Even though you have a spark.....Change to a brand new plug of the same #......
One of the first things you learn owning a 2 stroke is.......
Just because the bike is showing a spark doesnt mean the plug is good.
Clean the air filter and a new plug and you should be in good shape.
Also a little tip on 2 stroke pre mix. The cheaper the oil you use the more plugs your going to foul. Cheaper oil needs more of it per gallon and if you are not riding it WFO all the time the cheap oil will build up on the plug and foul it. I use Motul racing premix at 50:1 ratio and have not fouled a plug since 1988 and that is the Gods honest truth.
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