EXUP Servo Help

Hi,

I'm trying to make sense of this text but I'm completely lost.

All you have to do is remove the servo box under the seat and take the gearbox apart. remove all the gears and then the backing plate. This will reveal the motor and postion sensor. All you have to do now is clip the wires off the connector for the motor (red and black wires). the postion sensor is the only thing you have to have to run the bike. The postion of the sensor is critical though. Make sure the flat faces the wires or else you will throw a code. To keep it in that postion I drilled a hole perpendicular to the shaft and put a cotter pin in to hold in place

I want to remove the exup servo from the bike (FZ1S 2006) as I don't need it with the new end can and also to make some space for other goodies.

Can anyone explain it to me a bit more?

Thanks

anyone? please!!

Looks like the thing you want to get at is hidden within the depths of the engine, hence to remove it requires the bike being taken apart. Sounds like a messy job; isnt there a way to just deactivate it electronically?

Matt

Er your going to have a problem if you unplug the exup motor as it will tell the engine management system there is a fault! even on the older shape fazer the one ive got,if there is a problem with the exup valve it causes a fault to be registered i/e the rev counter jumps to 3000rpm stays there and then goes back. I personaly would leave it well alone unless you have changed the whole system for a straight through race jobby that tend not to have a provison or or a need for an exup valve because race bikes speed all there time up around the top of the rev range. You will find general road drivability will be effected if you remove it, and lets face it how often do you realy get to open a fazer 1000 up

you can deactivate it but you will also need to remove the actual exup flap in the exhaust collector box which is going to be a pain, like i say as far as removing it its going to cause you engine management probs.

The EXUP valve is designed to give the bike some low down power.

An exhaust works by pressure waves bouncing down from the end back to the exhaust port, then bouncing back to suck the next lot of burnt gases from the combustion chamber. As the pressure waves move at a fixed speed, yet the time they have to bounce back varies with revs, this effect only works over a certain rev range. At half the revs they work best at they have the opposite effect, raming the burnt exhaust gases back into the combustion chamber and screwing up mid range power.

The EXUP valve is there to disrupt the pressure waves at low revs.

No amount of fiddling with the mixture / timing will get rid of the effects of dumping the EXUP valve.

The small gain from the pipe might well make a skilled rider on track a touch faster than the stock exhaust with the EXUP valve, but for 99% of us the lack of low down power and likely gaping hole in the mid range will make us slower and the bike less pleasant to ride.

Says it all realy leave well alone

Cheers Mark

The reason why I want it off is because when you put a slip on exhaust the EXUP valve doesn't need to operate. So included in the fitting instructions of many manufacturers it says disconnect the cables from the valve on the exhaust.

That is an easy job to do - so no problems there.

The EXUP servo motor is therefore not being used with any slipon exhaust. Removing it as you say will cause an error 17 code to appear on the clocks. There are 2 ways of cheating the ECU to think there is a servo motor in place and the above is one of them.

The 2nd is a plug that goes on it but that whole site is in german and I haven't got a clue what it says :S hence why I went for the english version

http://www.fazerforum.net/viewtopic....7026&start=225

or even more info

http://www.fazerforum.net/viewtopic....ht=exup&t=7026

[yorkie_chris]

Originally Posted by 600+

The reason why I want it off is because when you put a slip on exhaust the EXUP valve doesn't need to operate.

Why not?

IMO the reduced backpressure with a slipon can on where the engine needs some backpressure, due to the cam profiles i.e in the mids will be even more pronounced with a can on it.

Leave it alone.

What he means is that on the 2006-2008 Yamaha FZ-1, the EXUP valve is actually contained within the muffler, not the part of the exhaust pipe under the engine.
So, removing the stock muffler and fitting a slip-on automatically rids the bike of the EXUP valve.
This is also the case with 2006-2007 (and probably 200) YZF-R6 models.
*Grrr! Damn smiley!*

(As a side note, most people I know or have posted their thoughts on message boards dedicated to the FZ-1 say the EXUP used on today's FZ-1 is more about reducing exhaust emmisions (noise, probably) at key points of RPM/load/throttle position, the reasons being where the EXUP valve is positioned in the exhaust system, the size of the valve, and when it moves in relation to the operating conditions of the engine.
That is: This EXUP valve doesn't move according to the same parameters that the older versions did (like on the 2001-2005 FZ-1 models).
The older EXUP valve moved in accordance to engine RPM and was aimed at improving low end performance, where this new one moves in accordance to cutting noise when it most needs to be cut.
This is the main reason everyone thinks you can get rid of it without any kind of performance loss.)

The part 600+ posted about some manner of modification relating to EXUP disabling sounds like somebody going into the EXUP servo motor, taking it apart, and snipping key electrical wires that will render the EXUP servo motor unable to turn the EXUP valve but yet not throw a fault code on the instrumentation.
This kinda' sounds like somebody wants to keep the stock muffler and EXUP on their current model FZ-1, but disable the servo motor from being able to close the valve, leaving it open all the time.
If I were to install a slip-on onto one of these bikes, I'd either just disconnect the EXUP cables and simply allow the EXUP servo to stay there or buy one of the available EXUP servo eliminators that plugs into the bike's wiring, fooling the bike into thinking it's still there.

Im with you now i havent seen where the valve is on the new ones its in the slipon link pipe isnt it! not done one of these yet, as you say there are ways around fooling the ecu into thinking it is still connected but just be carefull that you dont damage anything so it can be returned to stock if you need to sell it, also if your bikes still under warranty this obviously would effect it.