20 Most Recent Yamaha Ef1000is Gas-powered Inverter Generator Questions & Answers


Make sure there are no vacuum leaks on the engine manifold side of carburetor. There are 3 o 4 pieces on the engine side so inspect well.

If no leaks on engine manifold side then likely there's a blockage somewhere in the carburetor high speed circuit. Most economical solution is chinese knock-off for ~$20 US delivered.

If you can't find a cheap replacement then you'll need to do a deeper clean of carburetor by removing welch plugs and submerge in carb cleaner. You will need new welch plugs (kit) and likely kit will cost more than a knock-off carb.

Before tearing down carb, you could try Seafoam fuel treatment... probably less the 50:50 chance it will clear.

Yamaha Ef1000is... | Answered on Mar 07, 2019


Start by replacing fuel. Completely drain the tank and carburetor fuel bowl. Do not use what fuel you may have, get 2 gallons of fresh fuel from gas station. If problem clears then likely water in fuel.

If still backfires with fresh fuel then likely an ignition issue. Failing ignition module or possibly a sheared flywheel key. Try reducing spark plug gap to .025" .

Yamaha... | Answered on Oct 13, 2019


Mybe the problem is the frequency.
Visit the website www.dieselgeneratortech.com to get more support.

Yamaha... | Answered on Oct 09, 2019


There are several types of overload to consider:
A. Catastrophic: something has gone very wrong. There may be a phase to phase short or two shorts to ground. This assumes you have an ungrounded system. With luck the main circuit breaker will open without destroying itself;
B. Steady state over current: The load on the generator is greater than the rating on the circuit breaker. Time to parallel in another generatoror shed load;
C. Transient over current: Suppose you were running two generators in parallel and one failed. The remaining machine may experience an over current condition that causes the breaker to trip. You can also have transient breaker trips upon activation of a large motor e.g., fire pump or bow thruster;
D.Thermal: There is a big difference in sea water temperature as you travel the world. It is possible to have an overload caused by the diesel engine's inability to shed heat in the tropics. Continued operation could damage the diesel engine. Again, parallel in another generator or shed load.

Yamaha... | Answered on Sep 30, 2019


Is it overloaded? That's the most common reason!

Yamaha... | Answered on Mar 24, 2019


4 stroke engine?? syn 5w30 or straight 30w

Yamaha... | Answered on Aug 27, 2018


Remove the cover, and take off the broken cord, replace it with new.

Yamaha... | Answered on May 20, 2018


Check oil level and cooling air flow past the cylinder. Are there foreign material like leaves in the air intake?

Yamaha... | Answered on Mar 17, 2018


It should be stated on the id plate.

Yamaha... | Answered on Feb 21, 2018


Probably find that the carburetor jets are a bit clogged. Remove and soak in carburetor cleaner and then blow out with compressed air. Or alternately get a very fine drill set and clean, but be careful if choosing this method. Also clean the air filter. cheers

Yamaha... | Answered on Feb 19, 2018


You may find the following documents helpful for troubleshooting and parts. I use www.arcolawn.com for parts but any reseller can assist you. This model does have an adjustment on the AVR behind the main panel but please review the below manuals before adjusting. Material Number Manual (PDF) 0H4099 EV C/PNL 410 XG PORTABLE 6.5KW 0H5145 WD SD 8.0KW XG ES 0J1587A EV XG8000ES 49ST 0J2873 EV XG8E 410CC 0J4651 MANUAL LOWES XG8000E 0J3335A WARRANTY STATEMENT EMSN E1 P3

Yamaha... | Answered on Feb 13, 2018


voltage regulator not producing volts for the exciter windings of the alternator

Yamaha... | Answered on Jan 16, 2018

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