Re: Trottle Body problems .
Anything with moving parts is subject to wear. What the shop is most likely talking about is wear to the pins that support the butterfly valves. Rarely does any significant wear take place between the round plate and the bore of the throttle body. Yer bike is almost 10 years old,but is it a high mile'r?
The reason they have said they have never seen it before,is due to the fact that they haven't worked on many bikes or very many Busa's. Its not a common thing to see,but you will run across it working on anything with carbs or TB's from time to time.
The condition makes it hard to tune a motor because the worn part now allows air to enter where none exsisted before.
Hope that makes sense.
The red arrows I have drawn show where the TB's usually wear out and allow air past...the green arrows point to the secondary wear point where a plate has come loose,is slighty bent,etc (highly unlikely).
It is rare to see on something machined as well as a Busa...but it could happen. That or the shop could be taking "you for a ride."
Thats why I asked if you are sitting on a high miler. If you are skepital,ask them to show you the wear,there will be play between the rod that holds the four butterflys (yellow arrows) and the 4 bodies.
Hope that helps.
RSD.