Cannot get over 4800 RPM STATIC

See similar thread here https://www.rotax-owner.com/en/912-914-technical-questions/9124-can-t-get-over-3000rpm-on-my-912a2-engine

In addition to Kevin (above) suggestion, I had another thought - check your throttle movement for correct/full action.

Depending on your prop setup static (on the ground) 4700-4800 rpm at WOT with a fixed pitch prop is fairly normal. Static runs on the ground are okay to get in the ballpark, but you need to fly it to fine tune the prop pitch to achieve your final rpm specs. Since the plane sat for a long time and probably with fuel in the carbs they may need a serious cleaning / overhaul. The pistons (slides) in the carbs may be dirty or gummed up from sitting and don't move up and down within the carb properly and need a good cleaning.

Questions;

What engine is it?

How old is it?

Have the carbs ever been overhauled?

What was the last maintenance done to the engine?

Have you checked the full throttle position at the carb?

What type of fuel pump is on the engine and how old?

Is the air filter a K&N and is it over oiled?

I have checked throttle movement and I seem to have a complete and full movement on both carbs

It is a 912 ULS. It has 1300 hrs on it. Annual just done in December the carbs synchronize but not overhauled. 
The carburetors have not been overhauled. I have full throttle movement on both carburetors.  I believe it is OEM fuel pump. Nothing changes when I turn on the electric pump.  It has a K&N  filter on it which has not been overly oiled. I did a static run up and check the prop speed with the engine rpm based on the prop gearing and I appear to have a correct RPM reading. 
It also has the original fixed pitch GT prop.