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  #1  
Old 3rd November 2019
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Default Cam chest vent hose

There is a braided vent hose going from my cam cover that ends at the back of the motor underneath the starter. It is just an open hose. It is an oily, greasy mess in that whole area of the bike. Is this normal?
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Old 3rd November 2019
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That vent hose should go to the oil tank...

It has the pipe clamp on it in this pic [hard to see]...


It is the bottom one in this pic...


Does not run thru the hole in this pic...
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The hose I'm talking about is the breather hose that starts at the cam cover by the generator. About 10 o'clock on the round part of the cover.
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Quote:
Originally Posted by jsandidge View Post
The hose I'm talking about is the breather hose that starts at the cam cover by the generator. About 10 o'clock on the round part of the cover.
that one was originally plumbed into the carb air cleaner. do you also have the cam chest vent (metal) tube at 6 o'clock? older bikes had only the 0600 vent and it would mist a small amount of oil while riding, but not a major oil slick. another thing you can check is that the end of the generator inside the gear case still has the oil slinger on the end of it.
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yep,normal
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A very good idea is to run two vents, one from the 10:00 o'clock fitment and one from the 6:00 o'clock. On my 1980 I ran the stock type from the 10 to the back of the air cleaner, and a hose from the 6, along the rear muffler support to the back. It would only drip out a few drops when I parked the bike after a "spirited" ride.

The engine obviously ran more freely, a different, better experience.
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Quote:
Originally Posted by doodah man View Post
that one was originally plumbed into the carb air cleaner. do you also have the cam chest vent (metal) tube at 6 o'clock? older bikes had only the 0600 vent and it would mist a small amount of oil while riding, but not a major oil slick. another thing you can check is that the end of the generator inside the gear case still has the oil slinger on the end of it.
There is a plugged hole at 6 o'clock. I think I'll try the double vent like IronMick suggested.
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Be aware that opening the bottom port in the breather on that model defeats the oil_drain_back feature. A hose connected to that position WILL dribble oil needlessly.

If the motor is pushing oil out the breather you have a ring seal problem or the motor is detonating. Adding a second breather hose will not fix that and in this case will let more oil escape.

Braided hose on a Harley sucks because the finish of anything the hose touches will get eaten away at due to vibration. Also broken wires will make you bleed and use bad words.
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Old 4th November 2019
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Quote:
Originally Posted by ryder rick View Post
Be aware that opening the bottom port in the breather on that model defeats the oil_drain_back feature. A hose connected to that position WILL dribble oil needlessly...
I did not experience this with my 1980. Same for at least one other XLForum member.

As I mentioned above, the only dribble I got was minor, and only after the bike was parked after a "spirited" ride.

Last edited by IronMick; 4th November 2019 at 14:29.. Reason: sp
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If/when you have your cam cover off you will see a tiny hole drilled at the bottom of the cavity that by-passes the check valve and drains any oil that collects in the cavity back into the motor.
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