It sounds as if the engine is running lean.
Hi and welcome to FixYa. I am Kelly.
This is how to clean the fuel passages in the carb.
Here is what you need to do:
1. Fuel selector off
2. Remove float bowl mounting screws and nut
3. Remove the BRASS Jet / Orifice in the very bottom of the venturi tube inside the pickup tube. (Flat blade screwdriver) Hold the Orifice up to the light. You should see a pinhole. If it is not clear clean the orifice but do not force anything through the hole.
4. Underneath the Orifice there is yet another BRASS tube that you need to remove. (Flat blade screwdriver) Make sure all of the holes in the tube are clear. The tube will be over 2 inches long. Clean it and reinstall it.
5. Reinstall the Orifice.
6. Using a catch fuel container turn on the fuel selector. Fuel should flow at a good rate. GENTLY lift the float assy level and make sure fuel flow shuts off. When you drop the float again fuel should flow.
If you do not have fuel flow at this point the needle and seat will need to be inspected. Fuel selector OFF.
(The following procedure is to be done only if there is no fuel flow with fuel selector on.)
a. Remove the silver float pivot pin retaining screw
b. Drop the Float down (The needle will come off with the float. NOTE the position)
c. Inspect the tapered rubber of the needle If should be pointed. If it is not pointed then the rubber tip is stuck inside the seat.
d. Clean the seat hole ONLY if obstructed. (Easily damaged)
e. FUEL Selector on then off fuel should rapidly flow through the needle seat.
f. Renistall Float and needle making sure to get the pivot / hinge pin installed correctly and reinstall the silver retaining screw.
g. Fuel selector ON. Raise and lower float checking for free movement and fuel flow.
7. If there still is no fuel flow at this point remove the fuel hose from the carb and check fuel flow. If no flow check that gas tank exit hole, fuel filter (if installed) and the selector valve assy for obstructions. Reassemble connections.
FUEL FLOW IS GOOD
8. BEFORE you install the float bowl inspect the bowl nut. There are 2 holes in the side of the nut where it screws in to the bottom of the carb that must be clear.
9. Install Float bowl mounting screws and nut. Check for leaks.
10. Test engine.
That should do it. (carb cleaning 101)
Thanks for using FixYa.
Kelly
My first answer could have been wrong.
The G18 according to Kubota can either be a diesel or gas powered lawn tractor. (2 Different engines) You did not say which one you have.
Under power in a diesel can be caused by:
1. A dirty fuel filter
2. Low fuel pressure
3. A poorly performing injector pump
4. Dirty injectors
5. OR valve seat blow by from under compression. Under compression would make the unit hard to start so I doubt you have an under compression issue.
I do not know of an on-line source for the manuals below:
The service manual number is: 97897-10835 and was superceded by a newer manual 97897-10885
The manual price varies from $66.00 to roughly $25.00 depending on source.
Parts list manual number is: 97898-41271
Operators Manual: K1310-71223
Kelly
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Almost certainly the fuel filter. There are two, one on the engine but the first in line filter is under the rear left hand wheel arch. Just fit a new one, but check you put it in correctly, there is an arrow on it indicating direction of fuel flow. It should be from rear to front.
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