BMC stock replacemenmt filter... - Kawasaki Ninja 250R Forum
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post #1 of 12 (permalink) Old 11-04-2012, 08:43 PM Thread Starter
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BMC stock replacemenmt filter...

hi folks. i recently bought a 2nd hand 2008 250r from a friend and iam loving it. i wish to put on a stock replacement high flow air filter. ive used k&n on other bikes but have decided to try BMC with this bike.

http://www.bmcairfilters.com/standar...04_d737_5.aspx

my question is, do i need to rejet for this stock replacement filter? because i have decided against rejetting. and how much real world difference will it make?

thanks and cheers.

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post #2 of 12 (permalink) Old 11-04-2012, 10:22 PM
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You do not need to re-jet for a stock replacement

There won''t be a real difference between the brands of a stock replacement filter

However, the differences in performance between an old, dirty filter, and a new, correctly installed filter are huge



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post #3 of 12 (permalink) Old 11-05-2012, 03:39 PM
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Would the same apply to a K&N or other type if aftermarket hi flow air filter?


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post #4 of 12 (permalink) Old 11-05-2012, 05:29 PM
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Most after market filters will flow air better than the stock OEM Filter. These filters are ideal for shimming and re-jetting modifications and may offer small performance gains. Gains of 1-2 hp and better throttle response have been gained from these. However, to get the most benefit, shimming or rejetting is recommended. Take the time to look up "Air Filters available for the 2008 & up Kawasaki Ninja 250R" on the net and check the reviews. Also for the FI Ninjas, read these... "Is another airfilter really better than OEM?" & "For those with FI bikes"
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post #5 of 12 (permalink) Old 11-05-2012, 06:03 PM
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Quote:
Originally Posted by Ricomtzjr View Post
Would the same apply to a K&N or other type if aftermarket hi flow air filter?


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the same would apply

if you're adding pods then yes. The fact that it's a stock replacement says that it functions the same way. Anything's better than the stock brand of course. The difference in air flow will a bit better with a brand new aftermarket filter compared to a brand new OEM filter, but the difference will be very minimal. Hopefully, the aftermarket brand should last longer. It won't make a huge difference, honestly. I've replaced my air filter twice on my '07 and haven't noticed a huge difference between the K&N and UNI stock replacement filters

If you replaced the stock-replacement/OEM filter with pods then the air flow would be much different and you would need to re-jet accordingly



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post #6 of 12 (permalink) Old 11-05-2012, 08:49 PM
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So, theoretically, I should be able to ad a slip-on and a K&N replacement filter and not have to rejet...?


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post #7 of 12 (permalink) Old 11-06-2012, 09:16 AM
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false

a stock replacement air filter does not need a rejet. However, a different exhaust or slip-on will definitely require a reject. The bike is originally jetted only for the stock air filter and stock exhaust(s).

By changing either of those to pods or a slip-on will directly and drastically change the air flow which certainly requires rejetting. Whether you do one or both you will need to rejet



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post #8 of 12 (permalink) Old 11-07-2012, 10:33 AM Thread Starter
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Hi. Thanks for the info. I have purchased the bmc air filter.... stock replacement. Bhp gain is not the most important for me. I did it for the intake roar...

And mine is 2009. Thats fi right? Wasnt rejetting for carbs?

Cheers.

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post #9 of 12 (permalink) Old 11-07-2012, 03:26 PM
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FI wasn't introduced to the 250s until 2013 (ninja 300).


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post #10 of 12 (permalink) Old 11-07-2012, 06:34 PM
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You're in India, so that may be fuel injected. I'm not sure exactly what year Kawi introduced FI into the 250 series in places other than the US, but it may very well be '09



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