EXUP Worldwide

hey Guys is it adviseable to fit a straight thru system , and remove the whole box , or not?<br><br><br>what diffrence would it make? <p></p><i></i>

It will cause a lot driveability problems stevo, get another FZR you don't care about. <br> Buy cheap aftermarket exhaust systems. Buy as many as you can afford. <br> Fit them each one at a time. Try them all with different carb set-ups.<br> If you find a set up you like, buy duplicate quality parts, and fit those to the bike you plan to keep.<br> <br> Axing your exup will earn you the ire of PSB Matt, and Chuck D, but also the un-dying admiration of all the aftermarket tuner parts suppliers. You will need a lot of them.<br> My '92 RU FZR 1000 has a full system, The intake and exhaust systems no longer resemble a stock set-up much at all. <br> My garage is also full of expensive parts that didn't work on the bike, and are now useless to me, except maybe as conversation pieces under a glass coffee table. <!--EZCODE EMOTICON START :o --><img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"><!--EZCODE EMOTICON END--> <br> I am still working on making the bike run like I think it should.<br> For me that is part of the fun. If it works out fine, but I doubt there are many here who would want to follow my example - cost wise, and driveability-wise it just isn't worth it.<br> I still have my EXUP servo. I know where it is in that pile of parts. <br> I suspect it will one day find its way back onto the bike. <p><!--EZCODE FONT START--><span style="color:red;font-family:verdana;font-size:x-small;"> cvhjkthis</span><!--EZCODE FONT END--></p><i>Edited by: <A HREF=http://p072.ezboard.com/bexupbrotherhoo ... upElvis</A> at: 3/15/05 1:06 pm<br></i>

aaah , so thats a no go then :P <p></p><i></i>

I think the point Elvis is trying to make is that it isn't advisable. Do-able, yes, Advisable, no. <p><!--EZCODE IMAGE START--><img src="http://img.photobucket.com/albums/v209/ ... <!--EZCODE IMAGE END--><br><!--EZCODE ITALIC START--><em><!--EZCODE FONT START--><span style="color:red;font-family:times new roman;font-size:small;">There are some who call me........Tim?</span><!--EZCODE FONT END--><br><!--EZCODE FONT START--><span style="color:white;font-family:times new roman;font-size:small;">Director of Entertainment <!--EZCODE LINK START--><a href="http://eddieandthecruisersmc.com" target="top">Eddie & the Cruisers</a><!--EZCODE LINK END--></span><!--EZCODE FONT END--> <br><!--EZCODE FONT START--><span style="color:blue;font-family:times new roman;font-size:small;">1994 FZR 1000</span><!--EZCODE FONT END--></em><!--EZCODE ITALIC END--></p><i></i>

Wooooooooooooooorrrrrrrrrrrrd up dadio. <p><!--EZCODE FONT START--><span style="color:red;font-family:verdana;font-size:x-small;"> cvhjkthis</span><!--EZCODE FONT END--></p><i></i>

Mine seems to work fine without it? Go figure. <p></p><i></i>

My bike did not have the exup in place when I got it. I live at 8000 feet elevation and think it would make it run a lot better at low RPM if I had it. Low end torque is nice. I had to play around a lot to get it to run right. The fix turned out to be replacing the emulsion tubes in the carbs. All this said I think the gains are small for a lot of hassle. <p></p><i></i>

I am not in favor of removing the exhaust gate valve on a streetbike.<br><br>Matt at PSB <p></p><i></i>

My FZR has the exup removed. If you plan to make a large amount of engine mod then taking it off is good. Otherwise leave it on. <p></p><i></i>

stevo you need to sit down...grab a beer...get a comfy chair...and read every post in TECH, 89-95, and YZF750.<br><br>You'll find every question has been asked at least once in the last 5 years.<br><br>When your done reading, you'll perhaps be answering our questions.<br><br><!--EZCODE EMOTICON START :smokin --><img src=http://www.ezboard.com/images/emoticons/smokin.gif ALT=":smokin"><!--EZCODE EMOTICON END--> <br><br><br>But I still love this question! I have no exup on the 1040 bike. I think it's the meanest bike around.<br><br>John's Definition of <!--EZCODE FONT START--><span style="color:red;">MEAN</span><!--EZCODE FONT END-->:<br><br>Ellusive flat spot around 3k. Need to shift around. If not the bike will try and throw you like a bucking bull. Handlebars will sway, occasional fire ball out the can, followed by that guarunteed explosion that causes most elderly pace makers to skip. You can't beat the sound of the exhaust with a baffle-less can. It does no doubt give better top end. I did higher MPH on that bike over my other two bikes. Thats with the tranny skipping.<br><br>If thats not mean I don't know what is. But I would like to rebuild the motor now. <p><!--EZCODE ITALIC START--><em><!--EZCODE FONT START--><span style="color:steelblue;font-family:times new roman;font-size:medium;">-John</span><!--EZCODE FONT END--><br><!--EZCODE FONT START--><span style="color:blue;font-family:times new roman;font-size:small;"> <!--EZCODE LINK START--><a href="http://img.photobucket.com/albums/v206/ ... cement.jpg" target="top">1995 FZR1000</a><!--EZCODE LINK END--></span><!--EZCODE FONT END--> <br><!--EZCODE FONT START--><span style="color:blue;font-family:times new roman;font-size:small;"> <!--EZCODE LINK START--><a href="http://img.photobucket.com/albums/v206/ ... 00x600.jpg" target="top">1990 FZR1000</a><!--EZCODE LINK END--></span><!--EZCODE FONT END--> <br><!--EZCODE FONT START--><span style="color:blue;font-family:times new roman;font-size:small;"> <!--EZCODE LINK START--><a href="http://img.photobucket.com/albums/v206/ ... resize.jpg" target="top">1990 FZR1040</a><!--EZCODE LINK END--></span><!--EZCODE FONT END--></em><!--EZCODE ITALIC END--></p><i>Edited by: <A HREF=http://p072.ezboard.com/bexupbrotherhoo ... >jjs777</A>  <IMG HEIGHT=10 WIDTH=10 SRC="http://home.comcast.net/~john.stempien/ ... larger.gif" BORDER=0> at: 3/19/05 2:35 am<br></i>

Hello Stevo<br><br>Removing the EXUP is not difficult at all, you will have to leave the servo on, and fabricate some sort of stainless blanking plate to cover up the EXUP housing. I put in a few minor alterations in the carb, and it all works fine.<br><br>Regards - Lemmy<br> <p></p><i></i>

What kind of carb mods are we looking at? Mine seems to run pretty good as it is..... Maybe a little rich? <p></p><i></i>

if yuo remove the exup valve it will run lean in that rpm range due to upsetting the resonance of the pipe in that RPM range (think overlap of the cams) so you are really upsetting the cyl filling and blowing fuel air out the exh valve, but that rpm range is usually in the needle taper and you would have to alter that to get the fueling correct for that rpm range. It's a lot more difficult to do that it is to talk about it<br>Jim<!--EZCODE EMOTICON START :cheers --><img src=http://img.photobucket.com/albums/v209/ ... Cheers.gif ALT=":cheers"><!--EZCODE EMOTICON END--> <p></p><i></i>

BIG Comfy chair, over 100 Posts.<br><br>Chuck D. <p></p><i></i>

<!--EZCODE QUOTE START--><blockquote><strong><em>Quote:</em></strong><hr>BIG Comfy chair, over 100 Posts.<hr></blockquote><!--EZCODE QUOTE END--><br><br><br>And a couple logs for the fire....<br><br>Snow comming down outside.<br><br>Dog laying at your feet...<br><br>Glass of Brandy at hand...<br><br>relax, You're going to be here awhile!<br><br>Snerk!<br><br>Jim<!--EZCODE EMOTICON START :cheers --><img src=http://img.photobucket.com/albums/v209/ ... Cheers.gif ALT=":cheers"><!--EZCODE EMOTICON END--> <p></p><i></i>

<!--EZCODE LINK START--><a href="http://preloved-motorcycles.com/books/p ... >Sportbike Performance Handbook</a><!--EZCODE LINK END--><br> I found a lot of very useful information in this book. <br> The eye-opening part about it for me was that I read it after I had taken my EXUP valve off, and had started to attempt tuning around the flat spots/ run rich problems etc. that a FZR sans-EXUP valve will normally have.<br> < I ended up with a messed up bike, and then.........><br> Kevin Cameron explained in the text what I had done (jetted richer on low speed), why I had done it (flat spots in rev-range), and the futility of trying to make it work the way I was going about it, (I had less power, and was running very rich).<br> After lighting into the job, and first making mistakes, It was like having a bright light turned on suddenly in very dark room.<br> By the book. Read it. (Well at least those of us asking the no-EXUP question)<br>If - after that - the magic combination suddenly turns up, I would certainly like to hear it. <!--EZCODE EMOTICON START ;) --><img src=http://www.ezboard.com/images/emoticons/wink.gif ALT=";)"><!--EZCODE EMOTICON END--> <p><!--EZCODE FONT START--><span style="color:red;font-family:verdana;font-size:x-small;"> cvhjkthis</span><!--EZCODE FONT END--></p><i>Edited by: <A HREF=http://p072.ezboard.com/bexupbrotherhoo ... upElvis</A> at: 4/6/05 1:55 pm<br></i>

Hello - I put in K&N needles since the stock does have a hole somewhere between 7k-8.5k, main jet are changed up to #130 on all cylinders, idle screw is out 2 turns, and the float height is lowered just a bit. The exact height is to be confirmed next time I am doing anything down there. With regards to the idle screw, changing the idle jet from #45 to #50, makes it possible to turn in the screw about one full turn. I believe that it improves the fine tuning in that area.<br><br>Regards - Lemmy<br><br><br> <p></p><i></i>