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JD Gator only runs with choke
If you need the choke to make it run you need more main jet. Iam assuming you are saying that when you run it at speed it will run better with the choke pulled part way out. What main jet is in it? Probably in the 80s somewhere. It needs a 90 or 91. 42 or 45 sounds right for a pilot jet. You should be able to blow carb cleaner thru the bottom of the pilot jet using the plastic nozzle provided. End holes are much smaller than the side holes.If you have to use wire to open it up use the smallest wire in a tourch tip cleaning set.
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JD Gator only runs with choke
Bad, your jet is not metering outside air, so it is NOT open at the top. If it was it would fill up with junk constantly. Look down the bore of your carb and you will see a small inlet on the side of the bore that the pilot jet is on. You will see that inlet lines up with the jet when it is screwed in. That inlet is the source for the air that is metered at idle. Air comes in there, goes thru the large holes in the jet and is metered thru the small hole. If all that is clean, I say you need a larger main jet. The way I tell when it's big enough is go down the road wot and pull the choke out a little, if you slow down, you're ok, if you speed up, you need more jet. Make sure motor is warmed up. Put a new fuel filter in it too.
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JD Gator only runs with choke
Bad, just thinking about your "stumble" There is a spring that goes the length of the link between the governor arm and the carb throttle plate. PN M94839, this spring holds tension on the linkage and has to be fastened on both ends for the throttle system to work properly. Obviously your main jet doesn't have anything to do with stumble. Also when I mentioned blowing thru the pilot jet I meant thru the small end hole and out the side holes. If nothing else works Deere has a kit PN AM119044 that has a #40 pilot jet and 90, 92, and 95 main jets in it. The 40 pilot may help. Plus, if you are running out of gas on top I'd try a 90 main jet.
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JD Gator only runs with choke
That little screw with the spring means alot, because it is the idle mixture screw. Warm the motor, turn screw in until lightly seated then turn out 1 3/8 turns. If it has limits, start in the center. Turn slow idle stop screw so it is not touching the stop, or just shy of the motor dying. Turn the idle mixture screw in until the rpms start to fall off and note the position of the screw. Or maybe you will have to turn the screw out to start, you will be able to tell. The idea is you have to start between the two extremes. Turn the screw counterclockwise until engine speed increases and begins to fall off and note the position. Proper adjustment is in the middle of the two. Readjust the slow idle to 1050-1100 rpm. Also your valves need to be at .005 cold. When you check your valve lash make sure the rocker arm shaft is tight in the mounting holes in the head. If those holes are worn it will change your valve adjustment and create problems.
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JD Gator only runs with choke
To adjust the valves. Engine cold. Remove spark plug and valve cover. stick something long and skinny in the spark plug hole to feel the top of the piston. Hold what you are using and slowly turn the crank until the piston is as high in the bore as it will go. As you are turning the crank look at the valves, if they don't move 10 or 15 degrees before the high point of the piston you are at top dead center. If the valves are moving in that span, you are not on the compression stroke and you need to go around again. Valves are both at .005 As I said previously, check the rocker shaft for side play, also check the ends of the valves for dimples made by the rockers. Dimples will give a false lash reading. Push down on both valves to see if both have about the same resistance, you could have a weak or broken valve spring. Make sure your low idle speed is at least 1050 rpm. I think the linkage jumping around is the governor reacting to a miss in the motor. There is a governor adjustment, but it is too hard to explain. Have you tried spraying starter fluid around the intake gaskets to check for leaks? Engine will speed up if there is an intake leak. Also take a compression test after you adjust the valves. Another idea, when you had your carb off did you check the float level when carb is upside down? When upside down your float should be almost parallel to the bowl seating surface. If it dips down in the front, you could be getting too much gas in the bowl.
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JD Gator only runs with choke
I noticed that all the FE290D carbs in the Kawasaki parts book have #45 pilot jets in them, you said yours was a #42. Since we are running out of ideas, I wonder if the change would help? PN 92064-2083 Double check the number on yours. Don't know about your swap meet tach. We use the ones that have the wire that wraps around the plug wire. tinytach.com
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JD Gator only runs with choke
The spring holds tension on the linkage so the throttle doesn't flutter. This spring keeps a solid connection from the governor arm to the throttle plate regardless of how much slop is in the linkage. And yes,the spring hooks can be in the same holes as the linkage.
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JD Gator only runs with choke
Slight dimples won't affect the adjustment in the valves. One last idea from me. Check the vent hose for the gas tank. It comes out the top and runs thru the frame and comes out below the shifter. Take it off at the tank and blow air thru to make sure it's clear.
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