20 Most Recent Yamaha Ef600 Generator/inverter Repair/service Manual - Page 4 Questions & Answers

Regardless of it being either a two or four cycle engine the piston rings are at fault, if not the cylinders having scratches or groves

Yamaha... | Answered on Feb 22, 2015

By reversing the polarity you could have burned out the the stater motor. Or if is fused it is blown out.

Yamaha... | Answered on Feb 22, 2015

If the fuel tank is below the carb, check for a check valve in the fuel line not seating. You can verify by shooting a bit of starting fluid in the breather. If it starts and then hesitates a bit and then runs, it means that the engine speed was adequate to suck fuel back up into the line to the carb.

Yamaha... | Answered on Feb 05, 2015

Most likely your battery has a cell or two dead oe weak. I think if you replace it you will find it working as it should. The batteries used in this gear is not of high quality. They generally fail in two years r so especially if left not maintained an go down.

Yamaha... | Answered on Jan 28, 2015

Most generators use a flyball type governor within the engine to control rpm; also there is a voltage regulator that tries to maintain voltage at about 115v. The voltage regulator varies the voltage to the armature increasing /adjusting magnetic force. Use a meter with htz or freq setting to adjust engine governor to 60 cycles. When the generator is producing 60 cycles, the engine should be turning 3600 rpm, max power range. At 3600 rpm the voltage should be 115 to 120 volts. Loading the generator will cause governor to try to maintain 3600 rpm. Check engine manual for proper adjustment of gonvernor and linkage. The governor mech should last the life of the engine, however governor system does wear out. Expensive repair. enjoy

Yamaha... | Answered on Sep 26, 2014

This sounds like a fuel supply problem. Probably gum or varnish in the carbureator. Rebuild the carb and it should be fine.

Yamaha... | Answered on May 23, 2014

Unless you are going to use this exclusevly for 240V service, this is a bad idea. Your 120V legs will float between 0V and 220V.

Yamaha... | Answered on May 23, 2014

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