Join us now!

Username
Password
Verification
	Stay logged in

- OR -

Forgot Your Password? Forgot your Username? Haven't received registration validation E-mail?

User Control Panel Log out

Reply to post

Mark Thread UnreadFlat Reading Mode ❐

Gx390 issues

Author Post Essentials Only Full Version
Soundside New Member Total Posts : 1 Scores: 0 Reward points: 0 Joined: 2025/03/09 18:26:50 Status: offline 2025/03/09 19:13:38 (permalink) 0 Gx390 issues I’ve got a clone gx390 13 hp generator. The carb developed a leak. I replaced it and now I can’t get it to start. I thought the first replacement carb might have been bad so sent it back and ordered another one. Same problem. I can sometimes get it started by forcing the throttle to minimum and holding it there. Then if I open it slowly it will run at speed for a bit then stumble and start surging and backfiring. The governor seems to be working okay. But when the engine is off, governor forces WOT. Is that normal? That seems to be causing the hard start problem. Not sure what is making it stumble at speed. This is really frustrating, since it ran okay before swapping the carb. Heeeelllp! Quote #1 1 Reply Related Threads
SRTsFZ6 Super Member Total Posts : 2033 Scores: 74 Reward points: 0 Joined: 2018/11/18 07:20:58 Status: offline Re: Gx390 issues 2025/03/10 08:07:43 (permalink) 0 WOT at throttle when off is normal. There's likely a fuel filter inside the tank where the hose connects. I would turn the fuel off first and remove the fuel at the carb (or valve) Turn the fuel back on and look for proper fuel flow. Surging would occur with a "little fuel" flow issue. I suspect that's your issue And crap got into your old carb and stuck the float open. That would cause the leak to occur with the over flow of fuel. . post edited by SRTsFZ6 - 2025/03/10 08:09:15 Scott Quote #2

Author

Post

Essentials Only Full Version

Soundside

New Member

Total Posts : 1
Scores: 0
Reward points: 0
Joined: 2025/03/09 18:26:50
Status: offline

2025/03/09 19:13:38 (permalink)

Gx390 issues

I’ve got a clone gx390 13 hp generator. The carb developed a leak. I replaced it and now I can’t get it to start. I thought the first replacement carb might have been bad so sent it back and ordered another one. Same problem. I can sometimes get it started by forcing the throttle to minimum and holding it there. Then if I open it slowly it will run at speed for a bit then stumble and start surging and backfiring. The governor seems to be working okay. But when the engine is off, governor forces WOT. Is that normal? That seems to be causing the hard start problem. Not sure what is making it stumble at speed.
This is really frustrating, since it ran okay before swapping the carb. Heeeelllp!

Quote #1

1 Reply Related Threads

SRTsFZ6

Super Member

Total Posts : 2033
Scores: 74
Reward points: 0
Joined: 2018/11/18 07:20:58
Status: offline

Re: Gx390 issues 2025/03/10 08:07:43 (permalink)

WOT at throttle when off is normal.

There's likely a fuel filter inside the tank where the hose connects.

I would turn the fuel off first and remove the fuel at the carb (or valve)
Turn the fuel back on and look for proper fuel flow.

Surging would occur with a "little fuel" flow issue.

I suspect that's your issue
And crap got into your old carb and stuck the float open. That would cause the leak to occur with the over flow of fuel.

.

post edited by SRTsFZ6 - 2025/03/10 08:09:15

Scott

Quote #2

Jump to: