Inlet Restrictor?
 

I just ran across this article by a guy in Austrailia who talks about a restrictor plate between "carbies" and the head. Any o' you guys ever heard of such a thing?

http://www.billzilla.org/mybike.html

In early March 2007 I decided to do the inlet restrictor mod that the good people on OzFirestorm talked about, as the VTR's (as apparently many other bikes do as well) have a disc of metal in the inlet, between the throttle and head, to restrict the airflow into the engine. I'm not sure why it's there, but it reduces the top-end power of the engines quite a lot. So mine had to come out!

Ours don't have that.

They dont want people going " Mad Max" over in Oz land...

Thanks Nick
 

Nanny state is not the first image that comes to mind when thing of Australia. Mad Max is more like it!

There is a minor restrictor plate in the carb boots. It reduces the inlet diameter to the port by ~2mm.

I opened mine up to the ID of the boot. Not sure how much difference it made, but it felt good.

Actually I believe it's the same thing or similar as here in Sweden, where we have a rule for classification limiting them to <100 hp in the lower classification... The VTR coming in at ~102hp in the specs then had a restrictor put in to end up below the line...

Mine wiggled lose and fell of as soon as i could get at them... ;) And a few other bits and pieces ended up needing to be replaced, and I kind of lacked the exact spare parts...;) Well, I'm sure it runs almost as good as stock, officer... Not quite the same though...:rotf:

I had that aluminum ring in my carb boots as well. Had being the key word.