My 2 Yamaha ef2000is generators will only run anything in my camper that requires power (ac,tv, or microwave) unless the choke is on about a 1/4 of the way.

The OHV engine requires periodic valve adjustment.

I guess your air cleaner needs cleaning , take air cleaner off and try it. Its starving on gas, may have water in gas tank and would cause this also or plug fuel filter if it has one..

check fuse and AVR

sounds like primery coil is open circut will need re wire

Yamaha EF2000iS Generator Service Manual download
The procedures in this manual are organized in a sequential, step-by-step format. The information has been compiled to provide the mechanic with an easy to read, handy reference that contains comprehensive explanation of all disassenbly, repair,assembly and inspection operations. Each chapter provides exploded diagrams before each disassemblysection for ease in identifying the correct disassembly and assembly procedures.

Just bought one today..and same problem i cant get it to start..tried pushing choke back in and it start

I havea PDF version but I don't know how to send it you. You may be able to download it from ths link
http://www.ownerservicemanual.com/871-owners-manual-for-yamaha-ef2000is-generator.html

clean tank fuel lines air filter and completely clean all carb parts and jets just did mine runs mint now did the same thing i also put in a new spark plug changed the oil a good once over goes a long way just take your time use a good carb cleaner like crc or gumout and check the jets they have small holes on the sides that can clog up hope this helps

Hello, I have the same exact generator, 2400 Yamaha. It works fine for my Ac, and then some. After it first kicks on, is the biggest surge. Then I have even after ac is running, I have had tv on and even used microwave. But as far as running you ac on your rv , not problem. I do it all the time. Mine is ulta quite, and 8 to ten hours run time on about a gallon of fuel. Mike

The clicking your hearing from the AC is probably just the 12 volt side of the circuit to run the AC, but it does indicate that the controls/thermostat is doing it's job, but doesn't sound like hydro is getting to AC as well as microwave. I can't imagine those being on the same circuit as far as breaker panel goes, but who knows what might have been done before you got it, unless bought new. Do you by any chance own a plug in circuit/receptacle tester, or anything like that to test for power? In the meantime, make sure AC is in off mode, then go to breaker panel & push breakers for microwave & AC, all the way off hard, then try to reset it & tell me what happens.