Posted: 5/16/2015 12:29:11 PM EDT
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I currently ride a 2005 Honda Shadow Aero 750. I swapped out the stock air box with a Thunder Air Kit (TAK), which runs an open K&N filter. There is a oil breather line that runs into the back of the stock air box, and there was not a compatible fitting on the TAK. Initially, I had attached a chrome breather element to the lone and bolted it to the TAK mount. However, I discovered that at sustained highway speeds the oil residue would get all over the side cover, exhaust pipe, and other parts of the frame. During regular in town riding, it builds up over the course of a week or two.
So, I decided to make a few modifications. What I ended up doing was drilling a hole in the baseplate of the TAK and running a hollow bolt for a lightbar foglight through the hole. I then attached the oil breather hose to the bolt and used a hose clamp to secure it, with the theory that, since the stock air box has a similar setup, it would not hurt the engine. However, I am still getting the oil residue on the side of the bike. I tried taking some oil dry cloth and lining the inside of the filter (basically making a "C" shape) on the back side to try to soak up the oil spray, but it did not seem to work. Anyone have any ideas on how I can keep the TAK installed and lose the oil spray? Yes, I posted the question on a couple of bike forums, but I got nothing. |
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I have used a Gold Wing crankcase breather separator on several different bikes to reduce the amount of oil being pulled into an aftermarket air filter.
It has three ports, one is connected to the hose coming from the crankcase, another goes to the air filter nipple, and the third on the bottom of the breather is a drain for the accumulated oil. This port has a plastic plug that must be removed to drain the oil about 3-4k miles or so. Should not be to hard to make one. |
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Quoted:
I have used a Gold Wing crankcase breather separator on several different bikes to reduce the amount of oil being pulled into an aftermarket air filter. It has three ports, one is connected to the hose coming from the crankcase, another goes to the air filter nipple, and the third on the bottom of the breather is a drain for the accumulated oil. This port has a plastic plug that must be removed to drain the oil about 3-4k miles or so. Should not be to hard to make one. I wonder if I could use a T-fitting and the stock oil catch nipple in my existing setup... What I mean is: cut the hose going from the crankcase to the air intake, insert a t-fitting to connect the hoses back together, and put a catcher on the bottom of the t-fitting...or would the oil just flow past the fitting? |
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Not appropriate in a tech forum - T Let me guess...something along the lines of "buy a H-D and you won't have these issues...MURICA!" 
I went to Autozone (and I am still amazed at how much shit I can find for my bike there, and at Lowes) and got a vacuum line T-fitting and a rubber vacuum cap. There was not enough room to put it inside the filter housing, so I ran the hose to the t-fitting, and stuck the other end of the fitting in the hole I drilled in the baseplate of the intake. I put the cap on the part of the t-fitting pointing down, and it feels like there is plenty of room left to catch oil, so we will see how well it works this week. |
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This is what happens with a poorly designed aftermarket kit or something that someone cobbled together with miscellaneous parts.
Most V-Twin cruisers have a long stroke (even a 750). With that long stroke comes a lot of crankcase pressurization. Most manufacturers deal with this by putting the breather tube somewhere in the airbox. They also use the breather tube in the airbox as a pollution control device. Because of the crankcase pressurization issue a lot of oil gets "pumped out" of the crankcase. Also, if the rings are worn the crankcase will have blow-by pressurizing the crankcase. All of these conditions will blow oil out the breather tube. You are suffering the effects of a too small airbox and not enough intake vacuum to suck the oil into the aftermarket airbox due to the open air filters. Street guys and old time road racers used to use a length of hose and put it into a bottle strapped to the frame with another breather hose that vented to the rear of the bike out past the fender. You might try that. Google up "motorcycle oil catch tank", there are a lot of ideas out there. |
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Can also use a section of maglite and a valve cover filter. Where exactly is it leaking in your current design? Modify that area instead of a whole system would be the easiest route. I missed the edits, but even HD has those breathers dumping into the intake ;) It was running to a breather filter only. I got tired of cleaning up oil residue, so I drilled a hole in the baseplate of the Air Kit and ran the line to that. However, i still had the same issue. What I did to fix it was insert a t-fitting between the Air Kit and hose, with a vacuum tube cap on the bottom of the t-fitting to catch any oil. |