Topic: Help a brother out about crankcase vent filters

[RSV12K]

Okay, I did a search and I'm still not clear what to do. I have a hose running from the valve cover and one from the crankcase. I believe most people leave the top breather hose sorta dangling when they're running pods. However, they do a filter on the crankcase hose.

K&N makes a crankcase filter but I have no idea what size fits the hose--looks like it might be about 1/2" but I'm guessing. What also throws me off is there are two kinds of K&N filters--one male and the other is female. Got any ideas which filter I should try and better yet, do you have a model number? Am I right in saying they valve cover hose just wants to be free (no filter)?

I came, I searched, I lost. Thanks in advance.

[RSV12K]

I'm bumping because I be still hoping some kind soul will respond.

[physician]

750? 550?

on my 550 i installed a breather filter under the seats on the end of a hose. inthis case i should have use a male filter to fit inside the hose, but i find a cheap female so a .75$ treades nipple from the plumbing department solve the problem.

i installed the filter under the seat because it was a bit to tight to fit uneder the tank, directly on the head.

i hope it help you!

where did your crank case tube use tu plug? ( the non crankcase end) youcould use a t fitting to use only 1 filter under the seat ( if your cheap like me ) it will still do the same job as 2 independants filters

[TwoTired]

I'm bumping because I be still hoping some kind soul will respond.

I would nave responded, but, no offense, I get rather weary of always having to play 20 questions before providing info that can be used.   Lately, I've begun ignoring posts where enough data is omitted, that a concise response is impossible.  I'm probably getting pretty close to "forum fatigue" and will just have to wallk away for awhile.
The engine breather system varies with the model and year of the vehicle.  There are 10 models of SOHC4 spanning over 10 years production.

Cheers,

[ProTeal55]

This isnt a big deal two tired, the guy is just asking for help (thus the point of this forum)...

You can kinda do whatever u want with the breather.
Some people just run a hose and have it dump/end somewhere under the bike (out of sight).
Some people run the hose from the breather to a small filter (like I did on my CB750).
I have even seen some people run a small filter right off the breather nipple (on the motor) itself.

[seaweb11]

Is this what your getting at?

[Jerry Rxman Griffin aka MuthaF'er]

I'm bumping because I be still hoping some kind soul will respond.

I would nave responded, but, no offense, I get rather weary of always having to play 20 questions before providing info that can be used. Lately, I've begun ignoring posts where enough data is omitted, that a concise response is impossible. I'm probably getting pretty close to "forum fatigue" and will just have to wallk away for awhile.
The engine breather system varies with the model and year of the vehicle. There are 10 models of SOHC4 spanning over 10 years production.

Cheers,

TT,

If you take another sabbatical PLEASE check in occasionally and just say hello. We were all worried last time.

Jerry

[RSV12K]

I would nave responded, but, no offense, I get rather weary of always having to play 20 questions before providing info that can be used.

Two (Too) Tired, you are aptly named, I'll give you that. One other time I asked a question, your "contribution" was another smarmy reply, so yes, I am offended. I apologize for not having said I have a CB750K7; it was a dumb oversight. If you don't want to respond to a question. you should it ignore it,  don't but I don't deserve your Lord of the Jungle attitude either.

Should I put a filter on the hose that comes out of the valve cover?
Should I put a filter on the hose that comes out of the crankcase.
What size filter(s) do I need and if it's the one sold by K&N, it would be terrific if you could give me a part(s) number.

Thanks again.

[Bodi]

Well, I'm on TT's side.
I started to try and reply yesterday but found no answer that wasn't a bit rude.
RSV12K gives no model or year, the 2 vents suggest a 750 but maybe other models have both too. He has the bike there, presumably, but expects us to measure the tube (what bike? what year? stock or replacement tube? I don't have the bike here.) then look at a catalogue, pick the filter we like and then specify the part number. Ten minutes with a ruler and a computer and he has done it himself. Hopefully he doesn't need us to pay for and install them.
There are a lot of experienced people here glad to help someone in need. Having an interest in these machines and learning the ins and outs of working on them - great, ask away. If you want someone to do the work for you, find a mechanic: that's how they make their living.
As for the technical question, the vents can suck in - dry sump engines especially as the scavenger pump works, either draining a filled sump or just pumping air - so a filter helps to protect the engine from dirt.

[ProTeal55]

" Should I put a filter on the hose that comes out of the valve cover? " - Sure
" Should I put a filter on the hose that comes out of the crankcase. " - U can do that as well..
" What size filter(s) do I need and if it's the one sold by K&N, it would be terrific if you could give me a part(s) number." - Not sure about the size, but those little generic filters you find at autopart stores in the "high performance" section fit like a champ..No need to make this harder than it is, and def. not a need to spend the big $$ for a k&n filter for this application. All the filter is for it so keep crap from coming in the hose (not like that is gonna happen anyways)..

I picked up a little filter from the local v-twin/hd shop and mouted it on the side of my 750. You can get these filters for about 15 bucks...

[RSV12K]

Well, I'm on TT's side. There are a lot of experienced people here glad to help someone in need. Having an interest in these machines and learning the ins and outs of working on them - great, ask away. If you want someone to do the work for you, find a mechanic: that's how they make their living.
As for the technical question, the vents can suck in - dry sump engines especially as the scavenger pump works, either draining a filled sump or just pumping air - so a filter helps to protect the engine from dirt.

Dude, you have issues. You just spent more time busting my balls than it would have taken you to answer my horribly phrased question.. Like I said, I made a mistake by forgetting to say what bike I have. I'm not asking anyone do for me what I could easily do for myself. If someone has already resolved this question, it would be easy for them to provide the answer, at least I would do it to give back all that I have received from forums like this one. It's not like I don't have a clue. I built my bike from the ground up and a more forgiving member of this forum nominated it for bike of the month a few months ago, so I don't need to be condescended to either.



Meanwhile, ProTeal thank you for your patience and your reply.

[merc2dogs]

where's the seat from?
like it.

Ken.

[RSV12K]

where's the seat from?
like it.
Ken.

I started with the stock seat. Sent the pan out to be powder coated and when it came back, I sculpted the foam into the shape I envisioned. Then, I sent the pan and foam to Sargent Cycle, which added a thin layer of their comfort foam, or whatever they call it, on top of the stock foam and what you see is what I got. Sargent had to add the  layer of foam--maybe an inch--because to get that shape, the stock foam had to be thinner in the seating area than everywhere else. I could have left it the way it was, but the seat would not have been comfortable after an hour or so.

[merc2dogs]

 It turned out nice!
 I've got short legs, and prefer a short seat, but most of them I see just don't come together right, That one did!

  Have one I built a bit ago turned out alright and comfortable, but not realy low enough, been checking out seats, and the only ones I'd seen that were both low enough, and looked good were the bubble backs, till I saw that one!

Thanks
Ken.

[ProTeal55]

Meanwhile, ProTeal thank you for your patience and your reply.

Not a prob. sir, thats why I am on this site.
To help when & where I can, and hopefully get the same back when I am in need of guidance..

[seaweb11]

Funny.......I thought my photos would have cleared up at least one of your questions