Can we get some more basics on this scooter?
Service history, if any.
Miles?
Wrecked?
Flood damaged?
KILL switch?
Tried starting with known good battery from other LIKE? Some EFI'd scoots need very good battery.
It seems to me that there are a number of things that could make your scooter run poorly (plug, gas, etc.) - but fewer that could prevent it from starting.
That injector reading makes the injector suspect, true. They run about $70 I think. But it could be partially clogged, or is malfunctioning. Is it attached correctly, snug, with clip, holder & O ring, etc. in place?
Brake switches operating correctly - seeing a good brake light when squeezed? (cheap part that stops a lot of scoots from starting)
Have the valves been adjusted correctly? (lack of compression)
Have you seen a good spark with plug against frame?
Tried starting with gas cap loose?(doubtful)
Looked for intake air leak? (throttle body area, everything snug)
Doubt if it's the aircleaner - these things never get dirty on a LIKE.
You could swap over the throttle body assembly (with the ECU) from your running LIKE200i to rule out that issue. That 12 code may have been from the throttle body/ECU unit.
My suspects would be, in order :
battery
Brake switches
check for good spark
valve adjustment
injector clogged or bad (swap one from good scooter to rule out)
throttle body/ECU assembly (caution, the eBay seller wants as much for his used as a new costs)
please keep us in the loop.
Regards, Stig