Engine Knocks; Engine Backfires Through Carburetor - Robin EY14 Service Manual

7)
Engine operated in closed space without fresh supply of cooling air.
8) Restricked exhaust gas outlet.
9) Engine detonating due to low octane gasoline with heavy load at low speed.
Carbon deposit in combustion space.
11-5 ENGINE KNOCKS
1) Gasoline
of poor
quality
or
low octane rating.
2)
Engine operating under heavy-load at low speed.
3) Carbon or lead deposits in cylinder head.
4) Incorrect spark timing.
5) Lose or burnt out connecting rod be.aring.
6)
Worn or loose piston pin.
7)
Engine overheated.
11-6 ENGINE BACKFIRES THROUGH CARBURETOR
1) Water or dirt in gasoline or poor grade of gasoline.
2) Sticky intake valve.
3) Overheated valves,
or hot
carbon particles in engine.
4)
Engine cold.
-
40
-