In a Harley Davidson motorcycle, slobbering oil, also known as oil carryover, is a common problem caused by deteriorated, cracked or improperly attached backplate air filter bolts or tubes. Re-route the back of the air plate on a Harley Davidson to prevent oil splatter and misting with instructions from a certified motorcycle technician in this free video on Harley Davidson motorcycles.
Hi, I'm Jeff Jannett, Certified Harley Davidson Master Technician, with South Side Choppers, in St. Pete, Florida. Did you know that slobbering, also known as oil carryover, is a common problem on many Harley Davidson's, especially the sportster family? My name is Jeff Jannett. I'm a Master Technician, with Harley Davidson, working for South Side Choppers. Today's discussion, oil carryover, basically, you have to look at your engine, and divide it into one of two categories. Now basically, all engines have to do what we call, breathe. As the pistons travel up and down inside the cylinders, they're displacing air. The air has to go somewhere, and it's going to carry an oil mist with it. You have crankcase breathers, and you have head breathers. In the early 90's, Harley went to a head breathing design, where the engine actually had two bolts, one here, one here, where the heads, the breathing, actually came out through there, and they had it channeled into the backplate of the air filter, right here. If you get misting, oil misting, or carryover from this area, it's usually because the bolts themselves, or the tubes, or the channeling system, if you've gone to an after market air cleaner, is not fitted correctly, or is not attached correctly, or the tubes themselves had deteriorated, and cracked, and allowed the oil to escape. Crankcase breathers more commonly, initially, were vented right out to the air. EPA came down, put their foot down, and said, We need to run these things to filters, or run them back to catch cans, or so on and so forth, so if you get a crankcase breather that's got too much oil carryover, chances are it's coming out somewhere on the bottom of the bike, and you could put a filter or a catch can on that, to keep that from misting the back tire, which could provide a dangerous scenario, or a lot of other places, will figure out a way you can route them back into the air cleaner, from another point, as we did on this sportster here. This was its original breathing line here, and we routed it up to the back of the air plate. What this does, is it takes the mist, and recirculates it back into the motor, so if you're having any issues with oil carryover, with your Harley Davidson motorcycle. Again remember, it's going to be a model specific problem, and I would recommend consulting your Harley Davidson dealer, or your favorite after market shop, and I'm Jeff Jannett, with South Side Choppers, St. Pete, Florida, Certified Harley Davidson Master Technician. Keep the rubber side down.