you should be fine, and no remapping needed. shouldnt need a remap unless you do a full exhaust and air filter is what ive heard. could be wrong though!

i thought about doing the muffler mod myself, but ended up ordering a Yoshimura RS-5 slip-on for mine. the modded muffler definitely sounds nicer than stock though, and is a good alternative to an aftermarket slip-on.

 

Consider the time, money and energy Kawasaki spends on the development of the exhaust system on your bike. All the years, all the data and testing they must do. I'm sure you could fill may books with all the information.

Anything you do to the exhaust system will have some effect depending on what you have done. It's there for a reason, and a good one at that. Years ago you could mess with exhaust and carbs. but now, not as much.

Why would you mess with the butterfly valve???????

 

From what I understand, the only function the valve has is to choke off the exhaust at high rpm (12-14k) and also choking hp. I put a jumper in the ecu harness that tells the valve to stay open so now all the cables are good for is collecting debri. As far as Kawasaki, clearly they know their s#!t. But they designed the 08 exhaust to meet the strickest California noise and emissions standards. I simply didn't think it was absolutely necesary for the bike to be that choked-up. I live in Buffalo and they can't hear my bike in Cali. I simply removed the the last baffle to give the exhaust more of a straight shot out because the bike seemed like it ran a little hot. My only concern is if the computer reads and calculates back-pressure when making fuel delivery decisions and if the small changes I made will effect anything or cause problems down the road.

 

My bike runs at about 210/212 degrees once it's heated up and drops to about 180/190 when the fan kicks in. What does your bike run on average? And what did you do with the cables for the exhaust valve after you installed the slip-on? Thanks for the reply ( I'm new to this whole motorcycle thing and I think I may be infected)

 

Ah the joys of modern engines. I wish every vehicle sold came with a technical manual complete with schematics and engineering notes.

So about the butterfly valve, are you sure it closes at high rpms, not low ones? It sounds similar to TVIS on my Celica, where it closes off half the intake ports below 2k rpm or so for extra torque (no clue how effective this is, but that's the idea behind it). That's intake tho, not exahaust, maybe it's different.

 

My bike runs at about 210/212 degrees once it's heated up and drops to about 180/190 when the fan kicks in. What does your bike run on average? And what did you do with the cables for the exhaust valve after you installed the slip-on? Thanks for the reply ( I'm new to this whole motorcycle thing and I think I may be infected)

My 2004 Ninja ZX-6R runs about the same temps, Fan kicks in around 210. When I am cruising on 70º day temps prob 150-180ºF.

 

I cant remember for sure but Im almost positive the valve is to help govern fumes at lower rpms. The higher the revs usually the cleaner more thorough the fuel is burning so I think you may have it backwards. Only problem I could see is what you mentioned already, back pressure. Usually thats a large part of why an exhaust is there or at least what the stock map/ecu is set for. Not to say its gonna cause any major damage to your bike, which i dont honestly think it will, but its not the best thing for it.

 

This is the article I got the info from about the ZX-6R exhaust. But I didn't think the valve did anything at low revs. I'll look into it. Thanks for the response. http://www.motorcycle.com/shoot-out...-supersport-shootout-cbr600rr-vs-daytona-675-vs-zx6r-vs-r6-vs-gsxr600-82371.htm

 

Consider the time, money and energy Kawasaki spends on the development of the exhaust system on your bike. All the years, all the data and testing they must do. I'm sure you could fill may books with all the information.

Anything you do to the exhaust system will have some effect depending on what you have done. It's there for a reason, and a good one at that. Years ago you could mess with exhaust and carbs. but now, not as much.

Why would you mess with the butterfly valve???????

I'm a little confused here, why is it okay to install a slip-on which I hear shaves weight, lets your exhaust flow easier, is louder an eliminates the factory "exhaust control valve", but when I said I took a can opener to the back of my muffler to help it breathe and wired the ecu so the valve would stay always open, everyone cringed????????

 

Good question, inquiring minds wana know

 

Most people new to the sport and the complexities of modern bikes, typically do not presume to understand how the modern advancements with regard to exhaust systems effects the rest of the engine dynamics.

You can slip on all the end cans you want, the gains in HP within a useable RPM range are almost 0%. That bike was made to perform well all over the planet and with relibility to boot.

My cringing is a direct result of knowing better, and you being new to the sport and all. BTW, check that manual that came with the bike as it will have the spec. printed for average temps.

 

After reading that article, it sounds like the vavle is just for emissions. Do the mod they described about and leave that sucker disabled >

 

BTW, enjoy that almost 10hp gain at 14,000rpm.
Not that you'll be doing much riding up in that range but enjoy, non the less.

If you want more power, buy the 10.

 

Hope I didn't come off as snotty, I have that desease that doesn't let me leave anything alone even if there is absolutely nothing wrong with it. And every once in a while something good comes out of it. I am new to the bike world but I'm not "new" or a stranger to a shop full of tools. The "mods" I did were done in a way that I could easily put everything back if someone were to give me a detailed, mechanical explanation as to why it was bad for the bike. It simply seemed that Kawi's design was geared more toward keeping the bike silent and fume free than HP. Being new to bikes, I do appreciate any input wether it implies that I'm a genius or a complete idiot. When it's all said and done, hopefully I'll end up with something in the middle. In the mean time, I do not "presume to understand how the modern advancements with regard to exhaust systems effects the rest of the engine dynamics." Hence the reason I started this thread. I cleary wasn't 100% sure what effects the seemingly small exhaust changes I made would have on the rest of the engine dynamics. I'm sure that owning a machine like this requires much more than my basic mechanical inclination. And I'm sure I will learn as I go. My goal is to make the bike 110% but it could just as easily end up in 110 pieces. I was hoping that if I want to do something to the bike and post a question, someone knowledgable and experienced would respond and explain WHY I should or shouldn't. And down the road when a newbie posts a question about lopping his/her muffler off, I'll be able to relay what I've learned about the subject instead of simply telling them they should leave it alone because he/she shouldn't pressume to understand modern exhaust systems. I'm here to learn and and if at all possible, contribute anything I can. All that being said, I'd like to get back to the nuts and bolts and riding my new bike.

 

I was "just saying" is all.
Enjoy the bike and your rides.

You just seemed to jump into this mod to me but not to worry that bike willstill rip all day long with or without the changes you made.
Hope I didn't offend in any way as I'm here for my passion as are you I'm sure.

 

I was "just saying" is all.
Enjoy the bike and your rides.
You just seemed to jump into this mod to me but not to worry that bike willstill rip all day long with or without the changes you made.
Hope I didn't offend in any way as I'm here for my passion as are you I'm sure.

Amen! I've been waiting 15 yrs. to get a bike and now that I have one I feel exactly like I did when I was 7 and got my 1st BMX. I'm reasonably certain that Kawi knows at least a little bit more than me about designing and building a sport bike and I swore that if and when I got one, I wouldn't paint anything, cut anything off, bolt anything on,etc.,etc. and 2 months later I did it all.( This is where everyone chimes in and tells me that everyone does it and I don't have some type of disorder). BTW, how different is your bike from mine? My buddy rides an '80 LTD 1000 and my neighbor has an '85 GPZ 500. Neither of which seem half as excited about working on or riding their bike as I do and I don't get it. Is it as complicated as my bike? Because they are just as happy throwing a tarp over it and not riding if it isn't running good.

 

everyone is different man...some mod everything on their bike, some dont mod at all! its personal preference really. some people want a personalized bike, some are fine with plain jane stock off the showroom floor!

i never understood until i got my current car and started tinkering. changed a few things here (painted the dash and shifter trim), new radio and speakers, shift knob. then came the exhaust, intake, new clutch, header, suspension. i got mod fever! i didnt think i would do anything to my bike but...so far i have the jumper mod and i eliminated the rear fender. now im getting the Yoshi slip on and im thinking about relocating the plate and rear lights too! and of course frame sliders...maybe a tinted windscreen as well.

it just doesnt end!