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Does anybody know how Yamaha's new throttle bodies work?
Posted: Mon Mar 06, 2006 1:53 pm
by Petrovich
Picked up a set for my GS for cheap. All fine, the sensors hook up real nice and easy, BUT there's this whole suction-piston setup thing. There's a little cylinder on top of those throttle bodies, and shields before the throttles (like in carburetors). So far I could not find out how it hinders me, other than the shields being somewhat obstructive (although I think they retract under vacuum). But I just want to make sure that I don't need to make any special accomodations for this throttle body.
It came out of an R6, and I'm going to be using it with 3.0 MSII and an in-tank fuel pump.
Also, the thing has a vacuum line going to the fuel pressure regulator - is this normal?...
Posted: Mon Mar 06, 2006 3:09 pm
by keithmac
Can you post a pic?
Posted: Tue Mar 07, 2006 9:21 pm
by Petrovich
Attached...
Posted: Wed Mar 08, 2006 8:36 am
by nobbi1977
Hi
If this is the same sort of thing as my CBR bodies then the thing on the top is
Idle/warm up and works by bleeding air through bypass holes. if you look at the inlet side of the bodies there should be some small holes the go to the outlet side of the butterfly.
the other things are to keep air flow at maximum velocity, so when you slam the throttle open they open more slowly to keep air speed up. I think they are like the slides on an old CV carb
Posted: Wed Mar 08, 2006 1:10 pm
by Petrovich
Ok, that sounds good... But how do you control the warm-up thingie? It has no cables going to it, just two hoses and that's it.
BTW, there's an idle adjustment screw also,
Posted: Wed Mar 08, 2006 2:08 pm
by evolotion
Petrovich wrote:Ok, that sounds good... But how do you control the warm-up thingie? It has no cables going to it, just two hoses and that's it.
BTW, there's an idle adjustment screw also,
i know nothign about this setup, but i'd hazard a guess engine coolant just goes through the hoses and the valve thing is some kind of thermostat. try hooking it up to the hot tap in your house(if you think itl be alright to put water through it) and see??
Posted: Wed Mar 08, 2006 2:36 pm
by nobbi1977
I think your correct about the coolant controled warmup. i am sure it could be replaced with a stepper motor if you wanted a lower idle, most bikes tend to tick over quite high (1.5-3k) and than drop as they warm up.
Posted: Wed Mar 08, 2006 6:28 pm
by Petrovich
Well, my GS is aircooled
But I'll try the cold/hot water trick, if it works I'll try to run my oil line through that, or something of that sort.
Posted: Thu Mar 09, 2006 12:34 am
by nobbi1977
Yam bits on a Suzuki!!!!!!
I would just rig it up to the choke cable you have now.
Posted: Fri Mar 10, 2006 6:57 am
by nobbi1977
Hi
Was surfing for other bits and thought about this thread.
try
here for R6 shop manuals
They should give you an idea of what links to what