1991 kingquad 300 carb problem

[bsfs1988]

Hey guys I think I have a carb problem. What I have done is checked compression its at 95psi, set my valves, rebuilt carb and bought a new slider diaphram old one had holes. Now I can get it to idle pretty good got pilot screw 2 5/8 out. Anything over idle its not acting right I cnt get it to hit the rev limiter. If I give it full throttle it rev a lil high then bog down then rev high and bog bck down it wnt stay a constant high rev it keeps bogging down like its either not getn enough gas or to much. When I took new plug out it was black and dry. I wonder if its a float problem. Il b getting a manual for the quad soon but til then anyone with sum pointers I will appreciate it! And I also checked timing it looked good