Temperature problems

clean out the condenser in front of radiator.

Degreaser, leave it for 3-4 minutes and high water pressure to clean it, don’t concentrate on one area with high pressure or you’ll bend the fins.

 

220 is not really excessively hot if you're pulling hard up hill with the fan on.

 

Shoot it with a temp gun to make sure the guage is reading correctly.

 

IDK, sounds to me like you have the wrong thermostat. But, that's from the perspective of a car guy. Plenty of experience wrenching on cars, none on a rig. So, my answer may be in left field. But, for a 4 wheeler, wrong thermostat would be my quess from the information provided.

 

I would get the themostat replaced because that is the part that controls the coolant flow in the system. if its stuck close your coolant wont flow through the radiator and hence overheating problems

 

I would check in a road test with a tech tool plugged in the intake manifold temp.
If it's too high, it will raise the engine temp too.
And I would check for how long the EGR valve stays open. 30-40%? 100%?
And I would check and test the EGR cooler flow and efficiency.
Just to start.