Alright I’ve tried everything this bike seems to not wanna start. It’s getting spark fuel and air
it pops when the starter is enguaged and dies dwn and struggles when given more gas but never actually turns over. I’ve treud and tried a lot it just stopped working one day

things I’ve tried
starter fluid
new cdi
new carb
timing
adjusted valves
cleaned sprrk plug

things I’ve replaced
head
cylinder wall(upgrade)
piston
starter
battery
air filter
ignition coil
spark plug
brand new wiring harness

note: this is a fully automatic with no kick start

 

Check the TDC mark on the flywheel is at top dead centre by the piston. Check compression is over 90 psi. If both are OK I am at a loss, as you have checked and/or changed everything else.