NO revs over 5K

[GorillaSkinz]

Did you ever figure out the problem? What was it?

[FastCletus]

Yes issue was timing.  I had it retarded too much.  Runs great now.  and has for 6 +months

[cblover]

In my experience it could be these 3; Carb setting or may need some cleaning, fuel pump or ignition system w/c is very common as you stated.