Any time the premix ratio is changed it will slightly affect jetting. Say If the bike is jetted for a 40:1 mix it will run leaner if you run it at 32:1 because there's less gas getting into the engine because there's more oil mixed in the gas. It's not a huge difference it does make a difference. Pull your stator cover and see if there's alot play in the crank. The seals usually don't go bad unless the bearings are going away or if you get a bunch of dirt or junk up into the stator and it finds its way into the seal. Have you pulled the bowl off the carb ? Maybe there's some junk partially blocking the main jet.... Could be lots of things, you just need to check stuff out until you find something.
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