I have a 2016 Mahindra emax 22. Was running fine, slowed to a very slow speed. It stopped and won't start. Thought it was the fuel but had a 1/4 of a tank. Topped it off but still won't start

This seems to indicate oily fan belt (4) - needs adjusting or replacing (3).

https://tractormanualz.com/mahindra-blink-codes/

Videos and Manual

https://www.google.com/search?q=mahindra+emax+22+blink+codes

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Check for loss of power (voltage) at stop solenoid (on fuel injector pump).

https://parts.mahindrausa.com/dealerview/illustration.aspx

On some float-type carburetors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle. If your carburetor contains these screws, proceed below.

1. With the engine off, remove the air filter and air cartridge.
2. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns.
3. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. Then, turn the screw counterclockwise 1 to 1-1/2 turns. Replace the air cleaner assembly and start the engine for final carburetor adjustments.
4. Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow . Finally, turn the screw back to the midpoint.
5. Using a tachometer to gauge engine speed , set the idle speed screw to bring the engine to 1750 RPM for aluminum-cylinder engine or 1200 RPM for engine with a cast-iron cylinder sleeve.
6. With the engine running at idle , hold the throttle lever against the idle speed screw to bring the engine speed to "true idle." Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture .

Yes, the blower motor is bad, replace it. This is exactly what you say, brushes are worn.

Only Info I see is "Homelite Chain Saws" - not much to go on.
Most saws have two carb adjustment screws, Hi, and Lo.
Assuming the saw will start and run enough to warm up, then
adjust the Lo screw in, clockwise, until the motor starts to slow down,
turn only about 1/8 turn at a time. From the point where it starts to slow down, turn it out about 1/4 turn. This should give you a decent idle. Now pull the throttle, and see what happens.
A - Saw runs up to speed, but dies off, or starts to slow on it's own.
turn Hi idle screw out about 1/4 turn.
B - Saw speeds up, but runs sluggish, fat - not real hi end.
Turn Hi screw IN, about 1/8 or so, and try again, or adjust
while running at full throttle. (best way)
IF it won't run well, try turning both screws all the way in to seat them, then come back out about 1-1/2 to 2 turns. this should get you in the ballpark to set things up as above.

Once the saw is running well, adjust the idle screw to a smooth idle but slow enough that the chain stops moving.

Stay safe

Just a thought, if you are running ethanol fuel it will lower the bikes idle speed. If you run no ethanol fuel your idle speed will go up. Turn your idle screw to raise the idle . Hopefully , your problem is just that simple.

Got a 1/2" or so bolt head on bottom of bowl at carburetor? If yes, carefully loosen it, remove it, lower bowl & look for debris in there & clean it out. careful with small gasket around it.

why dose my motor cycle up & down in rpms

Try to clean the fuel system and inspect the fuel senser and injectors, it sounds like there is fuel stavation which can't allow the car to move at high speed.

have you changed the fuel filter lately a plugged fuel filter will cause this concern
did the power loss start all of a sudden or did you start losing power over time ?