EXUP Removal

[rcp1018]

I've notice a lot of guys are complaining about lack of power and its relational to the EXUP.
My 2013 Apex will not go over 88 - 89 MPH. I checked the EXUP and made a very minor adjustment.
I now have it at the dealership and they can't figure it out and they're waiting for a call back from Yamaha.

So my question is:
Has anyone removed the EXUP from their Apex?
What did you replace it with, if anything.
What improvements did you see in the low, mid and top end.
Any pictures?

Thanks

 

[Ding]

I would be very surprised if the EXUP is causing you all of your trouble, unless it is flat out blocking the exhaust off. Seems like to me you might want to get somebody else to look at your sled. I am skeptical about the technician you are dealing with.

 

[sheetwright]

Did your try this ?

http://www.ty4stroke.com/viewtopic.php?t=127252

I see a whole thread on adjustment related to performance

 

[steiner]

How many miles on the sled? This may have a factor on your top speed and rpm if you are under 1000 miles. Last year during our TY ride a newer Apex was still in the "break in" stages of its life and was getting faster and faster as the miles were counting up.

I don't know what sled you had before but you also have to remember that thie speedo on your 2013 is alot more accurate than the older models like a 2009 or so.

 

[sideshowBob]

IMO:

I would not consider removing the EXUP.
If there are performance issues associated with the EXUP there is obviously something wrong that needs to be corrected.

The post on this thread about adjustment issues was very interesting and may lead to your solution.

JM.02c

 

[snowbeast]

I've notice a lot of guys are complaining about lack of power and its relational to the EXUP.
My 2013 Apex will not go over 88 - 89 MPH. I checked the EXUP and made a very minor adjustment.
I now have it at the dealership and they can't figure it out and they're waiting for a call back from Yamaha.

So my question is:
Has anyone removed the EXUP from their Apex?
What did you replace it with, if anything.
What improvements did you see in the low, mid and top end.
Any pictures?

Thanks

If your apex will only run 88 mph you have some major problems,unless this has always been your max speed and even than you still have something major going on here,what are your full shift rpms where is your belt running in the sheeves,primary will be the easest way to check,as I assume you have marked it and its not cleaning it all out,maybe an ECU problem,a TPS problem,or maybe an esup exhaust problem,but for that speed,you do have a problem,that is not the motor being to tight,all my apex sleds on the very first 100 miles each would all top end in the triple digets.

 

[yooper1]

I feel the EXUP is something that should be adjusted. Last year and the beginning of this year my 2011 Apex XTX would hit over a 100 mph at will. Now I have to hold it as long as possible to hit 95 mph. I have done nothing different and my RPMs used to do 10800, and now it’s only 10400. I’ll pull it apart after the season and see what it’s doing.

 

[Malibu]

My dealer tested my ECU on another Apex fore that reason.He got a new ECU.Sled was not more than 6 months.

 

[cacsrx1]

EXUP for my R1 is hanging in the wall in my garage.......perfect place for it.

 

[snowbeast]

EXUP for my R1 is hanging in the wall in my garage.......perfect place for it.

You care to exsplain why you feel this way,do you now have more top speed,or something.

 

[cacsrx1]

04-08 R1s had a serious mid range dip in the power curve. Aftermarket 4-2-1 header and exup delete would easily gain 15-20 whp at 7000 rpm. To my knowledge there was no aftermarket header that retained the exup. ALL racers got rid of them. Mind you this is for R1's. If your in doubt unhook your EXUP and tie it open and see if you loose a bunch of power..........or if its just a little louder at idle and lowspeed crusing.

 

[sgauthier]

i'm thinking for wide open runs you will not see any difference if you remove or lock it open, but i'm sure you will notice it in the midrange. I believe this was the whole intent behind the valve, for the midrange power where we need it and feel it on the trail. i know there were other factors involved to increase the horsepower but everyone who rides one mentions the instant, right now power that is on tap. the only other stock sled that has come close to this power surge in the midrange is the SRX.

 

[cacsrx1]

i'm thinking for wide open runs you will not see any difference if you remove or lock it open, but i'm sure you will notice it in the midrange. I believe this was the whole intent behind the valve, for the midrange power where we need it and feel it on the trail. i know there were other factors involved to increase the horsepower but everyone who rides one mentions the instant, right now power that is on tap. the only other stock sled that has come close to this power surge in the midrange is the SRX.

Stick a banana in the exhaust of the first gen Apex....wala more midrange...I don't think so. Exup was there to deaden the sound at a predetermined rpm (7k) where the government tested sound, hence the 7k flat spot (bikes). My guess is you would see little difference in midrange with the exup removed and fuel adjusted accordingly, although your sled would be louder at idle/low speed. My guess again is the adjusted cam timing accounts for the better midrange in the gen 2 apex.

 

[sgauthier]

Really the valve is only to lower the noise wow,I guess all of the mags where all wrong and it's just smoke and mirrors. It wouldn't have anything to do with back pressure and scavenging the exhaust at all I guess. If that was the case then why didn't they just change the muffler or like you mention, stick a banana in the tailpipe??? That would have been a lot cheaper. Thanks but I'll keep mine working the way that yamaha intended it to work.

 

[cacsrx1]

Really the valve is only to lower the noise wow,I guess all of the mags where all wrong and it's just smoke and mirrors. It wouldn't have anything to do with back pressure and scavenging the exhaust at all I guess. If that was the case then why didn't they just change the muffler or like you mention, stick a banana in the tailpipe??? That would have been a lot cheaper. Thanks but I'll keep mine working the way that yamaha intended it to work.

Do what you like, I could care less, what I am saying is every private/factory race bike has been removing them for over 15 years. YAMAHA factory sponsored bikes don't run them...........but then again they want the best powerband they can get and don't have to meet the government sound standard.