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Old Dec 22nd, 2008, 7:02 pm   #1 (permalink)
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What does your breather vent look like?

I have an aftermarket breather and was told to run 2 feet of hose from it up to the rear of the bike and put a small filter on it. I've seen this on several bikes. Another rider said to just put a small (K&N style) filter right on top. What way is best and why?
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Old Dec 22nd, 2008, 7:17 pm   #2 (permalink)
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I am guessing your refering to the crankcase breather. I have an STM breather with 14" of rubber tube attached, with a K&N fiter at the end. Oil collects in the tube and drains back into the case rayher than blow all over the rear wheel. seems to work
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Old Dec 22nd, 2008, 9:37 pm   #3 (permalink)
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Back in the old days, bikes had a breather tube that typically ended somewhere under the crankcase or transmission. They blew oil all over hell and made a real mess of things. The long tube/high outlet with a filter is an answer to that. As ian966 states, the idea is to have a long enough tube, routed high enough, so that the oil that gets blown into it just drains back into the motor. Instead of all over the bike and the ground. So, like other things in life, longer and higher is better. Incidentally, the filter is for keeping crap out of the motor, not for filtering the stuff blowing out of the motor. Keeping it oil-free by mounting it high, at the end of a long hose, helps it do its job better.
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Old Dec 23rd, 2008, 4:35 am   #4 (permalink)
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the mh900e has a special part fitted beneath the
breather valve, to give way for the mh's special
high-up exhaust*, i have simply attached a ~22"
hose to it, with no filter yet.

nice "in flow" installation, check great work on the
tappered header also.









*so the new monster should have a similar part ?

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Old Dec 24th, 2008, 12:01 pm   #5 (permalink)
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Got it. Thanks for the info, guys!
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Old Dec 24th, 2008, 7:43 pm   #6 (permalink)
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Quote:
Originally Posted by ian996 View Post
I am guessing your refering to the crankcase breather. I have an STM breather with 14" of rubber tube attached, with a K&N fiter at the end. Oil collects in the tube and drains back into the case rayher than blow all over the rear wheel. seems to work
Would you mind posting a pic of this setup? Thanks!
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Old Dec 25th, 2008, 8:33 pm   #7 (permalink)
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I changed mine to gain easier access to the preload adjuster.
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Old Dec 26th, 2008, 6:00 am   #8 (permalink)
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Pardon my ignorance, Ric, but does yours work in the same manner as ian996's? I wouldn't know a breather valve from a... well, I don't know what

I would like to get rid of my OEM setup but a) I don't want oil all over my rear wheel and b) I don't want to pay $100 for a billet breather if a simple filter and length of hose will do.

Thanks!
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Old Dec 26th, 2008, 8:27 am   #9 (permalink)
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Quote:
Originally Posted by number9 View Post
Pardon my ignorance,
there is a breather valve on your bike already,
the billet part is just a replacement.

the breather valve is the little round thing, that is
screwed into the engine case directly, with a flap
valve inside, comparable to those to be found in
2 stroke engines. Take a closer look, it is a black
plastic part on Ric's bike.

so Ric and Ian996 have got basicly the same set-up,
with Ric's hose to the K&N filter being very short,
not allowing to collect too much oil to flow back to
the cases as intended with Ian's 20" hose.

i have seen many different applications, with or
without hose, and with hoses in various lenghts,
i would go with something Ian has intended, but
have as said a rather long hose routed to the
rear of my bike with no filter at all.

original set up has a breather valve, that is routed
to the catch canister, on from thereon to the airbox,
not to blow oil remains into the environment but
into the airbox.
If you disassemble this set-up from your bike, you
are asked to close the then appearing hole in your
airbox.

cheers.






as it is christmas, see this picture of a dis-assembled
nichols breather, the two pedals are
clearly visible, they are blown open by the
engine's pressure and close themselves
afterwards, so are basicly flapping all the
time, never actually closing at high revs
eventually, as the ones on the 2 stroke bikes.


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Old Dec 26th, 2008, 8:48 am   #10 (permalink)
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Quote:
Originally Posted by number9 View Post
Pardon my ignorance, Ric, but does yours work in the same manner as ian996's? I wouldn't know a breather valve from a... well, I don't know what

I would like to get rid of my OEM setup but a) I don't want oil all over my rear wheel and b) I don't want to pay $100 for a billet breather if a simple filter and length of hose will do.

Thanks!
The stock setup is really the "safest" way to go if you are concerned about oil on the rear.The stock breather works fine if it is installed properly with a good gasket and a dab of sealant on the threads.I was using my 900 on the street and track,and needed to make preload adjustments for both.The stock hose and underseat box is in the way.The biggest reason people get oil breather leaks is from overfilling the cranckcase.(imho) A local shop should be able to get you a filter with an inlet size the same as the breather's o.d. Then just find a piece of tough oil proof hose to connect the two.I had to insert a piece of hard pvc plastic pipe inside the filter so that the hoseclamp wouldn't crush the soft rubber.
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