Running terrible missing sputtering only 30 miles on it

what eng size does it have ?

It looses power because it is so heavy. I am not sure about the ground clearance on those but it may be bottoming out also...

Check the air cleaner and any ductwork for blockage. (Mouse nest?)

Inspect the fuel system. If the fuel line is out of place and too close to the exhaust or cylinder head, the fuel may be boiling inside the line so you don't get proper flow to the carburetor (this is one possible cause of vapor lock).

Is the choke actuator part of the new carburetor? Verify that the choke is opening when the engine warms up. If it is an automatic choke, inspect the vacuum line and thermostat controlling it. Try removing the vacuum line from the choke actuator and plugging it when the engine is warmed up, then see if the engine keeps running. If it does, the actuator diaphragm leaks when the choke is open.

Check the exhaust pipe for blockage.

If the engine has an EGR system or PCV valve, check those for proper operation. If carbon deposits cause abnormal operation of the EGR valve, the engine will kill when the valve opens too much (about the time the engine is warmed up).

If everything else is good, check the exhaust manifold for blockage by carbon deposits.

Your jetting and adjustment is not right for that level . The Dealers should know that and adjust it for your level . It can also be your heat sensor what are not working correct anymore.

I remember the recall was for hawkeyes sold to people living in high elevations. you probably just need to clean your carb.

clean the filters on the petcock?

take it back

Adjust the fuel idle and the accelerator cable.

sounds like its running rich. check your float height and then lower your main jet needle a notch