cr0ft
Living Legend
I think it is defective plastic, or rather it doesn't like being heated a lot. But yes, it is also easy to over-tighten the throttle, I did that just the other day (been switching cables in and out, ordered new ones but got the wrong length so on the old ones went). The stock cables are more one piece though, harder to feel when they're just right, with aftermarket cables where the elbows are separate pieces all you have to do is gently tug on the casing and you can see when you have just a little bit of play.