Question about 1993 Harley Davidson FLSTF Fat boy
TOO much oil likely, run at halfway between ADD and FULL and check it HOT
Posted on Oct 18, 2014
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Posted on Jan 02, 2017
Just a possibility, i found this worked on some cars with similar problem (at least reduced the amount of oil going up the pipe)
Add a (bit at a time) bottle of STP oil treatment, the thick gooey stuff, it should increase the surface tension of the oil, keeping it in one piece, not splitting up and splattering around --> thus being less readily exhaled up the blow-off pipe.
just a thought. this will also increase the compression a little since it thickens the oil, will take up a little wear too coz it likes to cling on to bearings.
Posted on Apr 30, 2009
if you have oil and smoke coming out of the breather on any engine it is a good indication that the piston/piston rings or valves are damaged,what is happening is the fuel oil,smoke is bypassing the piston or valves and coming out through the breather,i would seriously look atgetting it sorted before any more damage occurs,sorry but it doesnt sound cheap,hope this helps
Posted on Jul 06, 2009
Replace the petcock. The rubber diaphragm is ruptured. I'd also bet your fuel mileage dropped cause the ruptured diaphragm is allowing raw fuel to be sucked into the intake manifold.
Posted on Jul 23, 2009
you put to much oil in. drain some off. some oil in recirculated through breather hose's going to the air filter. If u over fill more goes in then can be handled and it drips out of airfilter and onto bike. dont put in a full 3 qts just 2.6
Posted on Oct 06, 2009
It sounds like you have a condition we call "oil sumping". This is common on Softails and the old Shovelhead bikes. What is happening is when the bike is allowed to sit up for an extended period of time, the oil in the tank seeps past the check valve in the engines oil pump and collects in the engine cases. When the engine is started, the crankcase pressure blows the excess oil out of the vent which is in the air cleaner. The reason it does this is because the oil tank is higher than the engine. I thought Harley would have figured out a way to prevent this from happening in the new Twin Cam engines but I suppose they didn't.
Now, on the older Evo engines, you could reface the seat in the oil pump and stop this most of the time, but I don't know how to stop it on a Twin Cam since they've got a completely different oil pump.
On an Evo, there is another thing that would cause this as well. If you had something come through the oil pump and it locked the scavenge gears up and sheared the drive key, all the oil in the tank would be in the engine. This would cause oil to blow out of the air cleaner as well.
Check the level of the oil in your oil tank. The stick has two marks on it. The top mark is "FULL HOT" and the lower mark is "FULL COLD". Do not overfill your oil tank.
Posted on Jul 27, 2010
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