) Spark plug cable wet or soaked with oil.
(4) Spark plug dirty or wet.
(5) Spark plug electrode gap incorrect.
(6) Spark plug electrodes are connected or bridged.
(7) Incorrect spark timing.
(8) Proper connection of all wires.
10-2 ENGINE MISFIRES
(1) Incorrect spark plug electrode gap. Adjust it to anywhere between 0.7 and 0.8 mm.
(2) Ignition cable worn and leaking.
(3) Sparks weak.
(4) Ignition wire connections loose.
(5) Water in gasoline.
(6) Insufficient compression.

10-3 ENGINE STOPS

(1) Fuel tank empty. Water, dirt, gum, etc. in gasoline.
(2) Vapor lock, i. e., gasoline evaporating in the fuel lines due to overheating of the engine.
(3) Vapor lock in the fuel lines or carburetor due to the use of too volatile (winter) gas in the hot season.
(4) Air vent hole in the fuel tank cap plugged.
(5) Bearing parts seized due to lack of oil.
(6) Magneto or ignition coil faulty.
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