Question about Yamaha EF2400iS Portable Generator

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Ef 2400 Is Yamaha generator Over Revs

Smart throttle does not respond correctly.Idles perfect when I start it. As i put it under small load it idles down instead of up, when I use like a hair dryer it comes to life and over revs until i choke it out or shut it off. I have cleaned the carb the speed limiter motor on top of the carb still no luck. I put a new carb assembly on thinken this would fix it and no luck . If I unplug the smart throttle and manually operate the carb by hand the Generator itself works and runs fine. I have checked wires for short and loose conections. The first problems with this gen started with surging then over time got worse .

Posted by Tracy Whitaker on

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Myron Scharkey

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  • Contributor
  • 25 Answers

Take it to a dealer, there is a solid state module inside that controls the charging and idle, also a wiring diagrams are available with owners manual, go to Yamaha web site also..

Posted on Apr 15, 2017

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Anonymous

  • 90 Answers

SOURCE: 2002 suzuki LS 650 running lean at higher speeds, (off idle)

this prob happens allways in carburated engines that the car or motorcycle is running lean or rich . because the air - fuel mixture ratio is not right . so you should open the carburator and remove the air filter you will find two screws in the lower front section of your caeburator. you can adjust them by a screw driver until your car is smooth

Posted on May 31, 2009

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Anonymous

  • 60 Answers

SOURCE: Poor throttle response below 4,000 revs.

The carbs need to be re-tuned for the exhaust. It doesn't seem like like it needs to be rejetted just idle mixtures adjusted. this would be something that a mechanic should do because there are four carbs and they need to be syncronized with each other

Posted on Jun 24, 2009

Eric Schultz

  • 70 Answers

SOURCE: 400 Eiger ATV, starts and runs fine, stalls the

If 2 stroke check crank seals, check plug cap for proper resistance,check for good fuel flow to carb.Spark should jump at least a 1/4" gap,NOT JUST the .030 or plug gap.

Posted on Sep 08, 2009

ollie reece

ollie reece-jones

  • 1167 Answers

SOURCE: RM85 w/ 105 kit bogs down with rapid throttle onset rate

hi buddy set the needle clip to its normal condition and also on the carb is the mixture screw you need to turn this all the way in and out 1 turns and try this you will always get a bog if you rev fully too quick i had this problem with my kx85 and it was just this hope this helped mate i will send the pic in a mo

Posted on Sep 17, 2009

Testimonial: "Appreciate the help. I've been all over w/ the air mixture screw. Still smokey and bogging down."

wayneman01

Wayne Thomas

  • 301 Answers

SOURCE: Keihin CVK-D36 carbs on a 20 yr old ZZR 600

It sounds like your bike has been sitting in storage for an extended period of time (a year or more) - and the carburetors are plugged up. If this is the case, they will need to be completely disassembled and cleaned out.
If it hasn't been sitting (and the carbs aren't plugged up) then check that all of the normal tune-up items have been performed, especially valve adjustment, oil and filters, spark plugs, etc. If this fails to produce positive results, perform a compression check on the engine. Each cylinder must be able to produce at least 140 psi of compression in order to run and idle properly.

Posted on Nov 07, 2009

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Have been working on a 2008 zzr600, and the bike idles perfect in neutral but once under a load it becomes hesitant when given throttle. I have put fresh gas in it, replaced fuel pump, replaced thrott


You idle jets may be adjusted correctly but other jets may need cleaning out. Also check float height. They may be too low and cause hesitation under load

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There is something wrong with the auto load sensing switch which is part of the generator. That is the sensor that detects when current load from the generator drops as in when you strike an arc or turn on a power tool and cranks the throttle to full power. It is obviously working on manual because the manual switch is cranking the revs up so the solenoid that operates the throttle is ok. My advice is to take it to a service centre that deals in welder/generator sets as you are playing with dangerous voltages and may possibly damage the machine by tinkering with it or fry yourself (nasty)

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Cleaned carbs on 1989 Radian 600, now idles at 6-8K RPM. Please help.


Please check the following:
- Throttle control cable adjustment.
- Foreign matter in throttle plate.
- Fuel line clogged.
- Water contamination in fuel.
- Vacuum leaks in the intake manifold or at the carburetor.
- Carburetor base gasket or seal.
- Air/ fuel mixture adjustment.
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How to fix surging on yamaha 2400 generator


If may be a partly blocked main jet ( Check by slowly closing the choke), if it the hunting clears out as you slowly close it it prob blocked main or pilot jet...
If the unit hunts (flutter)at 1/4 through 3/4 load, the governor damper spring on the throttle shaft under the stepper motor needs one more turn.. only after you've checker the carby..Only one turn or you will damage the stepper motor....one a few of these....

Jan 26, 2013 | RTO New Yamaha Inverter Ef2400is / Yamaha...

1 Answer

My EF2400iS surges under low loads. Seems to smooth out with larger load. Any suggestions? Throttle motor or control box?


Idle speed screw may need adjusting slightly to increase idle speed. Also Main jet and Idle mixture Screws may also be out of adjustment

Aug 23, 2010 | RTO New Yamaha Inverter Ef2400is / Yamaha...

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Slippage


souinds like a worn clutch to me, or badly out of adjustment

Jun 29, 2010 | 1981 Yamaha XJ 650

1 Answer

Coleman Powermate 1000 Starts fine then revs up and dies


Hi, I just pulled out my Coleman Generator (1000) and it actually started then died. Has been sitting for about 10 months. I ran it out of fuel before putting away. Anyways, it starts for a minute than dies. If I press fuel primer it keeps running but than it dies. So, I took the cover off, the one towards exhaust side and was able to see carburetor. There are two screws with springs on them. I guess these screws control fuel and air for carburetor(you can clearly see they are on carb). As stated above there are not many adjustments. There is no choke for the model I have; just an on and off switch and fuel prime button. The instructions say fuel it up (with the right oil/petrol mix of coarse), switch it to "on", prime it, pull starter cord and then that's it......"not happening". Okay, so I took my little flat head screwdriver and backed out each screw while counting how many times I turned, until I was able to remove completely(PLEASE remove one at a time and take note which one went where AND how many times you backed out). Take a can of carb cleaner with the straw and shoot through the holes where the screws came out of. I shot carb cleaner a couple pumps in each hole. Examine each of screws removed as these have pointed ends(replace if damaged). Put screws back; again make sure you count how many turns. This worked for me. Idles perfect. Thanks!

May 14, 2010 | Coleman Electrical Supplies

1 Answer

Engine idles perfectly and revs fine while in park. Under load the engine cuts out hard while accelerating at about 2000 rpm. Recently has had new throttle body, checked vac lines and actuator on air...


ur having fuel supply or poor electrical supply problem thats why the engine cuts off underload/ check spark plugs or airflow meter condition as well....

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1 Answer

My yamaha 2400 gen.does not run smooth at idle, but under a load it runs fine.


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.

Aug 16, 2009 | Yamaha Electrical Supplies

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