I called Yamaha corporate and the person I spoke with had no idea of this problem, AND had no part listing for this item, he kept referring me to an "authorized dealer" for more info. I also did what I think was a fairly extensive online search and found little info, and NO replacement part. I think I am going to take ours off, clean with carburetor cleaner and replace, probably do this with the oil change.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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