Yamaha 2400 motor surging

[Boondocker]

Started up the Y2400 after the winter. Was running fine before. Starts now runs but surges a bit every second or so. It produces elect. Whats wrong? I checked the air filter and took the wire brush to the spark plug. Ideas?

[tpi]

Many times when small engines surge or run poorly after a layup it is due to fuel deposits in the tiny carburetor passages. The fuel evaporates leaving the deposits.

There's a product called Stabil to add to fuel which is supposed to help with this as preventative measure . I've found with my Yamaha generator running carb out of fuel on the last shutdown has prevented this.

If the surging continues, you'll probably need to disassemble carb and clean it.

[Boondocker]

It seems to be working its way out of the system. Never had this problem in the past, but the gen set is five years old and gets a lot of hard use. I guess I should expect things to start cropping up now and then.

[chiefneon]

Howdy!

Try running some "Sea Foam" through it. Sea Foam is a fuel additive that will help clean the fuel system and like Stabil also acts a a fuel stabilizer. I have used it with good results. You can find it at most auto parts or Walmart

"Happy Trails"
chiefneon

[JFScheck]

And remember to run the generator with the fuel shutoff engaged so you can burn any fuel left in the carb.

[azflycaster]

I had this problem with my Honda EU1000i a few years ago. Running it with eco off with some carb cleaner in the fuel for an hour took care of the problem.