Okay
James H wrote on Jan 2
nd, 2018 at 5:35pm:
a secondary butterfly valve that is before the primary throttle body valve. It is there to alter the intake velocity.
James,Okay, makes sense. I think the same thought process in the car world is called an intake runner. The thought in cars is it either lengthens or shortens the intake length, (that is the thought) thus adapting to RPM and such making for more torque in some places, and then less in others making better use @ high RPMs, just depending, above my pay grade.
Again with out looking @ a unit with no problems, we don't really know what a good working one works like, and that part of this system you have captured might be good. That is why over time especially for you in the bike trade need to capture any chance you get from a good working bike in your bay for future REF, as you are a little handicapped as the bike industry IMO does not have people compiling known good wave forms, shoot, my guess is you are one of the very few even using this tool, could be wrong, but doubt it?
As stated maybe somebody else will chime in as bikes an animal all of their own but most of it will transpose from the car world.
StitchB