after a detailed inspection I found the lower cylinder was scared pretty badly so I sent them to be tidied up. I figured this was the problem with the revving issue that I discribed previously. While I had it apart I checked the reeds and all were good. I cleaned the carbs and checked the air filter. I ordered a new top end kit from Tyga and have since put it all back together.

I heat cycled it 5 times using 30:1 premix with Motul 710 and avgas. After much anticipation I took it for a spin tonight and was going to take it up to 8,000 rpm's continuing with the break in.

As it appears I am now back to square one because it still won't rev past 7,000 rpms.

When I had it apart I checked the PV and they moved freely with absolutely no sticking.

Where should I look next? It has stock pipes with stock jetting and Tyga canisters. When it hits 7k it sounds just like a rev limiter on a 4 stroke... as if it's cutting spark or something.
Could it be a/the coils?