Question about Multiquip GA25H 25kW 120V Honda GX160

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My honda engine is idling up and down - Multiquip GA25H 25kW 120V Honda GX160

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Hi and welcome to FixYa, I am Kelly
I understand this is a 2200 / 2500 W generator with an automatic idle control and that you have a 5.5 Hp GX160 engine
Perform the following:
1. Turn off the fuel selector
2. Remove the float bowl nut and bowl
3. Dump the bowl contents
4. In the threaded area where the bowl nut screws into the carb.... there is a Brass orifice. Use a thinner than usual standard screwdriver and remove the orifice / jet. As you look at the screwdriver handle inverted rotation for the jet removal will be clockwise. There s a pin hole in the orifice.... clean-out the pin hole but DO NOT poke anything into the jet hole and make it bigger. Just clean it thoroughly. Hold it up to the light and look for the pin hole after cleaning.
5. Before reinstalling the jet / orifice spray carb cleaner up into the hole your removed the jet from.
6. Also before installig the jet... briefly turn on the fuel selector and watch for fuel flow from the float needle area with the float DOWN. Gently raise the float with one finger to horizontal and make sure the fuel flow stops. Then make sure fuel flow starts again when lowered. No fuel flow here = problems from the fuel tank outlet to the fuel mainifold on the carb. (can be a clogged fuel filter if so equipped) Also some fuel selectors have a mini-bowl under them. Unscrew the mini-bowl if you have one and remove the debris. Pull the hose off the carb fuel manifold fitting and check fuel flow again by briefly turning of the fuel selector. If you have fuel here and no fuel at the float needle then the manifold is clogged and you will have to remove the float and needle then spray carb cleaner into the float needle hole watching for carb cleaner to shoot out the fuel manifold fitting.
Reassemble float and needle along with reattaching the main fuel hose to the fuel manifold fitting.
7. Reinstall the orifice / jet.
8. Reinstall the fuel float bowl and nut.
9. Fuel selector on and check for leaks.... min 1 min pause
10. TEST engine performance now.
11. If the problem persists then the most likely suspect is the automatic idle control assembly. For troubleshooting... grip the governor arm and hold it steady to see if the engine maintains a constant speed. If by holding the governor arm still you have a constant engine speed; you have a bad automatic idle control.

Unless the automatic idle control is failing....the cleaning procedure above usually brings them back to normal operation.

Thanks for choosing FixYa,
Kelly

Posted on Apr 06, 2011

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