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Discussion Starter · #1 ·
I know that over filling can cause this but it didn't do it until just before the oil needed changed. Does anyone know why this happens when the oil is not over filled? HELP!!!!!!
 

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Discussion Starter · #2 ·
HELP!!!!!!!!!!!!!!!
 

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If you figure it out let all of us know. Most of the time it's because of being overfilled, others is much later like yours. No one knows for sure.
 

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Discussion Starter · #7 ·

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I've been using Suzuki 20W-50 petroleum based oil, and at near 14,000 miles, have never had a problem with oil in the breather. So there may be some truth to that, but I doubt it.
 
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It's not the Amsoil. I use it, no problem. It's also caused by dirty air filters causing higher vacuum. downshifting too early with high deceleration revs is also a cause. High revivng a cold engine does it too, especially if it's parked on the sidestand at the time. But it takes awhile to flow up to the airbox and out the filter, usually after you've ridden and stopped, so most don't make the connection. If you've got stock air filters, a switch to K&N's or a high flow filter mod has been shown to cure it. It happens when the airflow from the crankcase is increased and pulls oil with it. When the oil level is higher such as over filling it takes less airflow to do it. And adding a catch can as some have done is not a fix. It just sends the oil somewhere where you don't see it and can lead to low oil levels.
 

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It seems a little early but some people have had success changing back to a non synthetic oil. Usually there millage was higher but you can give it a shot.
Yes Ryan, i've changed back to non-synthetic,,, and have not had a problem. It's strange,, i KNOW that i had the correct level with Synthetic, checked it bunch of times. AND,, when i went to change it the last time... 5000miles..... oil low and filter covered.
Again, no problems with Non-Synthetic
 

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And adding a catch can as some have done is not a fix. It just sends the oil somewhere where you don't see it and can lead to low oil levels.
Pegasus, the reason the catch can works is because the crankcase is no longer subjected to the vacuum in the intake. As you said, high vacuum sucks the oil up. With a catch can the only way the oil comes up is for crankcase pressure to push it up.

Most that do this only get enough blowby mist into the catch can to create a few drops in it over hundreds of miles.
 

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Discussion Starter · #14 ·
Big thanks to everyone who replied. It looks like my problem has been solved (special thanks to square rounder for all of his help) by using the crankcase filter behind the ignition key and blocking off the hose going into the left intake. It takes a little time to clean up all the oil and install the filter but it looks like a good cheap (under $11.00) fix. Thanks again to everyone.
 

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Pegasus, the reason the catch can works is because the crankcase is no longer subjected to the vacuum in the intake. As you said, high vacuum sucks the oil up. With a catch can the only way the oil comes up is for crankcase pressure to push it up.

Most that do this only get enough blowby mist into the catch can to create a few drops in it over hundreds of miles.
Yep :agree: only a teaspoon of oil ever caught in my "oil catch can" in thousands of miles. Never even enough to drain. I NEVER overfill or had overfilled my oil when this was happening either.
 

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This has been discussed a lot. purvistechie has used this setup I created a link on how to do.

Last year I had enough of playing the game and cleaning the bike all the time. I never felt I've had a problem with overfilling mine but now I don't worry about it as much.

I've gotten some oil in the catch can but not a lot.

http://www.m109riders.com/forums/showthread.php?t=117146&highlight=Oil+Puke
 
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Pegasus, the reason the catch can works is because the crankcase is no longer subjected to the vacuum in the intake. As you said, high vacuum sucks the oil up. With a catch can the only way the oil comes up is for crankcase pressure to push it up.

Most that do this only get enough blowby mist into the catch can to create a few drops in it over hundreds of miles.
Doing it that way, I can see how it would work. Heck you don't even need the can for that, just a filter at the end of the hose. There's still 2 drawbacks though. 1, you're not getting the top end lubrication that routing the oil mist to the intake provides, 2, States that are going to emissions testing/inspections for motorcycles like CA. will at the very least require you to route the vent hose back to the airbox if not make you remove the catch can. And of course like with the exhaust systems, there will be fines for that.Yes, it is little to nothing that is comming out of the motorcycle, but it is still bad for the environment. Do you want to be part of the problem? Or part of the cure? But I agree that it's better than having oil all over the bike. But if some bikes do it and most don't, there has to be a cause for it that can be fixed without adding a catch can. That cause still needs to be identified and dealt with. It has to be something that allows more vacuum and or air flow in the crankcase forcing the oil out with it. Fix that and you've got a real cure. Mine doesn't do it so I can't find what isn't happening. Someone who's having the problem (or Suzuki ha ha) needs to find the real cause and fix it right. Technically Suzuki can be forced to fix it as it is a violation of the Clean Air Act at a corporate level to produce a vehicle that puts oil into the environment. If someone with the problem would bring it to the attention of the EPA, they would make sure that Suzuki fixed it.
 

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1, you're not getting the top end lubrication that routing the oil mist to the intake provides"
You think that the oil going to the airbox is intentional to lubricate the top end? I beg to differ on that.

2, States that are going to emissions testing/inspections for motorcycles like CA. will at the very least require you to route the vent hose back to the airbox if not make you remove the catch can. And of course like with the exhaust systems, there will be fines for that.Yes, it is little to nothing that is comming out of the motorcycle, but it is still bad for the environment.
I agree that some states that have emission testing may not look kindly on this fix. But I contest that keeping raw oil from spilling is much better than a little "dirty" air getting out.

Do you want to be part of the problem? Or part of the cure? But I agree that it's better than having oil all over the bike. But if some bikes do it and most don't, there has to be a cause for it that can be fixed without adding a catch can. That cause still needs to be identified and dealt with. It has to be something that allows more vacuum and or air flow in the crankcase forcing the oil out with it. Fix that and you've got a real cure. Mine doesn't do it so I can't find what isn't happening. Someone who's having the problem (or Suzuki ha ha) needs to find the real cause and fix it right. Technically Suzuki can be forced to fix it as it is a violation of the Clean Air Act at a corporate level to produce a vehicle that puts oil into the environment. If someone with the problem would bring it to the attention of the EPA, they would make sure that Suzuki fixed it.
I kind of agree here except for being part of the problem. I truely believe that I'm helping the environment far more than hurting it by keeping oil from spilling. I say it's the lesser of two evils. I agree that Suzuki should step up and fix the problem, I also don't think that Suzuki will. I fixed the problem the best way that I could. Again I contest that catching the oil before it spills is a much better thing and far outweighs a little crank case air that's released.

Now, all the above being said makes me think. What if a change was made to the design that incorporated an oil catch INLINE on the ORIGINAL layout? That way the factory design to re-introduce the crank case air to the engine to re-burn it would remain intact and the oil would be prevented from reaching the airbox. This would be a good option for those who need to be tested for emissions. Just an idea.
 
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