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Hi guys..

I use to have this K&N Kone filter on my CBR150 before back in the days, Also have this mod on my PCX.. working just fine! awsome sound also....
Did remove the Airbox and just put an universal K&N Filter on the carburetor.,

Now my new baby 300R will go the same way! . but im not sure what size in milimeter around my carburetor is? any one have a clue?
Need to find a match so i can order::

K&N Search by Dimension - Round Tapered Universal Air Filter


Cheers!
 

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i am still curious on the size as well. I know the bike is FI, but....it would be neat to pull out the air box for an open filter. I know, to each his own. I like tinkering and being different. I assume the throttle body is pointed to the rear of the bike? Being fuel inject could be a benefit here. You could easy compensate for any extra air with a fuel controller. maybe when the weather is nice and I am really bored and want to take the bike apart, lol...all you need to do I just wrap a string around the bore and then mark it. once you get the size I know you can email K&N tech for help finding the right filter. this has me very interested in being different yet again.
 

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The purpose of the airbox is to keep moisture, lots of moisture being pulled into a exposed cone style airfilter, like when riding in the rains, lots of moisture going into the intake is not a great idea, I have gone out on a sunny clear day and your away from home, and it gets cloudy fast, then before you know it its dumping rain on you and your in the middle of Nowhere, im sure those that have ridden for years know what i am talking about.
Im sure a flat panel K&N filter insert will be made for this bike if that is what you want.
 

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This is the K&N flat screen filter for the CBR300 & 250. It replaces the standard filter and fits straight in. Myself and a few of the guys on this site have already installed it. K&N ship them direct freight free.

HA-2511 - K&N Replacement Filters, Replacement Air Filter

If you want freer flowing then that then you could run with no filter at all in the airbox. As long as you kept the lid on the airbox (Its under the fuel tank, just in front of where the seat sits) you would only get small particles entering your system, but still not ideal.
I really don't think you would see any significant performance gains but it would possibly sound cool :laugh:
 

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This is the K&N flat screen filter for the CBR300 & 250. It replaces the standard filter and fits straight in. Myself and a few of the guys on this site have already installed it. K&N ship them direct freight free.

HA-2511 - K&N Replacement Filters, Replacement Air Filter

If you want freer flowing then that then you could run with no filter at all in the airbox. As long as you kept the lid on the airbox (Its under the fuel tank, just in front of where the seat sits) you would only get small particles entering your system, but still not ideal.
I really don't think you would see any significant performance gains but it would possibly sound cool :laugh:
I found my local auto parts store is a great price compare to msrp. once you have the part number, you order it and bam, nice low price :). kiwi is right, it fits in very nice. not a big hassle either. funny I remember some time back a great hands on test of several air filters on a diesel truck, k&n, Purolator, fram, etc. funny thing was the Purolator had a slight defect in the gasket and still beat the k&n. the k&n was beaten by a coupe of other brands. the Purolator was the regular cotton. they were testing air flow, amount of debris stopped, etc. but....not many choices for us on bikes, so I went k&n. I like the fact it is washable. cost of a cotton that has to be replaced vs a low priced k&n, yeah, k&n wins.
 

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The purpose of the airbox is to keep moisture, lots of moisture being pulled into a exposed cone style airfilter, like when riding in the rains, lots of moisture going into the intake is not a great idea, I have gone out on a sunny clear day and your away from home, and it gets cloudy fast, then before you know it its dumping rain on you and your in the middle of Nowhere, im sure those that have ridden for years know what i am talking about.
Im sure a flat panel K&N filter insert will be made for this bike if that is what you want.


I often wondered about those hyper chargers and cone/spike setups, lol... they are almost like ram air rain suckers. I agree, you can't keep 100% of the water out, but you don't want to suck in gulps. since the cone would be under the seat and not forward facing. it wouldn't be too bad, would it? I mean not as bad as a hyper charger or even open side mount like a screamin eagle or big air style. I am sure the stock air box and location flows more than enough. I have the dyno jet fuel controller. my mix has been richened, and I seem to be fine with just the replacement k&n in the stock box. I know I used to run open filters on my v-twin Yamaha projects. getting the right jets for all that extra air was fun, lol.... the flowed a ton of air. but yes, I tried to stay out of the down poor rains.
 

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however....I just had a thought. though the filter is under the seat and tank area plus the R model has the fairings. I doubt you would have to worry too much about rain. but.....that air box is used to channel air for the engine. the engine will draw the air it needs on that stroke. going with an open filter may not provide extra air, may even reduce it. maybe it won't lean out. maybe it could give a very small enrichment, maybe. I am just not sure if an open filter would really give any adv over the replacement k&n kiwi posted. the engine will pull what it needs given the filter can flow and there are no restrictions. you want more air, you have to force induction, ram air, super charge, turbo, etc.


no would it be different, sure. sometimes I poke around and do stuff to my cars and bikes because it makes it mine. it is personalized. I am still considering the same idea. I have just been very, oh so lazy to see how much of a pain it would be to delete the air box.


sine of a cone filter? gain access to the throttle body. use a micrometer/caliper to measure the opening, or get a tailors/seamstress tape measure. the micrometer you need to use math, the tape measure is measured circumference. I had great success doing this on my v-star and virago. I measured, and emailed k&n. the tech guys found the exact filter for my diameter. you would need to also consider the other dimensions of the filter to make sure it will fit.


good luck.
 
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