20 Most Recent Yamaha Ef600 Generator/inverter Repair/service Manual - Page 8 Questions & Answers

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

Surging is not uncommon till warm and stable,

No power? Read this site:


Yamaha... | Answered on Nov 02, 2009

Check the Built in circut breaker.

Yamaha... | Answered on Sep 22, 2009

I'm not quite sure if your issue may relate to most inverter and auto-load sensing generators or some gas-powered equipment.
Most power cutters/grinders such as Stihl or Husqvarna, specially the higher cc models do sound crappy without load, you'd think there's something wrong with it from day 1. This is normal. Well, some of these machines lack the load sensing capability thus does not adjust throttle variably according to load.
Modern generators, specially the inverter ones along the 1000 to 3000 watt range where the Yamaha 2400 falls into category, have a switch where you can choose to let the unit sense and adjust throttle according to load. If this is off, the unit might sound like its not running smoothly on idle. Depending on you, this can be alarming or not. On a Honda EU2000is, for example, it is noticeable when the auto-load sensing button is off but not be like its choking or sputtering.
Anyhow if it is idling roughly, I can only come up with 2 possible causes, if I may suggest:
1.) the cable that gradually pulls the throttle (to open wide or close) on the carburetor - normally called governor cable (although it has different configurations on different engine types) needs to be adjusted/tightened. Or replaced, if worn out. Before new cable, put lithium grease on cable - it helps a lot.
2.) throttle adjustment might be necessary. At most Yamaha servicing dealers, it is included when you have a carburetor tune-up. They will check the diaphragm for blockage or holes, gaskets for leaks and filters, well, the entire integrity of your carburetor. This resolves most rough idling issues.
I know it would probably save you at least $65.00 if you have to check this yourself and buy the spare parts. However, going to a servicing dealer may be the best solution but always be sure the repairs are warratied. Hope this helps.

Yamaha... | Answered on Aug 16, 2009

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