Maintenance & Technical > KX500 Original

removing airbox

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CAduner:
I agree with sly about the quality of the air that is filtered through a foam air filter compared to a K&N.  I used to have a 87' 250r that I removed the airbox on and ran a K&N.  I noticed a huge increase in power on top, but I think that is due to the volume of air entering the carb.  However I did notice that there was a small trace amount of very very very fine dust in the boot that connects the airbox to the carb.  If I were to ride anywhere but the sand I would never run a bike without a airbox, I dont think the gain in power is justified due to extra work needed to clean the bike.

alan:
We may want to make this a "Sticky" and maybe rename it "Airflow & Filters", anyway just a thought!

I do agree it depends on where you ride, if you are riding in the dunes or where you are in a lot of water, I would never run without an airbox.

I guess I settled on Twin air filters, not to sure why, but I never see any fine crap inside when I remove it for cleaning.

In my 700 V Force Quad I run K&N with skins. The filter is such a pain in the ass to change it is just easer to change out the skin.

Alan :-D

FuriouSly:
CADuner

--- Quote --- I noticed a huge increase in power on top
--- End quote ---
are you saying that the K&N gave more air flow for you up top?


--- Quote ---However I did notice that there was a small trace amount of very very very fine dust in the boot that connects the airbox to the carb
--- End quote ---
you had fine dust with a properly oiled K&N?


--- Quote ---I dont think the gain in power is justified due to extra work needed to clean the bike.
--- End quote ---
extra work cleaning the filter?

I think a K&N has its place, just not in a dirt bike.  I have seen a K&N for a KX500 I am pretty sure,  it fits in the airbox and replaces the foam filter in the exact size and space.  Anyone used one before like this??

just wondering about these commments...  Sly

mg82:
i gonna get it apart and see what i can come up with.

KXcam22:
The airbox does a lot of directing of air into the carb, but at the expense of ultimate max airflow.  Generally replacing the airbox with a clampon filter will sacrifice power below 1/2 throttle (when the carb air velocity is low there is more turbulence at the carb mouth than the carb intake can fully overcome) but then gain power above this due to outright increased airflow.  I did this to my roadracer and the effect was apparent (and I was looking for top end).  For top end specific type racing this is usually a good mod.  I would suggest building a velocity stack with a filter on it to further enhance the air flow. As to filter types, I still prefer foam but I have K&N's on all my vehicles.  I have heard of the fine dust rumour but don't know if I believe it. It would be nice to talk to someong who races dune buggies in the dez.  He would know for sure if fine stuff gets through. Let the debate rage! Cam.

PS. I once read a tech article that showed how airbox resonance combated turbulence and increased airflow at certain RPM's. Quite fascinating.

PSS.  Who wants to try the first KX500 ram air box??

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