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I've got good spark. Carb settings are:  H. 1/8 turn out.  Low is 1 full turn, based on Walbro factory rebuild instructions

Bought the kart for my grandson to step up from the yard kart. He was power sliding it since he was 5🌝
Previous owner said hasn't been started for "several years". 
I've drained the tank, filled with 50/1 mix
Initially disassemble the carb: all parts looked good, cleaned in ultrasonic unit, but still no start.
Bought new kit,, installed all new diaphragms etc, no start
will fire with a shot of premix into the air cleaner
New plug ,  got good rich fire
Compression test reads 60 psi
Plug looks "wet" after attempts to start
I note that the H needle does not have the o ring, washer that shows in manual ( did not come in new kit either)
I'm new to these little 2 strokes, but pretty experienced wrench over all
Any thoughts?   
Located in Southern In.