MF230 not starting

I inherited my grandfathers 1976 mf 230 and a small
farm last year. I am a newby to working on tractors. I
had a lot of problems last year with it quitting. Found
out it was rust in the tank clogging up the fuelline . I
had the tank professaly redone. I replaced the fuel
line, fuel valve and added an additional clear fuel
filter. I also changed plugs, wires, oil, oil filter and
greased it up.
My first drive to bush hog and it quit. After changing
ignition coil. I found out it was the points spring had
broken. So I changed it and the condenser and it
fired right up.
When I was continuing to mow my first path the
rpm's was dropping from 2000 to 700 or less and
acting like it was going to quit. More or less I had no
power when the motor had a load on it.
Someone told me it was probably the carburetor
needed cleaned. So I removed it, to my surprise it
really didn't look at bad inside. I cleaned it with a
can of carb cleaner and sprayed out the jets. I used
new gaskets put it back together and back on the
tractor.
Now the tractor will not start. It even back fired like
shotgun. It scared my almost to death. I double
checked and the ignition coil and their was good
solid blue spark. I feel like it is the carburetor.

Any ideas? I really need to get this going. I have
worked on it since February and I am frustrated. It
was starting up and idling so good till I removed the
carburetor. I really need some help. Please and
thanks in advance.

I would say the governor is not working properly.

Would this keep it from starting now?

Would this keep it from starting?

Since it's not starting I'd look into the carburetor again. Take it completely apart, there is some small holes, and passages that can be clogged up because some of them or so small. I use torch tip cleaners to make sure all the hole are open. Just spraying it out with carb cleaner won't get all the little holes un-blocked.

first remove the breather hose from the carburetor,then turn the gas valve on and watch the carb for a while to see if it starts to drip gas,if it does it will flood the engine wetting the plugs which will cause the no start problem and can sometimes cause a backfire, the plugs will need to be cleaned and dried,if no dripping of gas was observed the shut the gas off remove the carb fuel line placing a container under it,turn the gas back and check the flow for a couple minutes to see if it is consistent,if not check to rest of the fuel system,if it's ok shut of gas reinstall fuel line to the carb then remove the carb drain plug if it has one or the plug under the main jet if equipped turn gas on again watch for consistent flow,if no flow is observed then the float or needle valve is sticking or adjusted wrong also some of those carbs had a filter screen on the end of the fuel line adapter fitting that screws into the carb that can stop up,if it passes these test your carb is ok for now,next go to your ign system start with making sure you have voltage to the coil with the points open, then you start testing toward the dist for voltage then fire from the coil toward the plugs

gbs has you covered on the carburetor. If/when you get it to start and run I have but one thing to add. If the fuel line has not been previously modified, the line dips under the oil filter and back up to the carburetor. The path that the line takes makes for a real potential for vapor lock in the line. If that's the case, consider re-routing the line so that there is no "P" trap in the fuel line.

I could really use some more help with my tractor. I took the carb off to clean it and it has never started again. It has a solid stream of fuel from the fuel line and when I take out the drain plug in the bottom of the carb bowl. I put a small screwdriver in the drain hole. I could feel the and here the float moving. So I don't think it is stuck. I removed the air intake and tried to start it up. It has spark at the plugs I removed each one of them and can see a blue spark. I am not sure where the issue is at. I really think it's the carb just cause it was running before I removed it. Any help is greatly appreciated.

Did you take the inlet fitting out of the carburetor, it has a screen in it to keep junk from getting into the carb.