OK This will be boys who know the deep secrets of these mini quads!
Eton 90r 2stroke
Everything installed:
Hetricks -Bkit with everything that is included
-52mm port & polished cyl.
-Tether kill
The Problem
Son was racing at Lorretta Lynn's GNCC and obviously went thru some mud/water and also he said, had it roll over 1-2 times in the woods. ran 2.5laps and then started sputtering and then slowed down and let out a big puff of white smoke and then died and wouldn't restart. after getting it home I cleaned up the carb/jets/ports full clean job, no dirt in reed cage area. started right up but wouldn't rev strong past about 3/4 to full throttle sitting in neutral or under load. it revs then cuts out quickly then back into rev. almost like a soft rev limiter.
Here is a list of all I have tried

checked comp- 90-95 with carbon fiber reeds, 115 with fiberglass reeds
honed cylinder to put cross hatch back in it
cleaned carb/ports/internal parts 3 times & Air filter
rejetted up and down
changed out with new stator & coil
removed Hetrick spark box used just Stock CDI
removed Stock CDI used just Hetrick box
checked with inline spark test that you hold on outside of plug wire- checked at all different rev areas
cleaned and regreased elec connections
checked kill switches
bypassed kill switches
bypassed all electrical from stock wiring harness that i knew of
ran extra grounds to coil and engine
Sprayed carb cleaner around seals,cyl., carb/intake, no rev up's.
checked float to see if running out of fuel

Is there a bank angle sensor in these that maybe was tripped and has not reset?
I am pulling my hair out!!! Please help.
Thank you!