Hi guys
Do any of you know what the air screw should be at on a 2000 traxter 500? It seems to run and idle good but is kind of gutless on top end. I can only get about 45 mph out of it. any help would be great thanks to all

 

Mine is not very fast either. Top end really sucks since I put the super swampers on it.

 

The reason I am asking is from the time it was new till about two weeks ago it was able to get to about 58-60 mph. Now it just seems to be running very rich on the top end. thanks for any help.