20 Most Recent Yamaha 4500 Watt Electric Start Generator - EF5200DE - Page 4 Questions & Answers


If you have not properly shut down the unit after use you will have likely had fuel remaining in the carburetor. The fuel will have evaporated while the unit was not in use leaving a film behind. This residue will plug and interfere with the fuel passages and metering orifices of the carburetor. If the unit runs with the choke on it is likely the carburetor is dirty. Be running the engine the carburetor will possibly clean itself. Make sure you remove any old fuel from the machine and replace with fresh. Allow the unit to run for an extended length of time attempting to return the choke to the run position. If you are able to return the choke to the run position you are on the way of solving this problem. You may need to run it additional time to completely purge the residue.

Additives are available to clean the carburetor and as a last resort if running with fresh fuel doesn't' return the motor to normal you may try it. For best results after mixing and running with the additives leave the unit overnight which may help to remove the remaining residue.

The shelf life of gas containing ethanol is about 30 days. In the future it is best to run the unit dry leaving ot fuel in the carburetor.

All else fails you will need to have the unit serviced by a small engine service center.

Yamaha... | Answered on Nov 19, 2015


it seems to be the standard that the rating or model ??1000 or ??1500 or ??2500 or ??5000 or??5500 or ??6500 is the kv rating of the gen-set regardless of straight or inverter
so if yours is EF1000 it will be 1000 watts or 1 kv
remember that most electric drills are 1000 watt units so a unit this small is mostly good for lights, charging batteries, small compressors for tyres

Yamaha... | Answered on Jul 04, 2015


Never heard of refrig working this way; all that know are closed systems that a person inside will suffocate.. What brand and model?

Yamaha... | Answered on Jun 01, 2015


If oily smoke is coming out of the muffler, then it is an indication that the rings are bad. Make sure that the oil is at the proper level.

Yamaha... | Answered on May 04, 2015


The YAMAHA ET500 uses an NGK Spark Plug # B5ES 6410 or equivalent. I hope this is helpful.

Yamaha... | Answered on Mar 20, 2015


well first off you need to add a question .

Yamaha... | Answered on Mar 19, 2015


Regardless of it being either a two or four cycle engine the piston rings are at fault, if not the cylinders having scratches or groves

Yamaha... | Answered on Feb 22, 2015


By reversing the polarity you could have burned out the the stater motor. Or if is fused it is blown out.

Yamaha... | Answered on Feb 22, 2015


If the fuel tank is below the carb, check for a check valve in the fuel line not seating. You can verify by shooting a bit of starting fluid in the breather. If it starts and then hesitates a bit and then runs, it means that the engine speed was adequate to suck fuel back up into the line to the carb.

Yamaha... | Answered on Feb 05, 2015


Most likely your battery has a cell or two dead oe weak. I think if you replace it you will find it working as it should. The batteries used in this gear is not of high quality. They generally fail in two years r so especially if left not maintained an go down.

Yamaha... | Answered on Jan 28, 2015


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

Yamaha... | Answered on Sep 26, 2014


This sounds like a fuel supply problem. Probably gum or varnish in the carbureator. Rebuild the carb and it should be fine.

Yamaha... | Answered on May 23, 2014


Unless you are going to use this exclusevly for 240V service, this is a bad idea. Your 120V legs will float between 0V and 220V.

Yamaha... | Answered on May 23, 2014

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