Breather box filter material - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 12 Old 07-23-2018, 07:48 AM Thread Starter
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Breather box filter material

While replacing air filter, went to clean the mesh filter for the breather and it has disintegrated.

Searching the forum, can't seem to find what exactly is acceptable for a replacement.

Some recommend a metal scouring pad, others say no to that.

Breather box is 4 " deep, does it need to be completely filled?

Last edited by LL Fauntleroy; 07-23-2018 at 07:52 AM.
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post #2 of 12 Old 07-23-2018, 08:55 AM
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No, no metal. Go by any lawn mower shop and ask for a coarse foam pre-filter. If I remember right, mine is only about 3" tall and it's just shoved down in that slot. I think it's on'y purpose is to contain oil spray, or oil that gets burped up in a tip over.

Suzuki calls it a ".FILTER, BREATHER
13788-11J00" & it's $10 before shipping
dudu and MAZ4ME like this.

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Last edited by Motor7; 07-23-2018 at 09:00 AM.
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post #3 of 12 Old 07-23-2018, 09:59 AM Thread Starter
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Would this work ? Pondmaster Danner 12730 Foam Pre-Filter off amazon
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post #4 of 12 Old 07-23-2018, 12:09 PM
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looks good as long as it is resistant to oil, which it most likely is.

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post #5 of 12 Old 07-25-2018, 04:04 PM Thread Starter
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What happens if I don't replace this? Still waiting for the filter that may not work.

To make matters worse, I threw out the newly purchased hiflo reg air filter by mistake keeping an old one, had the same box. while cleaning out the garage,
no good deed goes unpunished
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post #6 of 12 Old 07-29-2018, 11:41 AM Thread Starter
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This works perfectly.

There is a cut out in the middle that fits the breather box cut out just right. The filter sits on a ledge so only a couple of inches deep

I soaked a test piece in oil for the past week or so, no degradation.

So if you need to replace the breather box filter material, here is an option. I have enough left over for several replacements, but by that time, the bike will be an antique and I will probably be long gone
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post #7 of 12 Old 09-03-2018, 03:57 PM
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Forgive my ignorance, but I'm assuming the breather filter is supposed to be located in the air box in the left rear corner? I have a capped fitting there and a bypassed capped fitting on top of my rear cylinder that I assume is supposed to be a crankcase vent. My bike has multiple capped bypassed lines &#x1f615;
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post #8 of 12 Old 09-03-2018, 06:20 PM
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Quote:
Originally Posted by bdgrbob99 View Post
Forgive my ignorance, but I'm assuming the breather filter is supposed to be located in the air box in the left rear corner?
Correct. There is a pocket built into the air box. The filter foam goes in there, at the bottom there are two nipples for connecting a front and rear breather tube (only one nipple and one breather hose on the gen2 Wee). The hot combustion and crankcase oil vapors are sucked into the intake through this system and the filter foam condenses some of the oil vapor so it drips back down into the engine instead of being burned.


Quote:
I have a capped fitting there and a bypassed capped fitting on top of my rear cylinder that I assume is supposed to be a crankcase vent. My bike has multiple capped bypassed lines &#x1f615;
The capped fitting on top of the rear cylinder is part of the PAIR system (see attached pic, circled in red) and not part of the crankcase breather system. It injects air into the exhaust stream to burn off un-burned gas so it doesn't pollute the air and cause smog. Riders sometimes cap that system if they have an aftermarket exhaust because the PAIR system can cause annoying popping noises out of the exhaust pipe. Removing it doesn't help or hurt the bike performance-wise but does makes it more smoggy.

On the other hand, if the previous owner capped the crankcase breather tubes then that would be bad. Combustion gas from piston ring blow-by will cause pressure to build up in the crankcase and eventually cause problems, like blowing out an oil seal. Racers will bypass the crankcase breather system and just vent to the atmosphere with a crankcase breather filter because burning crankcase fumes does lower the power (ever so slightly).
Attached Images
File Type: jpg PAIR01.jpg (182.0 KB, 2 views)

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post #9 of 12 Old 09-03-2018, 06:38 PM
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Quote:
Originally Posted by dmfdmf View Post
Quote:
Originally Posted by bdgrbob99 View Post
Forgive my ignorance, but I'm assuming the breather filter is supposed to be located in the air box in the left rear corner?
Correct. There is a pocket built into the air box. The filter foam goes in there, at the bottom there are two nipples for connecting a front and rear breather tube (only one nipple and one breather hose on the gen2 Wee). The hot combustion and crankcase oil vapors are sucked into the intake through this system and the filter foam condenses some of the oil vapor so it drips back down into the engine instead of being burned.


Quote:
I have a capped fitting there and a bypassed capped fitting on top of my rear cylinder that I assume is supposed to be a crankcase vent. My bike has multiple capped bypassed lines &#x1f615;
The capped fitting on top of the rear cylinder is part of the PAIR system (see attached pic, circled in red) and not part of the crankcase breather system. It injects air into the exhaust stream to burn off un-burned gas so it doesn't pollute the air and cause smog. Riders sometimes cap that system if they have an aftermarket exhaust because the PAIR system can cause annoying popping noises out of the exhaust pipe. Removing it doesn't help or hurt the bike performance-wise but does makes it more smoggy.

On the other hand, if the previous owner capped the crankcase breather tubes then that would be bad. Combustion gas from piston ring blow-by will cause pressure to build up in the crankcase and eventually cause problems, like blowing out an oil seal. Racers will bypass the crankcase breather system and just vent to the atmosphere with a crankcase breather filter because burning crankcase fumes does lower the power (ever so slightly).
Referencing your picture, what I thought was a crankcase filter is the PAIR system. I'll leave that be I suppose, however, I noticed I do not have any hoses hooked up to the Left rear nipples on the air box where the crankcase breather hoses are supposed to be. Where should they hook up to the cylinders? Also, it appears the 2 lines off my front and rear throttle bodies that come into one line is capped as well.

All today started out with was a plug swap and hopefully a TB sync...sigh
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post #10 of 12 Old 09-03-2018, 07:55 PM
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Quote:
Originally Posted by bdgrbob99 View Post
...however, I noticed I do not have any hoses hooked up to the Left rear nipples on the air box where the crankcase breather hoses are supposed to be.
You should update your account info or sig to include your model/year. Those pics/links I posted are for the Wee. There are important differences between Wee -vs- Vee and by year (i.e. gen1, gen2, gen3, etc). I pulled a fiche-pic for a 2005 Vee and the nipple on the left (see attached pic, circled in red) is for draining the airbox if you drop the bike and it fills with oil, so that is nothing to worry about. Unlike the Wee, the Vee breather filter pocket and nipple is in the front right hand corner (circled in green) so check if that has a hose attached and you should be fine regarding the crankcase breather circuit. I don't know where it terminates on the crankcase but it is really only a problem if someone plugged it at the airbox.

Quote:
Also, it appears the 2 lines off my front and rear throttle bodies that come into one line is capped as well. All today started out with was a plug swap and hopefully a TB sync...sigh
I saw your other thread, post pics, diagram or more info if you want help. I'm not familiar with the Vee so I can't comment.
Attached Images
File Type: png DL1000.png (96.6 KB, 1 views)

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---------------------------------------------------------------------------------------------
Current: 2014 V-Strom DL650 ABS Red
Next Up: ?
Past: Suzuki: DL650AK7, GS400; Honda: CB125, Express 49cc
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