Question about Yamaha 1,000 Watt Portable Generator #EF1000ISC

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It lobes with or without load. Cleaned airfilter, drained float bowl, checked oil, fresh gas

I have a Yamaha EF1000is generator and it lobes. I cleaned the air filter, checked oil, and plug. I drained the float bowl and put fresh gas in it. It has aprox 8 hours use on it.

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Try the filter in the gas tank.

Posted on Apr 24, 2009


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I have a EF24000is yamaha that stalls when a load is put on it

Hi, Raimo and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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1 Answer

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Gap the plug at .030 What is most likely the main problem is whatever gas sat in the carb. Even with fresh gas there will be some old gas still in the float bowl. You may be able to drain the bowl and be OK but I have a feeling that the carb will need to come off and be disassembled and cleaned properly. You can try spraying carb cleaner (I dislike starting fluid as it is too volatile and carb cleaner does just as well in this instance) into the carb/intake. Remove the air filter, open the choke, and spray the carb cleaner in through that way if possible. You can actually keep an engine running by spraying with short bursts. Even by just spraying once you should be able to get the engine to start. If it does start but then will not stay running without spraying more into the engine then it is a carb problem.

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Sound`s like your not gettimg fuel. 1 take fuel line loose from carb. (have a bolt handy to plug gas line unless the gas is old then drain gas into a suitable container for disposal.)2nd take fuel bowl off of carb. should be 1 bolt thru the bottom holding the bowl on. Be carefull not to tear gaskett. Float assy. should drop down,but should not fall out. 3rd take aresole can of carb. cleaner with the straw attached and clean the float bowl, the float area. watch for over spray onto painted area,wear glasses to protect eyes. wipe off overspray as soon as possible.4th clean jet,place straw i,nto small metal tube that looks like a part of a metal inkpin located in the center of the float comming up from the bottom. 5th,open the choke/throttel plate inside the large opening in the carb and spray that area if you can see any metal trubes in that area place the straw into that and spray.Re assemble in reverse ordear that you took it apart. Be sure to pay attention to the gaskett or you will have leak`s. rre fill with fresh gas should start and run. If you do not use equipment every week then you may want to put a gas additive into the gas tank to help prevent this from reacureing. I use a product called Sea Foam Good Luck

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Used once and it ran fine shut it off and wont start even with ether. Changed the plug checked the spark which is fine. Drained gas put all fresh gas in Generator was slightly tipped up and found oil on...

If this unit was tipped over and you found oil in the air filter, there is a chance the oil entered the top of the piston as well. Never lean a engine over. If you have to make sure the spark plug is facing up, that way the oil stays in the cranckcase. If the plug has oil on it then the oil has entered in. Do not use ether. This will do nothing but damage your piston and rings. If you do not have any oil on the plug, are you getting any fuel on the plug? If it is dry it sounds like you have a jet stopped up in the carburator which is not letting fuel to go through. Or it could be the needle on the float is stuck. If so, turn the fuel off, drop the bowl and inspect for these problems. This is a common problem with small engines that are not used very much. They sit up and the old fuel causes the problems. If it is old fuel, drain it out and add fresh fuel before trying to restart. But get that carburator checked and it may need a good cleaning. Good luck.

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