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Old November 13th, 2017, 05:54 PM   #1
Dustin5611
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Shorty GP exhaust

Hi I've been riding a ninja 250 for a while and I was a louder sound I want a shorty exhaust but I was wondering do I need to do anything special for it if I get a slip on like rejetting or anything it would really help to know
2012 Ninja 250
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Old November 13th, 2017, 08:25 PM   #2
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Welcome, Dustin!

While you shouldn't have to do anything for a slip on, overall the lil ninja runs a bit lean from the factory. imho... it would benefit you to richen the mix up a little bit (jets/shims), no matter what exhaust you have installed.
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Old November 13th, 2017, 08:29 PM   #3
Dustin5611
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Is there anyway you could give me a hint on how or how much to adjust it?
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Old November 13th, 2017, 08:51 PM   #4
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Is there anyway you could give me a hint on how or how much to adjust it?
I installed a set of Yoshimura mufflers on my 2007 250 Ninja (no baffles). The only jetting change I made was to bump the main jets from 105s to 110s and I'm very happy with my bikes performance. I can hit an indicated 100 M.P.H. in 6th gear with 15/42 sprocket gearing and a stock air filter. I see no need to shim the jet needles.

Bare minimum you'll want to increase your main jet size. The jet needle thing is a matter of taste and personal preference.

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Old November 13th, 2017, 08:59 PM   #5
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Dustin, do a search on this forum for "jetting database". Many members here have posted their bike setup. Perhaps you can find one that is a close match to your setup and elevation to give you a starting point and tweak from there. To answer your question directly, for your shorty slip on, perhaps 2 or 3 shims will be enough. $3, an hour or two of time and few beers to top off a good night in the garage with your bike.
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Old November 14th, 2017, 05:36 AM   #6
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Old November 14th, 2017, 09:26 AM   #7
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Old November 15th, 2017, 03:39 PM   #8
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Old November 15th, 2017, 04:10 PM   #9
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Old November 15th, 2017, 05:22 PM   #10
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Old November 16th, 2017, 05:31 AM   #11
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A suggestion to the OP:

Don't throw away or sell your OEM exhaust. You may ultimately decide to put it back on.

You may find, as many have, that louder is not necessarily better. Louder is just louder.

Overly loud exhausts can be obnoxious, fatiguing and headache-inducing not just for the people you inflict them upon, but for you too. And make no mistake... the 250 can be LOUD.

What matters more IMHO is the character of the sound. When I had a ninjette, it was fitted with an AreaP Quiet Core exhaust (i.e. the long muffler). It sounded FANTASTIC. Louder than stock but in no way rude, and the tone was deep, rich and resonant.

Not trying to talk you out of getting the GP exhaust of your dreams, just giving you a heads-up that it might not be what you hope for.

Re jetting... do a search. There are lots of threads here, including a jetting database.
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Old November 16th, 2017, 09:22 AM   #12
Ram Jet
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Quote:
Originally Posted by adouglas View Post
A suggestion to the OP:

Don't throw away or sell your OEM exhaust. You may ultimately decide to put it back on.

You may find, as many have, that louder is not necessarily better. Louder is just louder.

Overly loud exhausts can be obnoxious, fatiguing and headache-inducing not just for the people you inflict them upon, but for you too. And make no mistake... the 250 can be LOUD.

What matters more IMHO is the character of the sound. When I had a ninjette, it was fitted with an AreaP Quiet Core exhaust (i.e. the long muffler). It sounded FANTASTIC. Louder than stock but in no way rude, and the tone was deep, rich and resonant.

Not trying to talk you out of getting the GP exhaust of your dreams, just giving you a heads-up that it might not be what you hope for.

Re jetting... do a search. There are lots of threads here, including a jetting database.
I agree with you. I bought my Ninja this past March and cleaned-up the stock pipes. Evapo-Rust and Mothers Car wax - they look darn good. Then I saw some Yoshimuras on sale. Pricey but I bought them because they are all stainless. I'm keeping my stock pipes but I love the Yoshimuras deep 500 like sound. A-little louder but not obnoxious.

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Old November 16th, 2017, 10:05 AM   #13
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When I ride my Guzzi 1000 with stock exhaust, I get enough deep sound, and a ride on the nice and very quiet 250 is refreshing. If I ever need to change the mufflers on the Guzzi, I'm going to try for something quieter. I don't find noise to be a positive thing on multi-hundred mile rides.
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Old November 16th, 2017, 12:24 PM   #14
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I have a delkevic shorty exhaust I'd sell to you for 25 bucks + shipping.

It's pretty loud. Annoyingly loud.
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Old Yesterday, 07:34 AM   #15
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Well we see none of these folks learned that loud pipes save lives #fakenews
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