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crankcase breather hose

This is a discussion on crankcase breather hose within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; does anyone make a filter for the crankcase breather hose?...


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Old 06-07-2004, 11:12 AM   #1
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Default crankcase breather hose

does anyone make a filter for the crankcase breather hose?
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Old 06-07-2004, 11:17 AM   #2
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I don't think so but I am sure you can find something at an auto parts store to work. Use your imagination.
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Old 06-07-2004, 11:20 AM   #3
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I used a K&N filter that was designed for a .21 nitro engine from an R/C car. I left the hose on and mounted the filter on top. It is tucked up next to where the snorkel used to be...

You can get these lil filters, foam style even for $5-$20 on Ebay, or your local hobby store..
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Old 06-07-2004, 11:33 AM   #4
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http://www.jlatvproducts.com/catalog/index.htm

i think i found one here
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Old 06-07-2004, 12:42 PM   #5
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I have a question about this yopic, Since the breather hose blows outward, why would you want to filter it?

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Old 06-07-2004, 01:11 PM   #6
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It doesn't always breathe out, when your bike dies(never on a warrior ) or you shut it off it could draw in..
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Old 06-07-2004, 02:27 PM   #7
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Zip tie a peice from some pantyhose(SP) on there. That should be enough of a filter no one will see it and it will filter ok. Cheap and easy. That sounded funny me trying to be all techinical about pantyhose for an air breather.
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Old 06-07-2004, 03:58 PM   #8
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Nitro RC car filters seem to work really well. Not only does it stop stuff from getting sucked in, but also from falling down the tube and into the case. I suppose you can do what dsw warrior350 said. it isn't as refined looking, but it is cheap and gets the job done . For one weekend when I ran without a lid, I just used a rag rubberbanded to it :) . I don't recommend that though :)
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Old 06-07-2004, 04:12 PM   #9
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I think tOj has some sort of aftermarket breather on his warrior.
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Old 06-07-2004, 10:38 PM   #10
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thanks for all of the tips. i am prolly gonna go with dsw warrior350'd idea. lot cheaper than a $20 filter.
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Old 06-08-2004, 08:37 AM   #11
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I think they use a breather hose so water doesnt get in. It would with pantyhose for sure and even with a small filter, just go buy some hose somewhere and connect it to the air box.
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Old 06-08-2004, 01:08 PM   #12
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also the filter will protect it from letting dirt and dust being sucked in
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Old 06-08-2004, 07:35 PM   #13
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I like the filter idea the best, but I don't think panty hose idea is a bad idea. If you keep the breather hose as high as the air filter, the chance of water getting in it is minimal (and if it does, your air filter is under water regardless ;lol: ) . Small dust might find its way in, but it would be very little. Anything small enough to fit past the weave of a panty hose mateiral, is probably smaller then any clutch debris or metal shavings you may have floating around in there anyway.

I personally would feel safer about running an actual filter, but running material over it (as long as the pores are small), shouldn't be too big of a problem. Also, most dust would come by durring operation, and under operation I would think the crankcase preasure would be positive not negative, so vapor would be escaping through the hose, not the other way around.
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Old 06-08-2004, 08:37 PM   #14
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Heres a direct link for the one at JLatv. It looks like a good product i would go with that.http://www.jlatvproducts.com/Merchan...ct_Code=621010
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Old 06-12-2004, 08:17 AM   #15
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Dennis Kirk has one that works really good the part number is 30-1590 $14 I run one on both of my warriors. and my grizzly when I have the air box lid off
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Old 06-14-2004, 06:28 AM   #16
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might try this. Its a fuel filter from wally world
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Old 06-14-2004, 08:37 AM   #17
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I bought a car pvc valve at autozone for 2.99
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Old 06-14-2004, 02:44 PM   #18
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Taco I ran one for a lil while too. There is one tiny lil problem with em though. The crank case pulls and pushes air, but isint a PCV only one way?
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Old 06-22-2004, 03:57 PM   #19
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it appears the pvc that i have will go both ways . .hmm i must investigate further
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Old 07-12-2004, 06:28 PM   #20
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ok who can tell me what the bolt sticking out of the head just above the vent hose does or is for ?
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