Yamaha EF1000iS Service Manual
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Page 81
5-7 IGNITION SYSTEMELEC 7. Oil level switch 9Remove the oil level switch from the bottom of the crankcase. Refer to “CRANKSHAFT2, CAMSHAFT AND ROCKER ARM” in CHAPTER 3. 9Connect the pocket tester to the oil level switch for continuity. Tester (+) lead →Blue lead 1 Tester (–) lead →Ground 2 1 212 å∫ å å Continuity →Correct ∫ ∫ No continuity →Correct 8. Wire harness 9Check the terminal of the connector for con- tamination, rust, or disconnection. Replace the speed limiter. Replace the TCI unit. * Replace...
Page 82
5-8 GENERATOR SYSTEMELEC GENERATOR SYSTEM TROUBLESHOOTING CHART WEAK OR NO AC CURRENT Start the engine. Check the overload warning light. DOES NOT TURN ON TURNS ON Start the engine. Check the pilot light. DOES NOT TURN ON TURNS ON Rated engine speed inspection. 9Operate the engine with no load. 9Set the economy switch to “OFF”. 5,000 r/min GOOD OUT OF SPECIFICATION Check the overload warning light. TURNS ON DOES NOT TURN ON Check the pilot light. Check the throttle control system. Refer to “THROTTLE...
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5-9 GENERATOR SYSTEMELEC AC coil 2 AC voltage inspection 9Connect White-Orange (R-S), Orange-White (S-T), and White-White (R-T) leads. 9Start the engine, then measure the voltage. (Tester range: AC120V) GOODTOO LOW DOES NOT GENERATE AC coil 2W Or WW W W Br G BrBr Br Br AC coil 1R S T R S T AC coil 2 AC voltage: 13.5 ~ 23.0 V at 20 °C (68 °F) * Magnetic force is weak. Replace the magneto rotor. AC coil 2 resistance inspection 9Stop the engine. 9Measure the resistance between White-Orange (R-S),...
Page 84
5-10 GENERATOR SYSTEMELEC TROUBLESHOOTING CHART WEAK OR NO DC CURRENT Rated engine speed inspection. 9Operate the engine with no load. 9Set the economy switch to “OFF”. 5,000 r/min GOOD OUT OF SPECIFICATION Check the throttle control system. Refer to “THROTTLE CONTROL SYSTEM” in CHAPTER 6. Check the DC circuit breaker. GOOD DISCONNECTED Replace the DC circuit breaker. DC coil DC voltage inspection 9Connect Blue leads. 9Start the engine, then measure the voltage. (Tester range: DC 20V) GOODTOO LOW DOES...
Page 85
6-1 ENGINETRBL TROUBLE SHOOTING ENGINE ENGINE DOES NOT START Check that the oil warn- ing light turns ON by pulling the starter rope. LIGHT ON DOSE NOT TURN ON Check engine oil level. SUFFI-INSUFFI- CIENTCIENT Check fuel level. SUFFI-INSUFFI- CIENTCIENT Check fuel cock lever position. “ON” “OFF” Check if fuel flows to fuel cock. GOOD NO GOOD Check connections between oil warning unit and oil level switch. GOOD NO GOOD Check if fuel is deteriorated. GOOD NO GOOD Replace oil warning light, oil warning...
Page 86
6-2 ENGINETRBL Check carburetor for clogged passages or fuel overflow. GOOD NOT GOOD * Replace. Measure valve clear- ance. GOOD OUT OF SPECIFICATIONAdjust. Check compression using compression gauge. OUT OFGOODSPECIFICATION Check valve face and valve seat for wear. GOOD WEARResurface or replace. Check if the marks on the crankshaft and camshaft are aligned. GOOD NO GOODCorrect or replace. Check if there is seizure or wear on the piston, piston ring, or cylinder. GOOD SEIZURE OR WEARRebore or replace....
Page 87
6-3 ENGINETRBL ENGINE STARTS BUT STALLS Check fuel level. SUFFI-INSUFFI- CIENTCIENTAdd. Clean. Check if fuel cock is clogged. GOOD NO GOOD Clean. Check if fuel hose is clogged. GOOD NO GOOD 9Check if carburetor retaining nuts are loose. 9Check if there is air suction due to a dam- aged carburetor joint or gasket. GOOD NO GOOD 9Tighten the carburetor bolts securely. 9Replace carburetor joint or gas- ket with a new one. Measure valve clear- ance. GOOD OUT OF SPECIFICATIONAdjust. Check compression using...
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6-4 ENGINETRBL ENGINE SPEED DOES NOT INCREASE Check if the electric equipment consumes too much wattage for this generator. GOOD TOO MUCH Use a generator with a larger capacity. Check air filter element for dirt. GOOD NO GOOD Clean. Check spark plug for dirt and check spark plug gap. GOOD NO GOOD Clean or adjust. Check valve clearance. GOOD NO GOOD Adjust. Check if main passages such as, the main jet, in the carburetor are clogged. GOOD NO GOOD Disassemble or clean. Check for air suction due to a damaged...
Page 89
6-5 ENGINETRBL ENGINE SPEED IS UNEVEN Check fuel level. SUFFICIENT INSUFFICIENT Add. Check if fuel is deteriorated. GOOD NO GOOD Replace fuel. Check if fuel tank cap is clogged. GOOD NO GOOD Replace. Check if fuel cock is clogged. GOOD NO GOOD Clean. Check fuel pump operation. GOOD NO GOOD Replace. Check spark plug for dirt and check spark plug gap. GOOD NO GOOD Clean, adjust or replace. While the engine is operating, pull the choke knob approximately 1/3 to 1/2 way out, and then check the engine...
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6-6 THROTTLE CONTROL SYSTEMTRBL THROTTLE CONTROL SYSTEM ENGINE DOES NOT START, ENGINE STARTS BUT STALLS, ENGINE SPEED DOES NOT INCREASE, OR ENGINE SPEED IS UNEVEN. Check AC output. GOOD NO GOODRefer to “GENERATOR SYSTEM” in CHAPTER 5. Rotate the shaft of the throttle control motor to check if it turns smoothly with slight resistance. GOOD NO GOOD Replace the throttle control motor. Replace the throttle control motor. Replace the control motor. Measure the coil resistance between 3-1, 3-2, 3-4, and 3-5...