Question about 2004 Harley Davidson FXST - FXSTI Softail standard
Engine noise and vibration at low rpms on the top end of motor and air bubbles on dip stick
Posted by Anonymous on
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Posted on Jan 02, 2017
Hard to diagnose, but if you have a bad engine vibration, you will be able to diagnose that when stopped and just revving up the engine. Moving balance problem can be easily out of true wheel and or needs balanced. (You can make your own balancer/ wheel true guage our of a couple of 8X8 posts with axle size hole drilled in each one) If you clonked a curb or pot hole at speed this can easily happen. Hope this helps you with your scoot, Rick
Posted on Apr 29, 2009
To begin with, the capacity of your Sporty's oil tank is 3 quarts, not 3 liters. A liter is slighly more than a quart and the oil tank on the bike is designed to hold three quarts of hot oil. Oil expands when it gets hot. If you notice the marks on the dipstick, the lower mark is "full cold" and the upper mark is "full hot". Never overfill a Sporty.
Now, if the bike had been sitting for a while, they have a tendency to "oil sump". Oil sumping is a condition where oil seeps past the check valve in the oil pump and builds up in the bottom of the crankcase. Any Sportster and any Big Twin prior to the Twin Cam that has the oil tank located higher than the engine will do this. That's why the older Harley's would "puke" oil out of the breather when restarted after sitting for a while. If you had a half quart of oil in the bottom end and then poured three quarts into the oil tank, you were overfilled. That's one reason to always start the bike and run it until it's at full operating temperature before you change the oil. The warm oil drains easier and there is none left in the bottom end to play a nasty trick on you. This event happens quite often. You are lucky in the fact that the oil plug didn't blow off while you were riding down the road. When that happens, you get covered in oil. Not something anyone would like.
Good Luck and Ride Safely
Posted on May 31, 2010
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