09-24-2016, 03:36 PM | #1 |
Join Date: Aug 2016
Posts: 27
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Uni filter????
Curious to know if anybody has removed the air box and installed a uni filter?
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09-24-2016, 04:13 PM | #2 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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Yes, several have. Although they buy the unifilter with the bend in the connecting hose.
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09-24-2016, 04:55 PM | #3 |
Join Date: Jul 2015
Posts: 118
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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?
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09-24-2016, 05:16 PM | #4 |
Join Date: Jan 2012
Location: ChCh , NZ
Posts: 2,265
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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... ..
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09 XT660R ... 06 TTR250 ... 80 Montesa H6 125 Enduro... 77 Montesa Cota 348 MRR "Malcom Rathnell Replica"... Current resto projects.. 81 Honda CT110... 80 Kawasaki KL250A1... 11 Husaburg TE125 enduro... "sold" along with another 31... Lifan 125 Pitbike.. "stolen" ... KIWI BIKER FORUM...... http://www.kiwibiker.co.nz/forums/content.php All the best offroad rides in NZ... http://www.remotemoto.com/ E-mail... xtpete1@gmail.com Last edited by pete; 09-24-2016 at 07:00 PM. |
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09-24-2016, 05:40 PM | #5 |
Join Date: Dec 2014
Location: Deerfield Beach FL
Posts: 1,410
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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.
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09-24-2016, 10:02 PM | #6 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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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.
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09-24-2016, 10:45 PM | #7 |
Join Date: May 2016
Location: Redmond WA
Posts: 42
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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.
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09-24-2016, 11:42 PM | #8 |
Join Date: May 2016
Location: Bismarck, ND
Posts: 868
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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
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2015 and 3/4 RPS Hawk 250. Most people would call it a 2016 but the MCO didn't. |
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09-25-2016, 09:34 AM | #9 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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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.
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09-25-2016, 11:29 AM | #10 | |
Join Date: Oct 2015
Location: FL, GA, NC
Posts: 771
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Quote:
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
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2016 Honda CB500F......2017 Triumph Street Twin 2014 XT 250........ |
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09-26-2016, 12:12 PM | #11 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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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.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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10-22-2016, 09:46 AM | #12 |
Join Date: Sep 2016
Posts: 86
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lose hp? where did you get this information? I have always had an increase, but you must jet the carb and open the exhaust.
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10-22-2016, 11:15 AM | #13 |
Join Date: May 2016
Location: Redmond WA
Posts: 42
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Maybe a better way to put it is most motorcycles lose drivability and hp after eliminating an air box without other modifications.
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10-22-2016, 11:47 AM | #14 |
Join Date: Sep 2014
Posts: 1,913
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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.
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10-22-2016, 12:02 PM | #15 |
Join Date: Jun 2011
Posts: 1,335
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Non oiled foam air filters will allow fine dust to get through to the engine.
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