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The oil on the filter will make it water resistant, but not water proof, if you are out riding and its raining hard, i would suggest parking under a bridge or something. You may also want to research, outerwears air filter covers. Outerwears makes covers for air filters, that are supposed to keep water out. Another thing you could do is put a 8" round cover over the filter, this would still give it room to breathe.
Without a "sock" or something else to protect the filter, you'll drown out the motor, not a good thing. Not sure if anyone even makes a "sock" for that filter, main reason why I went with the HD heavy breather. Maybe someone will chime in on this, whether there is a cover that works or not.
I have a Big Sucker on my Softail and I ran it open like yours for quite a while and never had a problem in the rain, but we don't get rain as often here in CO as you do in GA. I did go back to putting the factory "football" cover back on for now and it does help keep the bugs out of the filter which was the biggest drawback that I noticed with running it open.
There are a few companies that make the rain socks that fit the ness filter. I've run mine naked for a couple years and though I've been in light rain with no real issues anytime it sat exposed to falling rain while parked (or especially washing the bike) it would not only wash dirty oil all down the side of the bike off the filter but it choked the motor out until it dried. I did get caught in a quick downpour this spring and before I could pull over under an overpass the water was already choking the filter.
It looks cool but running open it gets dirty a lot faster requiring cleaning and re-oiling more often. I think I'm just going to co back to a round cover in the future like the HD nostalgic or a ness cover.
When I first put my Big sucker on I left it exposed, Thought it looks cooler, But my more experienced freinds told me not good in the rain. I put a stock football cover of a 03 roadglide and no problems. I ride in the rain all the time so far I haven't had any problems.
Opted for the Big Sucker cast alumimium/chrome round cover below. The front of an exposed Big sucker filter loads up with bugs and grime real quick. Always carry a rain sock.
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