EXUP valve removal

[Dr freedom]

Ive been doing some reading re Yamaha's EXUP valve.
It is a device, or a valve if you will, that they put in the rear mid section of the exhaust piping to provide back pressure.
It is controlled by cables connected to an actuator, that in turn receives its signal from the CDi unit.
It is almost closed at low speeds in order to provide more back pressure to the system, as imo, it appears Yamaha's exhaust valves must be open a lot if this is required.

Once you change the exhaust can from stock to say, a Yoshi, the mid section which contains the control valve is goone.
I also understand that you must leave the actuator unit plugged in to the CDi, in order for the system to still function electronicly properly & can get rid of the cabling.

Now, I dont have any issue with this as I will be getting a reflash & tune done, although how many of you Yamaha folks out there have done it & are better off & how many of you did it & were worse off?

[jasonbw]

Ooops... I thought the 5 valves actually were in the head, I know theres an exhaust valve, but still thought the 5th valve was a head one :) damn... ok, I'll bow out now cause this is outta my league.

I can though point you to www.r1-forum.com and if you havent been there already it'll no doubt give you a lot of info on it... I havent looked into it as my 98 R1 has been dyno'd already and I'm not wanting to upset that nice graph by changing anything.

[Pokey]

EXUP is an exhaust valve, although the 04-06 R1 had 5 valves in the head, the 07 went back to 4
My 2000 model R1 has a full system with the servo motor still floating about
Dunno how it changes the bike cause mine was already done, but its spose to help the bottom end but restricts the top end a little

[jasonbw]

ok, so if theres 5 valves in the cylinder head then they all had them.. i.e. even your 2000 model... 07 was the first year without then right? Thats what the FZR1000 was based on.. maybe I'm not going crazy.

[Pokey]

Only one way to find out, most of the bikes in pieces anyway :p

[Pokey]

Just looked through the workshop manual and it looks like the 98 -2001 had 5 valves as well, never knew that

[jasonbw]

Only one way to find out, most of the bikes in pieces anyway :p

OMG, yipe :) I know my mechanical limits.. and head work is FAR beyond me :)

[Pokey]

I max out at flushing the radiator, and that still takes ages and is very messy :)

[jasonbw]

To be honest there is a trick with flushing the radiator on the early R1's.. you know theres two drain points.. you really only need to use the one that easier to get to.. behind the headers.. I'll try to get a photo of it.. once you get the right bolt to remove then its quite easy.

[Pokey]

I found that the second time i did it and i pull the pipe of the side as well, gets more out of th radiator

How much better did your R1 run after the dyno tune?
Been thinking about getting mine done
And whats a rough price

[jasonbw]

I can't tell you, it was bought by me after Mono has done all the hard work... well.. Mono paid his hard earned for Steve at Maxpower in Wollongong to do the hard work (Steve is a perfectionist - just what you want with a tuner!). Heres the dyno chart for ref, see how smooth it is :) Its a far stronger motor than my current model CBR1000RR (stock).
http://members.iinet.net.au/~jasonbw/photos/bikes/My_1998_R1/r1_dyno.jpg

P.s. Sorry Dr about the thread jack, I've continued since I figure you wouldnt mind this info?!?

[Pokey]

That torque curve is awesome
Is that with the standard pipe or has the exup valve been removed?
See back on topic :)

[jasonbw]

Aftermarket pipe but from what I can tell the exup remains!!! What do I need to look for to see if its been gutted? The leads are there, as expected.

[Pokey]

Heres a picture from the workshop manual
The servo sits up under the left side of the fuel tank then the valve looks like its where the pipes go 4-1:ayyy:

[Dr freedom]

Jas, no probs mate .. highjack away .. I get lots from everything I read.

Thats a nice chart you have. Smoothing number reads as standard as well .. so its a half decent chart. Might have to give Maxpower a call.. /rubs chin

I havnt found an aftermarket system as yet that allows for the exup to remain in place within the piping.. however I am taking your comment re "the exup remains in place" as the actuator/servo motor is still plugged in .. rightly so, it needs to be so you dont get it throwing fault codes.

If you want to tell if its in, from the back of your end pipe, look at the mid section, if its still in it will look like this.
(open this PDF instruction manual from Yoshimura, it explains how what why & where it is)
http://www.yoshimura-rd.com/images/product/pdf/1321272.pdf

Edit: just seen your pic pokey .. seems the R1 has the valve smack right up front in the extractors. Mine is located just before the end pipe.

I'll be leaving the servo plugged in & pissing the cabling off.

[jasonbw]

Thanks guys, will do.

[RIPPERTON]

Is this a roady ?
if so dont remove the EXUP
it will destroy the bottom end and wont be as ridable in traffic anymore.
You can disconect the servo but you will get a fault code on the tacho.
I tried making an override circuit but coudlt get some up/down clock chips from Zycor. they would only sell me 80 of them. Theres a guy who devised a circuit board that tells the ECU that the servo is still there and wont give fault codes. Weight saving is all but if your making a track bike or race bike you go for every gram.

[Dr freedom]

Is this a roady ?
if so dont remove the EXUP
it will destroy the bottom end and wont be as ridable in traffic anymore.
You can disconect the servo but you will get a fault code on the tacho.
I tried making an override circuit but coudlt get some up/down clock chips from Zycor. they would only sell me 80 of them. Theres a guy who devised a circuit board that tells the ECU that the servo is still there and wont give fault codes. Weight saving is all but if your making a track bike or race bike you go for every gram.
nah, not tracking it.
I wont be disconnecting it, just removing the cables.

When you say it wont be ridable in traffic, how bad could it be?
Im going to get it remapped & tuned .. that should give it back what it loses when the valve is removed right?

[RIPPERTON]

nah, not tracking it.
I wont be disconnecting it, just removing the cables.

When you say it wont be ridable in traffic, how bad could it be?
Im going to get it remapped & tuned .. that should give it back what it loses when the valve is removed right?

Bad enough to annoy you. R1's are great fun in traffic even at low speed light burnin and dog fighting with cagers and such. If you like that aspect of the R1, dont remove the EXUP

[Dr freedom]

Just did some more homework .. its effects generation 1 more than gen 2 motors.
This was the response I received

"As for low end torque, the EXUP on the gen 2 does not have any appreciable affect on low end torque"

I didnt buy an R1, I bought an FZ1
However I will ride it around with both pipes & see how it goes.
I found a really big FZ1 forum .. seems a PC3 + dyno tune, gutting the cat & modding the airbox is the go.
I wont however this time be doing cranks cams pistons etc etc ..