Two Part Question

I just got this 2002 WR426F about a month ago. I have heard by many people that Yamalube oil isn't that great, if this is true than what brand of oil should i use?

The owner how had it before me had cut the gray wire and taken the plug out of the exhaust and the air box lid is off. The bike pops a lot on decile and kind of bogs when you are at idle and gas it. Is this a jetting issue? or is it to rich or lean?

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