quad was running good until one day it bogged down and stalled like it was out of gas, gas was low but not empty, put gas in and it started and stalled a few times and will no longer start. Put a new spark plug in has spark, fuel and compression is 120

 

Probably pulled some dirt through from the bottom of the tank. Clean the carb out. No rebuild kits, do not remove adjusters or alter them, just remove jets and blow them, and the holes the came from, out with compressed air. Check you can see through the jets, re-assemble.