Vintage Dirt Bike Q & A

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 Post subject: filter element?
PostPosted: Sat Mar 17, 2018 11:27 am 
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Joined: Thu Feb 08, 2018 10:56 am
Posts: 12
Hi all. Original bits are very difficult to find here in the UK. As I have no filter box cage or lid I will have to rely on a filter element and a bit of diy. What filter elements are you guys using? Especially if the originals are not available?


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 Post subject: Re: filter element?
PostPosted: Sun Mar 18, 2018 11:18 am 
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Joined: Mon Jan 29, 2018 10:50 am
Posts: 15
hello,
my filter box, cover etc. needed to be blasted inside and out after being off the road for 5 years (mice pee), and then painted. easier for me to install a UNI 4300AST dual stage filter. i used a very short section of 3 inch exh pipe to connect from the rubber adapter to the UNI. i selected a filter that was angled slightly up, for clearance to a frame crosspiece. also had to trim the fender a smidge.

can send pics if you'd like, but a little later as i'm going out snowshoeing this afternoon. 22 F : )

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76 r75/6 -- mine since 1980
76 mr250 -- a project, coming along nicely!


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 Post subject: Re: filter element?
PostPosted: Sun Mar 18, 2018 2:20 pm 
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Joined: Thu Feb 08, 2018 10:56 am
Posts: 12
That's interesting. I was thinking of buying some filter foam and having a go at making a filter but your idea sounds good. So yes, any pics would be good. thanks


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 Post subject: Re: filter element?
PostPosted: Sun Mar 18, 2018 2:20 pm 
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Joined: Thu Feb 08, 2018 10:56 am
Posts: 12
That's interesting. I was thinking of buying some filter foam and having a go at making a filter but your idea sounds good. So yes, any pics would be good. thanks


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 Post subject: Re: filter element?
PostPosted: Mon Mar 19, 2018 7:55 am 
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Joined: Mon Jan 29, 2018 10:50 am
Posts: 15
bike is mid-project, but here is a pic of the filter. carb inlet rubber ID and uni filter inlet ID are both around 3inch, so i cut to length a piece of 3inch exhaust pipe. cut length so each end is fully seated, but as short as possible for less overhang. seems rigid enough, but i may secure the assembly to the frame. i still need to fab a shield below the stock fender. i'll be running the stock side covers.
Attachment:
uni.resized.r.jpg
uni.resized.r.jpg [ 153.98 KiB | Viewed 1087 times ]


Attachment:
uni.resized.l.jpg
uni.resized.l.jpg [ 161.55 KiB | Viewed 1087 times ]

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76 r75/6 -- mine since 1980
76 mr250 -- a project, coming along nicely!


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 Post subject: Re: filter element?
PostPosted: Mon Mar 19, 2018 10:14 am 
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Joined: Thu Feb 08, 2018 10:56 am
Posts: 12
Nice job, that should well do the job. I still have the filter box fitted so I will have the filter element fitted inside the box. Your set up could still work with mine. thanks.


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 Post subject: Re: filter element?
PostPosted: Mon Mar 19, 2018 12:11 pm 
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Joined: Sun Nov 30, 2008 12:10 pm
Posts: 1010
Location: Connecticut, USA
Re-Mx has the UNI NU-4012 MT250 air filter, which has a plastic cage built into it and doesn't need the often-lost-or-rusted-out OEM filter cage:

http://re-mx.com/honda-mt250-air-filter

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric


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 Post subject: Re: filter element?
PostPosted: Sun Apr 08, 2018 3:12 am 
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Joined: Sat Jun 03, 2017 1:39 pm
Posts: 10
Location: London , England
I’m using the UNI filter- but probably have an original cage kicking around if you’re looking for one


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 Post subject: Re: filter element?
PostPosted: Mon Apr 16, 2018 7:20 pm 
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Joined: Wed Aug 26, 2015 7:31 pm
Posts: 42
Location: Westford, MA
As Ray mentioned the Re-Mx has the UNI NU-4012 MT250 air filter, which is what I purchased for my restoration.

Works very well.

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Kevin
'74 MT 250
2010 Honda Gold Wing
2009 Kawasaki Concours 1400


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