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I know this isn't your issue , but do not ride that bike without checking the cam chain tensioners, they waste the oil pump , and it will get REAL expensive from there, trust me I know first hand.
I would guess the other thing is the in tank fuel line, it costs about $150.00
With the bad exhaust smell I would almost think vacuum leak. If the intake manifold has been off recently, the seal(s) could be leaking or it is not tight.
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