For future reference, don't forget the web..and your friend, google.
From:
http://www.boyesen.com/cwo/OFFROAD/FAQ#2
Q: What are Rev-Plates?
A: Rev-Plates are the thin metal strips that are intended to be used, instead of the stock reed stops, to mount the reeds to the reed block. They allow the reeds to open freely and function efficiently.
Google search: Boyesen reed installation stops
Also, from the same search:
Q: What is the difference between single-stage and dual-stage reeds?
A: The stock reeds in your motorcycle are single-stage reeds. Single-stage implies that they are of a one-piece design. Their ability to function efficiently throughout the powerband is limited due to their inherent design. A thin, flexible reed will perform well at low RPMs, but does not perform well at mid to high RPMs. A thicker, stiffer reed will perform well at high RPMs but not at low to mid RPMs. Therefore, one reed of a given thickness and stiffness is not versatile enough to perform effectively throughout the powerband. The end result being that motorcycle manufacturers end up compromising on a reed of a given thickness and stiffness that will provide adequate response.
In order to overcome these limitations, Boyesen developed and patented the dual-stage reed. The dual-stage design incorporates a highly responsive top reed placed on top of a stiffer, ported reed for superior performance throughout the entire powerband. The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs. The stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs. Dual-stage reeds work in unison to perform efficiently throughout the entire powerband. The difference in stiffness between the top reed and the bottom reed allows the reeds to respond quickly and accurately to changes in engine pressure as you accelerate or back off the throttle. This translates into a dramatic increase in engine efficiency and performance across the entire powerband, from start-up to wide open throttle.
Now...I didn't say AND I'm
not saying that everything you read on the web is correct or makes even a modicum of sense.
Oh...and you can even find pictures of 'em:
A btw...but I've never seen that their dual-stage reeds make much sense. Look how much area difference there is between the two reeds...and the bottom/stiffer one is going to move to any extent?? And if it does, it's going to flow how much more air? Besides, if this dual-stage thing is such the hot ticket, how come their world famous RadValve doesn't have 'em?
Like I said...don't believe everything you read on the web. I'd believe it if I saw some hi-speed photography of them working along with some flow bench readings. Why not put something like THAT in their ads?
Gotta go. I'm ordering my EdenPure fantastic heater. It will heat my whole house AND cut my heating bills in HALF....all on a 15amp house current circuit!! Isn't that amazing!!!
