Evening folks.
I received a set of Yamaha FZ6 Fazer throttle bodies through the post yesterday (cheers Zilspeed) and I am a bit confused about all the pipes and
"stuff" that is attached to them. The injectors, fuel rail, fuel rail damper, and mechanical stuff, I am fine with, but there are a number
of pipes that I don't really know what they are doing. There are three little openings connected to pipes in total.
Most of them connect to each throttle body seperately, and they all go through to openings on the "inside". All of them are after the
throttle butterfly.
One hole is connected together with T junctions (4 into 1) that is then fed into a sensor of some sort. I am assuming this is the vacuum sensor.
One hole from each body, is connected to a hose, that is simply plugged with a moulded plastic plug. It is not connected to anywhere else.
The final hole is slightly bigger, and is connected to a housing of some sort that has four adjusting screws on it, one main adjusting screw, and a
housing that has two more hoses coming off it (that aren't connected to anything that I have). I have no idea what this, but it could be some
kind of EGR valve perhaps?
I don't suppose anyone here is familiar with these bodies, and can offer a bit of advice? I'll try and post some pictures tomorrow if it
helps.
Cheers
Andy
That sounds like the same as the 2002 R1 setup as well. There are service manuals available on the web, but from what I remember they go the the
airbox on the original R1 setup, possibly to have some Ram air effect i'm not sure?.
Ours work Ok without them on a Pinto engine running a Megasqirt.. and the Vaccume to the MAP sencor is rubbish using the original takeoffs as well.
Hi folks,
Right, I have been digesting the information available in the service manual for the FZ6 bike, and I think I have it sorted.
The connection that goes to a sensor, are the vacuum sensor (manifold air pressure) connection. I presume they are connected together so that the
sensor "sees" the average reading across all four cylinders.
The connections that are individual to each throttle body, and are just blanked off, appear to be used when balancing (syncronising?) the throttle
bodies.
The connection that goes to the control box of some sort, appear to be called the "plunger control unit". This has a connection to each of
the throttle bodies, two connections to the plenum chamber (downstream of the airfilter) and the other two connections are plumbed into the coolant
circuit. I can only assume that this controls the idle speed of the engine, by bleeding a bit of air past the throttle butterfly when shut. The
amount of air let through is apprently regulated by a few screws, and also by the coolant temperature.
Does this sound about right?
Cheers
Andy
They sound exactly like the R1 Tb's and even all the other gubbins.
I'm not sure what the "plunger control unit" is i'm not sure we've got 1 of those.
I suspect by where it connects to the air box it either helps or slows the movement of the throttle slides (the plastic slides that lift up out of the
way as air is pulled through them) I presume there to keep a constant velocity of air through the TB for smoother responces.
But the idle speed controler you mention is exactly what it is, it allows air to bypass the throttle butterfly and allow the engine to idle faster
till warm, becareful with this as they are only very small pipes and they block up quite easily with any bits or dirt or rust from the engine block.
quote:
Originally posted by bigandy
Hi folks,
Right, I have been digesting the information available in the service manual for the FZ6 bike, and I think I have it sorted.
The connection that goes to a sensor, are the vacuum sensor (manifold air pressure) connection. I presume they are connected together so that the sensor "sees" the average reading across all four cylinders.
The connections that are individual to each throttle body, and are just blanked off, appear to be used when balancing (syncronising?) the throttle bodies.
The connection that goes to the control box of some sort, appear to be called the "plunger control unit". This has a connection to each of the throttle bodies, two connections to the plenum chamber (downstream of the airfilter) and the other two connections are plumbed into the coolant circuit. I can only assume that this controls the idle speed of the engine, by bleeding a bit of air past the throttle butterfly when shut. The amount of air let through is apprently regulated by a few screws, and also by the coolant temperature.
Does this sound about right?
Cheers
Andy