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Carb Issues

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I bought a used 99 YZF400 with FMF exhaust and Uni filter.The bike runs well, but sometimes the idle kind of "wonders",or revs up when you pull in the clutch.After proper jetting and adjustments,it still does it!So next I dissassemble the carb to find the problem.And I do! It's the slider plate that is on top of the throttle valve,and it's cracked! Yamaha calls it a "valve needle" part#4FN14546-00-00 and it's $80! So my question is-Is this a common peice that wears out? Is there an aftermarket one? Has anybody else had this problem?

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