AboutMike Wells Expertise PLEASE READ BEFORE ASKING A QUESTION!!! I CAN ONLY ANSWER QUESTIONS ABOUT HARLEYS !!! I DONT KNOW ANYTHING ABOUT OTHER MODELS!!! I have a Harley only shop with 30 years experience located in Ohio. We specialize in complete and total repair, restoration, hi-performance, and custom bike building. I can work on Flat Heads to Twin Cams.
Experience Engine rebuilding (can be shipped),
Trans rebuilding (can be shipped),
Restoration,
Custom bike building
Expert: Mike Wells Date: 7/20/2008 Subject: Crankcase Breather tube
Question Hi Mike, I have a 73 XLCH iron head with only 14,000 miles on it.About 7 years ago(4000 miles ago)I redid the top end of the engine(pistons,rings,jugs.020 over,heads redone with bronze guides) I just recently had the heads off again to reseal some stubborn oil leaks at the rocker covers and shafts.After a 5 mile road test the bike ran good,but I noticed as it was sitting on the side stand before shutting it down,an oil mist was coming from the hreather tube.Whne I felt it,I could also feel what seemed to be compression pulses from the tube.My question is should there be ANY pressure coming from that tube? I never felt there before and only did because I saw the oil mist. Is this excessive blowby requiring rings/cylinder measuring,etc.?
Answer You will have pressure coming out of that tube, that is how the bottom end vents. With the age of your bike you will have a slight amount of oil mist going with the air. Your oil pump might be getting old and the return side isnot pumping fast enough
Good luck and happy riding
Mike
