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[QUOTE="RM_guy, post: 1476259, member: 20652"]
When ever a bike runs better with he coke on it's because there is a lean condition that can be caused by several things. It sounds like you hit the obvious stuff (carb jets, boot clamps, etc). When you said it's been getting progressively worse I think about stuff the wears out. You said you checked the valves but did you do a leak down test to make sure they are sealing properly? Adjusting the clearance is one thing but if the seats wear they can leak and cause problems. The bike is 4 years old and not knowing the history, I'd say a valve job is in order.

You mentioned 87 octane gas. The compression on those bikes require at least 91 octane or they will detonate and ping. One tank of gas my not have cause the problem but over time all of the detonation can cause some serious problems from holes in the piston to valve damage.

Once you figure out the problem you may want to rejet the carb. It sounds like you were chasing the issue with jetting so make sure it gets put back to where it once ran good.
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