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Discussion Starter · #1 ·
so im trying to decide my next move: full yoshi, or slipon. c-f or not... if i do slip on, do i just add a washer to my shim? if i jet, should i just buy keihin parts individually instead of a kit?

i want a kick ass sound from the exhaust, but i dont want it to be cop-alertingly loud. just had a cop behind me today and pulled over someone right infront of me for a super loud ass exhaust... i dont want that to be me :)

im so torn, i dont know what to do. anyone with a yoshi have advice to if the full is worth it? and jetters, what is your advice for jetting? questions questions questions...
 

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He gummybear check out youtube... do a "week" recent on video post... under "ninja 250" they have a video of three black ninjas showing the sound of the exhaust systems they have. I like the sound from the middle...
 

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Discussion Starter · #3 ·
yea you are right... ive never seen the one in the middle, but it sounds better than the yosh... is racetech euro only? cause i havent seen them anywhere ive looked...
 

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well i dont know yet.. we just bought a new yoshi full for my wifes bike (ebay 580.00 free ship) she got in a fenber bender exhaust was all that was damaged luckily. but were replacing the exhaust with the yoshi full. when i get pics up I'll post, and let ya know what they sound like.
 

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You probably want to keep looking into the sound that best sutes you... I keep reading forums on several riders wanting to make there exhaust quieter... u don't want to make the wrong decision good luck.
 

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Discussion Starter · #7 ·
yea thats true... the yosh comes with an insert to quiet it down... also, i got some news of a new as-yet-unreleased full yoshi system that has carbon fiber endcaps on the stainless full. im trying to find out more info now...
im so all over it if that is the case
 

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Here is the video from youtube if anyone hasn't been able to find it.

http://www.youtube.com/watch?v=4B4r7MqysTE

I have to be honest with you. I used to think that the Yoshi sounded the best, but now I'm kind of wondering. I had a friend listen to all of them and he thought everything but the stock sounded like a lawn mower. I'm quickly coming to the realization that it might be a waist of money to buy a new exhaust for my bike when I'll probably end up selling it off eventually to get a new 600 bike that will already sound better just stock. New exhausts are just so expensive. No matter what you do to your 250 it's still going to sound like a 250. And no I'm not dissing because I love my 250. I'm just calling it like I see it. (or hear it)
 

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Discussion Starter · #9 ·
i hear you... im not trying to make my 250 into a 6 tho... im going to be keeping my 250 for a LONG ass time.i just want to give it some personality. if you are going to keep it, why not make it yours?
 

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I agree completely. If you're going to keep it for a long time you might as well enjoy it the best you can. Plus all the money you'd save in insurance for a smaller bike makes it easier to do more mods. =)
 

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Discussion Starter · #11 ·
haha true :)
and it helps finding a place that is WAAAY cheaper than other stores for exhausts haha

but back on topic :-| (straight face)
whats up with jetting? ive read that it is _not_ reccomended to drill out the fuel/air mixture screw in the carb, contrary to what dynojet sez... does the screw in the carb really need to be adjusted?
 

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gummybear, you definitely want to jet with a full system. You can get away with just shimming with a slip on, but a full system breathes so much better, you'd be silly not to jet, and to do some intake mods, like at the very least, removing the snorkel.

St. Louis huh? You could probably go up two or three jet sizes, depending on the exhaust and intake of your choosing... The air is thick down there.

Read this:
http://www.geocities.com/motorcity/speedway/2476/basics.htm

and check this out (if it doesn't load, go to "carburetor parts" under Fuel and Air:
http://www.bikebandit.com/houseofmotorcycles/kawasaki-motorcycle-ex250j9f-ninja-250r-2009/o/m17969

And once you've done that, hit me (us) up with some questions, and we'll point you in the right direction.

It all really depends on what you want to do. Yosh has a long history of tuning great exhausts for performance, especially for Kawis. Not neccesarily for sound. IMO, Red's $36 muffler has the best, throatiest sound out of all of them....

I will be posting a variant on the $36 muffler, with a back-pressure valve I'm hoping within the next month (sorry it can't be sooner, school, work internship, ya know?!) If you wanna wait.

Some other options to consider:
1.) stock exhaust systems are tuned for ONE thing: Emissions.
2.) The slip on at the back of the exhaust produces 90% sound quality, but only about 10% power.
3.) The exhaust headers/down pipes produce the other part of power, but have little effect on the sound - albeit some...

So, give us a specific desire, and we will try to help. :)
 

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Discussion Starter · #13 ·
wow spooph thats a bitchin site! ive been trying to find an exploded view of a carb like that forever!... all ive found are like chainsaws and such...
those 2 links are fantastic man. this will help tremendously with jetting

so im definitely going to get the exhaust(yosh) and jet kit... just a matter of when now... gotta find time when i can take everything apart, and not fail out of school ;-D
 

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haha, I' with ya gummybear, the whole school thing.

One thing I've learned about wrenching on a bike, is YOU GOTTA HAVE TIME. Like, no joke. It cost me $220 to replace the stock vacuum slides on my carbs because I rushed to get it done... These days when I modify I make sure to have time for at least 3 beers.... Nor am I saying get drunk and wrench, that's just as much bad news. What I am saying is put on some tunes, have a brew near by, take a Saturday, or a at least the ENTIRE afternoon, so you can relax and enjoy yourself. You can check, double check and triple check everything, and do it right the first time. In the end, it will save you time and money. :)

Also, I'm sorry for being unconventional, but what's this "jet kit" everybody keeps talking about.... And how much is it? I'm cheap, and I know that all I need to re-jet is slightly larger jet, and nuttin' else. A new jet at my Kawi dealer is like $3.00, for two, is like $6.00, so if you're paying more, you're wasting your money in my opinion. Can somebody provide me with a linky so I know exactly what all- y'all are talking about.

Thanks and good luck!
 

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Discussion Starter · #15 ·
believe me, i take my time. i will only work on my bike if i know i have the whole day for it :)
and its dynojet 2193... comes with 3 sets of jet needles... a bigger main jet... clips. really nothing and its 70-90 bux. i agree that its alot, but at the same time, a drop in the bucket when you are talking about your exhaust, and the potential damage to your engine/carb if you use janky/broke ass/cheap/wrong parts when you jet. its made for this bike, so..
http://www.2fiddy.com/2008/04/dynojet-kit-2193-for-the-ninja-250r-fn-awesome/
 

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Sweet, that looks awesome, and I don't think you can beat the price in the long run. When you do get the kit, please take a picture of the needles in the kit, compared with the stock needles that come with the bike.

I've got a bit of project with my 250. I'm trying to find the best, easiest way to get about 40hp out of the bike and limiting myself to mostly stock parts. Unfortunately I don't have a lot of money, or more important, the time, so I'm finding myself doing a lot of research so I can make every second count, when I finally get to wrenching, ya know? So please let me know.
 

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Discussion Starter · #18 ·
sure thing! once i hear back from the guy ar motorcycle-superstore ill place my order and let you know what all happens. im planning to photo-document the exhaust/jet install, so there will be pix
 

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Discussion Starter · #20 ·
ok so i did the deed... i ordered a c-f full yoshi and jet kit from motorcycle-superstore. i will post up tons of pics when i get it and install it, as a walkthrough
 
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