Uni filter????

[vicbarber]

Curious to know if anybody has removed the air box and installed a uni filter?

[Ariel Red Hunter]

Originally Posted by vicbarber

Curious to know if anybody has removed the air box and installed a uni filter?

Yes, several have. Although they buy the unifilter with the bend in the connecting hose.

[Republic]

Is that a good filter to use ARH? Assuming we aren't going through water and just mostly highway some dirt riding, would the uni-filter be a benefit?

[pete]

Twin air filters are also very good... built the same as the UNI...

the only draw back of putting a filter directly on the carb is
as the motor draws air it is directly though the filter which slows the air flow
that is why bikes have a air box to give a camber of still air between the filter & motor
for the motor to draw from... no or less restiction to air flow....
most air boxes are not big enough but the space limits the size..

from memory a GXR750 suzuki reqired a air box with 42 liters of still air
at 10,000rpm... no way a air box that big could be put in the frame with all
the other componets needed.... so they had to settle for a 17 liter air box..

if the motor/carb has a back spiting issue the foam filter close to the carb can get
wet with fuel.... that can richen up the fuel mixture...


..

[Adjuster]

Speaking of foam filters can anyone post a link to a foam filter that is surrounded by a rain guard or whatever its called. I have seen them before but now can't find them.


/

[Ariel Red Hunter]

Originally Posted by Republic

Is that a good filter to use ARH? Assuming we aren't going through water and just mostly highway some dirt riding, would the uni-filter be a benefit?

Should be fine. Many people are using them with no complaints. When you ride off road, I would wash out and re-oil the foam every 8 hours. Keep the air filter away from the carburetor. Single cylinder engines are notorious for "woofing" fuel mixture back out of the carb when the inlet valve closes.

[darmst6829]

Air box's are always better. Many motorcycles loose HP by going to an open foam filter and in muddy conditions the bike will ingest dirt and wear out the top end.

[hertz9753]

I bought the Uni Filter but decided not to use it. A member here used one of those to keep his airbox intact with the Uni.

http://www.ebay.com/itm/270761406708...%3AMEBIDX%3AIT

A couple of us went with the K&N filter and used weather stripping on the bracket and grease on the bottom of the filter lip to seal it.

http://www.knfilters.com/search/prod...x?Prod=33-2238

[Ariel Red Hunter]

Originally Posted by darmst6829

Air box's are always better. Many motorcycles loose HP by going to an open foam filter and in muddy conditions the bike will ingest dirt and wear out the top end.

I would say that air boxes are always a good thing to have as long as it does not restrict air flow to the engine. The Hawk air box has to be modified (see Motocheez's video on this subject) to get good airflow through the box. The air hose leading from the air box sometimes is kinked on it's way to the carb. That is a no-no. You want turbulence in the combustion chamber. Not in the intake air/fuel stream. If you ride in heavy dust, sand or mud, you can coat the walls and top and bottom on the inside with grease, which will trap considerable of the stuff before it gets to the filter. Just keep the grease off of the filter element.

[jbfla]

Originally Posted by Adjuster

Speaking of foam filters can anyone post a link to a foam filter that is surrounded by a rain guard or whatever its called. I have seen them before but now can't find them.
/

Adjuster, don't know if this is what you mean:

http://www.knfilters.com/news/news.aspx?id=1235

Years ago I built a rat bike and used a universal bolt-on K&N foam filter.

It came with a reusable/cleanable bag that went over the foam filter to keep out excess dirt and rain.

jb

[Weldangrind]

I've installed this one on several machines: http://www.ebay.com/itm/BLACK-42mm-B...9X0l39&vxp=mtr
The air box on my Lifan was terrible and I didn't trust it to filter all of the air. The pod has been terrific.

[Jmcgee]

Originally Posted by darmst6829

Air box's are always better. Many motorcycles loose HP by going to an open foam filter and in muddy conditions the bike will ingest dirt and wear out the top end.

lose hp? where did you get this information? I have always had an increase, but you must jet the carb and open the exhaust.

[darmst6829]

Originally Posted by Jmcgee

lose hp? where did you get this information? I have always had an increase, but you must jet the carb and open the exhaust.

Maybe a better way to put it is most motorcycles lose drivability and hp after eliminating an air box without other modifications.

[Mudflap]

My preference is an air box, primarily to reduce intake noise but like Weldandgrind my Lifan air box was a poor design. I've used Unifilters for years with good results as long as jetting is adjusted. The filters in the link he posted above are nearly identical to Unifilters but much cheaper. Currently I have them installed on 3 different bikes.

[ben2go]

Non oiled foam air filters will allow fine dust to get through to the engine.