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Anybody had trouble with Motion Pro throttle tubes?

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I just replaced a broken throttle tube on my YZF with a MotionPro Unit and it binds. It just sticks wide open. I noticed that there is slight ridge along the centerline of the new tube where apparently two plastic pieces are molded together-it may be rubbing causing stiction. Is the type of lube critical for this application? I am using Honda White lithium grease. Is there a way I could increase the return spring presure to overcome the stiction? The manual is no help here. Please help, I have a race this weekend and this part took a week to get here special order. :cry:

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