dk customs breather bolts
Thread Starter
|
Cruiser
Joined: Sep 2013
Posts: 171
Likes: 9
From: South Texas
dk customs breather bolts
I just installed them on my street Bob and they push out a lot of dirty air. It looked like two little locomotives pushing out smoke. Is that normal? Was the engine too hot? I have the oil sitting at the top of full.
I just cannot see sitting at a stop light breathing that in. Anyone with experience or knowledge about this please let me know what is normal for this system.
I just cannot see sitting at a stop light breathing that in. Anyone with experience or knowledge about this please let me know what is normal for this system.
Seasoned HDF Member
Joined: May 2014
Posts: 15,459
Likes: 14,352
From: Illinois
I have been looking into this issue a lot. It seems you got three choices:
1. Stick with the vent tubes that run the oil mist into the combustion chamber.
2. Use breather bolts (like DK Customs sells) and vent the oil mist out.
3. Run hoses/lines to a collector can.
Seems like #3 is the best way to go.
1. Stick with the vent tubes that run the oil mist into the combustion chamber.
2. Use breather bolts (like DK Customs sells) and vent the oil mist out.
3. Run hoses/lines to a collector can.
Seems like #3 is the best way to go.
Thread Starter
|
Cruiser
Joined: Sep 2013
Posts: 171
Likes: 9
From: South Texas
Thank you all for the replies. I will have to look into why it was happening. Fixing that seems better than switching to the catch can.
Thanks again. I have to get back to the garage.
Take care
Thanks again. I have to get back to the garage.
Take care
Trending Topics
Ultimate HDF Member
Joined: Apr 2008
Posts: 5,384
Likes: 12
From: Out on Deranged
Did you mean the oil is at the full mark when hot or cold? If it's at full cold then you have a little too much. Let it go down some and see if the mist and goo disappear. I keep my oil at the halfway mark when cold and it doesn't budge till next oil change. When I used to fill it to the full mark I had to keep adding to keep it there, then it dawned on me~fill it less! If the problem persists it may mean that the drainage holes in your heads are clogged or simply not drilled out big enough.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,525
Likes: 6,406
From: Honah Lee
Not sure what hole you are talking about drilling bigger but do not drill the bottom of the baffle plate with the one way out popet (butterfly) valve. It appears small but just a little oil gets in there and drains out. If you drill it bigger, it will actually allow more blow-by from the crankcase coming up through the pushrod tubes at a higher rate. The other drain hole is fairly large . I know there was a post on here a while back about the design and how the screens should be positioned to catch oil. If your motor is fairly new, it could still have more blow-by then it will have after a few 1000 miles. Remember, you will see lot less oil in filter if you drive regularly since if it sets weeks, the oil will drain down that is in plumbing. Also 70+ driving and you are going to have some on the outside with an open SE heavy breather or open breather bolts. As long as the oil level it not above full when hot, it's not too full. The oil pump pulls the oil into the motor, not gravity. However a Softail will drain a little in setting for a while but the larger return side of the pump gets rid of it in seconds.
Last edited by Jackie Paper; Mar 17, 2015 at 04:12 PM.
Ultimate HDF Member
Joined: Apr 2008
Posts: 5,384
Likes: 12
From: Out on Deranged
The hole is the drain back hole (one in each head), the heads would need to come off for that job and i think the spec calls for no more than 3/32ths but don't quote me on that because I did the job with a friend back at the beginning of '13. It depends how you ride and how much oil you keep in the pan. Like I said I used to have alot more blow by when I would keep the oil topped to full. Besides the bikes are all the same and yet all different to some degree. what works for one guy may not for the next. OP's may be clogged who knows? Alot of new guys post questions and offer no info such as what year / mileage, did he buy it used, any motorwork, if the bike was sitting in some garage for years and so on.