Might not be a jetting issue at all. What type of oil are you running? Also does the exhaust have a funny smell?
The reason I ask these questions is this, if you are running an oil with a high flash point, such as Motul 800, and you aren't revving the bike hard the oil will cause the bike to load up with unburnt oil and cause the sputter and fouled plugs. A leaking crank seal will cause the same problems described along with a funny smelling exhaust. Burning gear oil smells way different than regular 2t oil.
If dropping the needle one clip doesn't help the problem you may want to start looking elsewhere for your problem.
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