20 Most Recent Yamaha Ef600 Generator/inverter Repair/service Manual - Page 7 Questions & Answers

This is official site: http://www.yamaha-motor.com/outdoor/products/modeloverview/cat/2007/55/model_overview.aspx

Yamaha... | Answered on Jan 18, 2012

Now if the genset stabilises with a load but keeps shunting when there is no load it is possible that you need to do a service check or overhaul of the engine.
1. Make sure that the oil is clean , if low or clogged replace the oil.
2. Check the fuel line and the fuel/air settings . If the engine is HUNTING then there is a setting fault of the mixture or there is dirt in the carburator ports that does not allow the fuel to be flowing with the right pressure . It is best to remove and clean the system.
3. The Spark plug is another reason, if the plug gaps are low, if the spark plugs are bad, insulation is faulty the power will be reduced as it will hunt.
4. The genset RPM is monitored by a governor which allows a slight throttle adjustment when the load increases. So make sure that the linkages to the throttle vavle is free and moving.
5. the choke must be kept closed, check the spark plug to have an idea of the firing.Finally check the fuel, check for impurities in the tank.
I am sure one of the above tip must solve the issue.
Thank you for using FIxya.

Yamaha... | Answered on Sep 08, 2011


Yamaha... | Answered on Aug 27, 2011

My answer:

Hello Bill:

Here are the site links you'll need to check and/or get info, or buy your adapter kit for your Yami YG4600D Genset conversion kit.

Most likely it's running an 8 or 10HP engine on it now? In any case it's most likely less then 12HP. Not sure what size engine you have, as you didn't say only for the model #? On older Gensets it's harder to track down the HP rated engine is all.

For your Yami YG4600D Genset there you most likely will have your choice of at least 4 adapter kits depending on if you are going to keep gasoline as an option. If you're definitely NOT going to be ever running gasoline again then there are 1 or 2 adapter kits to choose from.

Use the site links below, and then browse whichever area you want as there are many options there. The last link listed takes you through all the different engines by make & model #'s.

I would also shop around locally where you are in LA, as you might be able to get that adapter kit for a lot less then the $227 to $267 they are asking for there at that site.

If you don't see your exact model # (or kit) there call them on their 800 toll free # listed at their site.

Also - if this site doesn't meet your expectations customer service wise at least you will have a starting off point with the wealth of information supplied there!


"What Kit Do I Need?"


"Simple Explanation"


A and C Kit List
Please post me a reply as to this info helping you solve your adapter kit problem there by following my posting recommendations above. Also please rate my troubleshooting fix as well.

Keep me posted and I'll follow up as well.

Best regards,


Yamaha... | Answered on Jul 27, 2011

You can safely use any ul approved device using 120v 50 ~ 60 hz if you stay within the limits of it's potential (in your case 2000 watt). You will probably have a loss of efficiency using a step up transformer and will be very limited on the wattage available at the 220v. Most converters are not designed for continuous use and recommend that you buy a converter with at least 25 % more capacity than you will use. Also to get longer life out of your generator, you should use only 75 percent of its capacity for continuous use. A 2000 watt converter will work fine for loads of about 1500 watts or less.

Yamaha... | Answered on Jun 18, 2011

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

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