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Discussion Starter · #1 ·
Hey all, I am really nervous about jetting my bike as I am a total newbie and the dealer refuses to do this mod ( says it voids warranty ). I bought a yoshimura carbon fiber exhaust (slip on) and they recommend a rejet on their site. My question is what will happen if I dont do this rejet. Will it hurt my 2009 ninja??
I know most of you do this rejet or "shim the needles" and say its a must but I'd rather not do it unless absolutely needed. Please any advice. Its a brand new bike and I dont want to take it apart and fool with it, I just want this cool exhast on it...lol. Thanks in advance.
Also this is the kit recommened any further comments appreciated... http://www.dynojet.com/jetkits/motorcycle/kawasaki.aspx
 

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Post pics of the bike.. Or video if u have any. Now about jetting.. Wow I was not aware of warranty been void ... u probably want to really check on that. As to jetting. Everyone here says that if u don't do it the bike runs lean. There is several post about it. And how it gains power by doing so. Even if u don't change the exhaust... red posted on how to rejet ur bike. U probably want to check that out. Good luck.
 

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Discussion Starter · #4 ·
Thanks guys for the reply, but Im still confused about any damage occuring. If I dont rejet or shim and add a new exhaust will I cause damage to the engine by wrong back pressure or some thing like that?? Sorry for being such a newbie but thats what this site is about right?

Yes I will be posting lots of pics and videos in the upcoming months. I want to be a real contributor to this site but I want my bike totally finished before I start.....I intend to have one of the sickest 250's ever seen on this site.....just gonna have to wait!!
 

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Freak, you do run the risk of damage, burning a valve, due to running lean.

Honestly, you'll be much more disappointed with how the bike rides, before the damage starts being done... If you aim at having the sickest bike, you're gonna have to start getting used to playing with the internals of the bike, and the writeups on here are plenty good. Give yourself plenty of time, and take baby steps. When I first started playing with the ninja, it took me 2 hours to take the fairings off... Now it's second nature, and I usually have them off within 15 minutes...

Do yourself a favor, shim the carbs. Once you're ready for the exhaust, look up Gummybear's post on re-jetting the needles - some really good, detailed stuff.

Have confidence in yourself. You can do it, just take your time, have a brew, and don't ever, ever get rushed.
 

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Discussion Starter · #6 ·
Thanks for the info spooph, I will no doubt be getting my hnds dirty at some point. I will have one sick ninja...look wise that is. Performance wise is another story...LOL. Baby steps indeed
 
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