Oil blowing out air breather on 883 sportster and smoking tailpipe

SOURCE: Oil in air filter

Check all your vacuum lines for kinks and/or blockage. Most of the bikes I've had this problem with are due to a blocked vacuum line.

SOURCE: 1999 sportster lost power

it might be excessive piston slap,=pistons too loose in bore so loosing compresion.ignition timing too advanced so pinking.carberation too weak,

SOURCE: I have a 1999 sportster 883 it's leaks oil out

Sounds like you're overfilling the oil tank. Always check the oil with the bike on the stand. There are two marks on the oil dipstick. The upper mark is "FULL HOT" and the lower mark is "FULL COLD". Keep the oil level between the two marks and never "top off" the tank when the engine and oil is cold. As long as you see oil on the dipstick, ride the bike until the engine is at full operating temp and the only add oil if it is below the lower mark. Never fill it to the top mark. Your Sportster holds three quarts of oil that is pumped into the engine and then back out. The 1983-1985 XR1000 Sportsters, the hot rod Harleys as they were called, on held two quarts of oil. I've seen hill climbers that had custom oil tanks on them that only held a pint of oil. As long as you can see oil on that dipstick, you have enough oil. If you're getting so much crankcase blow by that your blowing oil out of the tank breather tube, you need to run a compression or leak down test on the engine to check for ring wear. Also, I've seen bikes do that when the needle and seat in the carb was bad or the accelerator pump diaphragm bad. Smell of the oil. Does it smell like gasoline? If so, you have carburetor problems and gasoline is running into your engine diluting the oil and adding volume to it.

Good Luck
Steve

SOURCE: I have 1986 evo 883

Even though the oil had been drained, this will still happen. The reason is that the oil still left in the engine has had time to run down and puddle in the crankcase. When the engine is restarted, the oil pump cannot pump the oil out of the crankcase fast enough to prevent it from being blown out of the crankcase vent hose. Since the EPA requires that the air from the crankcase vent be "recycled" through the engine and burned, the excess oil is blown into the air filter through the crankcase vent hose. Once the engine is run long enough to clear the excess oil out, it should return to normal. It will clear itself out due to the fact that the scavenger gears in the pump are larger than the feed gears. It pumps out more oil than it pumps in with each revolution of the engine.

Good Luck
steve

Testimonial: "Thanks for the feed back,I kind of come to that idea after some contemplation, it confirms!.I initially though I put to much oil, or blocked line, "