First, the GXV120 and GXV140 carburetors are slightly different. The biggest difference is that the GXV120, like the GXV160, has a fuel tap built into the carburetor. On the GXV140 the fuel tap is separate, further up the fuel line. A second difference is that the drillings in the emulsifier are slightly different. The main jet is the same.
Mark, the way you clean carburetors will not work on Hondas, though it may on Briggs engines. Honda's Keihin carburetors form hard gum deposits, particularly in the main jet and emulsifier, that will not be affected by soaking in petrol. Even soaking in carb cleaner will only soften the gum, not remove it. I've also tried using an oxy torch tip cleaner - it has very little effect. You need to blast carb cleaner through every one of the holes, then follow with a tip cleaner or the correct size of jet drill bit (the drill bit is better of course). Here is a video showing how to do the job properly:
Having said all that, the problem you have described is not due to gum in the jets, unless the main jet is almost plugged. It sounds as if you have a fuel tank, fuel line or needle-and-jet obstruction that will only pass enough fuel for the engine to idle. I suggest you just remove the drain plug from the float bowl, put a cup under it, and observe the flow rate of fuel out of the drain port, with the fuel tap turned on. If my guess is correct, after draining the float bowl it will just drip out.
Last edited by Bruce; 13/08/1709:18 PM. Reason: Corrected Youtube
