Post a video with you holding the throttle wide open for at least 5 seconds.
When I've had this problem it's been -
Jetting too fat (check float, then main)
Silencer broken down, (remove, can you see straight through?)
Reeds (take them out and look for large chips)
Crank seal (is the left side wet? Unlikely as it won't rev, if it's the right side your smoke will stink of engine oil)
Electrical (spark plug, then HT Coil, then stator coil, them CDI)
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear
2016 RM-Z450
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