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My ef3000 yamaha generator surges when on low

My ef3000 yamaha generatorsurges when on low speed. runs good under load

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  • 8 Answers

Idle jet dirty. clean carby thoroughly

Posted on May 14, 2014

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Posted on Jan 02, 2017

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SOURCE: rpm surge with intermediate power load

The problem is the governor and is easily fixed. Do the following: Remove back and side panels to expose fuel tank. Insert screwdriver into fuel on/off switch on front panel and remove. Now remove top panel. To do this unscrew fuel cap, pull out fuel spill surround rubber and remove top panel, just pull gently. Now with fuel tank exposed, remove retaining bolts. Gently lift tank and rest on frame. No need to disconnect fuel line.On top of carby is the governor, protected in a black plastic shield. Unscrew the retaining screws that hold it to the carby. Remove electrical connection and then remove governor from carby. Now remove cover by pressing on the three retaining plastic clips and prize upwards. Now the solenoid is exposed. Remove solenoid from its base by unscrewing the two retaining screws. Now that the solenoid is fully exposed use an spray on electrical cleaner that can be used on circuit boards. Spray the base of the solenoid in particular the spindle. Whilst spraying the spindle rotate it a few times until it moves freely. Then replace everthing in reverse order. Where the spindle exits the solenoid dust particles collect and increase the friction between the two surfaces. If you do not want to proceed as outlined tell your dealer it is the solenoid and have it fixed under warranty.

Posted on Feb 14, 2009

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SOURCE: 1000 watt Yamaha generator surges when on low setting

YOU PROBABLY HAVE LINKAGE PROBLEMS ON THE CARB IS IT AUTO THROTTLE IF SO YOU MAY ONLY NEED TO ADJUST THE SETTING SCREWS GIVE ME SOME DETAILS LIKE BRAND HORSE POWER CARB BRAND AND MODEL AND I MAY HAVE THE EXACT ANSWER FOR YOU I HAVE ALOT OF SMALL ENGINE RESOURCES FOR SPECS AND DIAGRAMS

Posted on Jun 24, 2009

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1 Answer

Why is it surging under load?


Yep - the carb needs to be removed and cleaned out thoroughly to remove the clogging responsible for the surging. Motor needs a smooth supply of gas - look at what your car does when you jerk around with the gas pedal. Also check the governor area of generator since that keeps motor running at a certain fixed speed. If there is something wrong with it, that will also cause the problemo.

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Most generators use a flyball type governor within the engine to control rpm; also there is a voltage regulator that tries to maintain voltage at about 115v. The voltage regulator varies the voltage to the armature increasing /adjusting magnetic force. Use a meter with htz or freq setting to adjust engine governor to 60 cycles. When the generator is producing 60 cycles, the engine should be turning 3600 rpm, max power range. At 3600 rpm the voltage should be 115 to 120 volts. Loading the generator will cause governor to try to maintain 3600 rpm. Check engine manual for proper adjustment of gonvernor and linkage. The governor mech should last the life of the engine, however governor system does wear out. Expensive repair. enjoy

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The carburetor is probably clogged up. Mix a bottle of carburetor cleaner with the gas to see if that would help. Also check/replace the fuel filter.

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