EY35, EY40 - Small Engine Discount

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9. TROUBLE SHOOTING The following three conditions must be satisfied for satisfactory engine start. 1. The cylinder filled with a proper fuel-air mixture. 2. An appropriate compression in the cylinder. 3. Good sparks at the correct time to ignite the mixture. The engine cannot be started unless these three conditions are met. There are also other factors which make engine start dif- ficult, e. g., a heavy load on the engine when it is about to start at low speed, and high a back pressure due to a long exhaust pipe, just to say a few. The most common causes of engine troubles are given below: 9-1 STARTING DIFFICULTIES 9-1 -1 FUEL SYSTEM NO gasoline in th fuel tank; or the fuel cock is closed. The carburetor is not choked enough, particularly when the engine is cold. Water, dust or gum in the gasoline block flow of the fuel to the carburetor. Inferior grade gasoline or poor quality gasoline is not gasfied enough to produce the correct fuel-air mixture. The carburetor needle carburetor when the engine is idling. (Overflow) valve is held open by dirt or gum. This trouble can be detected as the fuel flows out of the This trouble may be remedied, depending on cases, by lightly tapping the float chamber with the grip of a screwdriver of the like. If the carburetor overflows, excessive fuel runs into the cylinder when starting the engine, making the fuel-air mixture too rich to burn. If this happens, remove the spark plug, and turn the starting pulley a few turns in order to let the rich fuel-air mixture out of the spark plug hole into the atmosphere. Keep the carburetor choke open during this operation. Dry the spark plug well, screw it into place, and try to start again. 9-1-2 COMPRESSION SYSTEM If starting difficulties and loss of power are not due to the fuel system or ignition system, the following must be checked for possible lack of compression. 1) Engine inside is completely dried up because of a long period of non-operation. 2) Loose or broken spark plug. This causes a hissing noise made by mixture gas running out of cylinder in compression stroke during cranking. 3) Damaged head gasket or loose cylinder head. A similar hissing noise is produced during compression stroke. 4) Incorrect Tappet 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, and clean, remedy or replace the parts. - 30 -
9-1-3 ELECTRICAL SYSTEM Check the following for lack of sparks. Leads of the ignition coil, spark plug or contact breaker disconnected. Ignition coil damaged and shorted. Spark plug cable wet or soaked with oil. Spark plug dirty or wet. Spark plug electrode gap incorrect. Spark plug electrodes in contact with each other. Contact breaker points pitted or fused. Breaker arm stuck. Condenser leaking or grounded. Incorrect spark timing. ENGINE MISFIRES 0 9-3 ENGINE STOPS 1) Incorrect spark plug electrode gap. Adjust it to anywhere between 0.6 and 0.7 mm. Ignition cable worn and leaking. Sparks weak. Ignition wire connections loose. Pitted or worn breaker points. Water in gasoline. Insufficient compression. Fuel tank empty. Water, dirt, gum, etc. in gasoline. Vapor lock, i. e., gasoline evaporating in the fuel lines due to overheat around the engine. Vapor lock in the fuel lines or carburetor due to the use of too volatile winter gas in the hot season. Air vent hole in the fuel tank ca plugged. Bearing p.arts seized due to lack of oil. Magneto or ignition coil faulty. 9-4 ENGINE OVERHEAT Crankcase oil level low. Add oil immediately. Spark timing incorrect. Low grade gasoline is used, or engine is overloaded. Cooling air circulation restricted. Cooling air party misdirected causes loss of cooling efficiency. Cylinder head cooling fins clogged up with dirt. Engine operated in an enclosed space without fresh supply of cooling air. Exhaust gas discharge restricted, or carbon deposits in the combustion chamber. Engine running on low-octane gasoline detonates due to heavy load at low speed. - 31 -
Page 2 and 3: - ROBIN AMERICA, INC. ROBIN TO WISC
Page 4 and 5: See rion Title Page 6 . CARBURETOR
Page 6 and 7: 2. PERFORMANCE 2-1 MAXIMUM OUTPUT T
Page 8 and 9: 3. FEATURES Small in size, light in
Page 10 and 11: 4-5 CAMSHAFT Models EY3S-B, 3S-BS,
Page 12 and 13: 4-11 COOLING DEVICE The cooling fan
Page 14 and 15: 4-17 SECTIONAL VIEW OF ENGINE / REC
Page 16 and 17: ~ 5. DISASSEMBLY and REASSEMBLY 5-1
Page 18 and 19: I I I I I Order Item Procedures Rem
Page 20 and 21: Order 15 - 16 17 Item Electric devi
Page 22 and 23: 5-4 HOW TO REASSEMBLE 5-4-1 PRECAUT
Page 24 and 25: ~ MATCH 5) Assemble the piston and
Page 26 and 27: .TAPPET CLEARANCE ADJUSTMENT Move t
Page 28 and 29: *SPARK CHECK * Clean the point surf
Page 30 and 31: 6, CARBURETOR SPECIFICATION I EY35
Page 32 and 33: ~ 1 6-2-4 MAIN SYSTEM 1) Remove the
Page 36 and 37: ENGINE KNOCKS Low-quality gasoline.
Page 38 and 39: 10-5-2 FLEXIBLE COUPLING When using
Page 40 and 41: 10-7 VINYL-INSULATED WIRE Recent en
Page 42 and 43: 12. TABLES OF CORRECTION STANDARDS
Page 44 and 45: ITEM 1 4- .4- 5 Journal OD. Valve s
Page 46 and 47: - ITEM MODEL rpm TOOL REMARKS ,- Mi
Page 48: 13-5 EVER'.' 502 - 600 HOURS (SEMIA

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