20 Most Recent Yamaha 4500 Watt Electric Start Generator - EF5200DE - Page 8 Questions & Answers

you have a weak rectifier if it will not produce the needed voltage. Rectifiers are checked with an ohm meter

Yamaha... | Answered on May 20, 2011

Hi and welcome to FixYa, I am Kelly
First off I am just trying to help you and not participating on the FixYa site for the money. I have been working on small engines and generators since the late 1960's.

This is usually caused by the speed limiter assy. (Not a cheap part)
Item 22 this link:
The feedback wiper in the speed limiter is either dirty or worn. When you re-position the throttle arm the feedback wiper is making good contact again so it works normally. It appears that the feedback wiper in the speed control is not making good contact at full RPM so it does not drive the throttle linkage to idle.
If your careful dependng on the design of your speed control you just might be able to take the cover off and clean it up so the wiper makes contact. Wht ever you do DO NOT lift the wiper arm up. You will bend it and never be able to get it to function again. Just clean it. You can use sand paper but... be real careful.
If your speed control is 100 % electronic with only a small DC motor actuator you may have to see if you can clean the brushes and armature slip rings of the internal DC motor.
I have brought several speed controls back to life but it really is a major game of chance anytime you open one up. Just know that your stuck with a very expensive replacement cost for a speed control unit if you screw it up. ----
----It is not a bad thing to keep using your generator with a defective / improperly functioning speed control. As you know is just will not throttle down.
The part number listed above is for the original part number and has been superceded by another part number:
The ($60.00) service manual for this generator is available from Yamaha by PN: LIT-19616-CM-20
Anywhere else the manual is $80.00!

Thanks for choosing FixYa,

Yamaha... | Answered on Feb 02, 2011

Check that the vent hole in the cap isn't obstructed.


Yamaha... | Answered on Jan 18, 2011

Tip it over sideways - no drain hole exists, just the inlet.

Yamaha... | Answered on Dec 24, 2010

Usually if a generator sits for awhile, it will lose its polarity. A quick check for this is to plug in a drill, start the generator and turn the the voltage on has if to use it, then turn the drill chuck has quickly has possible. This action re-polarizes the generator unit. I would also make sure the circuit breakers are seated down.

Yamaha... | Answered on Nov 15, 2010

What have you tried so far? An engine needs fuel, air and spark to work properly.
Fuel - Has the generator been sitting for more than a couple of months? There could be bad gas in it, and/or varnish built up inside somewhere in the fuel tank/lines. The carburetor could be plugged somewhere blocking proper fuel delivery.
Air - The choke may not be working/applied properly, or the air filter clogged.
Spark - The spark plug could be fouled, have you tried seeing if there is spark or not? Is the spark plug wire on tight, is it the correct one, is it clean and gapped properly, etc?

Yamaha... | Answered on Nov 13, 2010

What model is it??

Yamaha... | Answered on Nov 06, 2010

flooded cab to much gas

Yamaha... | Answered on Nov 01, 2010

Usually when that happens it is because the diode(s) has gone out...


Yamaha... | Answered on Aug 18, 2010

It is likely not a winding short but more likely in wiring or components in the inverter. Remove output connections and with simple loads like light bulbs check the conditions of the genset itself.

Note: Small digital voltmeters will respond to the tiny currents caused by the capacitance of wiring and windings giving false readings. Use know loads like light bulbs to draw current during test.

Yamaha... | Answered on Aug 04, 2010

Use a standard battery charger set to a low setting like two amps for a few hours.

Yamaha... | Answered on Jul 25, 2010

You can disconnect the fuel line from the carb and drain the gas. It would be even better to then remove the fuel tank. If this is the generator with the large plastic tank, quite often the rubber gromet in the bottom of the tank with shout off vavle in it will deteriorate into a black gooey mess, and leak. If so that will have to be replaced. Clean inside of tank with fresh gasoline. Remove bowl from carburator and clean throughly. If you know how to work on engines, remove the carburator and clean throughly, notice how all springs and linkage were connected before removeal. Be sure all passage ways in carb are clean. Always use sta-bill in your gas.

Yamaha... | Answered on Jul 23, 2010

Fuel Starvation - Float Bowl Carburetor
1) remove air filter assembly
*be cautious of tearing the mounting gasket. If it does tear, you HAVE to replace it. It is part of the priming system
2) remove the float bowl fastener. This is the main jet
3) carefully remove the float bowl, the rubber o-ring/gasket will not be able to be used if it is removed, you WILL have to replace it
4) using a spray 'carb cleaner'
spray up thru the center of the carburetor
spray and clean the main jet with cleaner and 'tag' wire
(tag wire is very thin, and can be used to clean the hole in the center of the main jet)
5) clean any debris from inside the bowl or carb body
6) re-install bowl and center bolt, air filter assembly

*if you need gaskets, your local lawn & garden dealer can supply. The kit is cheaper than individual gaskets, and all the parts needed to finish the above repair are in the kit.

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Yamaha... | Answered on Dec 04, 2009

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