Harley Touring external breather mod on Screamin' Eagle Ventilator 

A 12 point 1/4" inch drive socket of the right size fits the tap and works better than rotating vise grip.

don't complain about it being a pain you did it with out a vice and much experience , good job .

I appreciate your video. It’s more specific to the needs of my street glide special with the screaming eagle air cleaner on it. I’ll be looking at your other videos for advice. Thanks again.

Very well explained. I like that you listed all the parts used. Many youtubers don't do that. I think the clamps you used would work also well for other hoses on the Harley Engine. They look very well made and will not dig into rubber hoses or come loose.

Looks good. I did the same on my FLHTK but chose to go forward to a catch can instead of back. I used stainless rubber lined loom clamps attached to the front cylinder lifter cover to keep the hose from touching any part of the engine or exhaust, then routed the hose down over the back of the rear brake master cylinder (slight pain to route the hose) so that I could mount the DK catch can off of the back bolt of the rear brake master cylinder. I replaced the rear bolt with a 1 1/2 inch bolt, used a 1/2" steel spacer and another loom clamp to hang the catch can off set from touching any part of the bike. Used a dremel to clean up the loom clamps and shape them to fit nicely on the lifter cover so that there will be no scratching of the chrome.

As you said, the NPT (National Pipe Thread tap) is tapered, it is not meant to be tapped into the material all the way in, but rather in enough to allow for the treaded fitting you plan to install. I have an Arlen Ness Big Sucker air cleaner assembly on my 2012 StreetGlide, and I did a very similar mod. to my Bike. I used fuel line hose, black ty-raps and routed the drain line fwd and down behind my fwd motor mount. I also ty-rapped a piece of cloth on the end of the tube (instead of a filter or catch can). It works great and almost invisible. I check everything including the air filter at each oil change. So far so good.

Great vid. One small suggestion: when you were screwing in the brass fittings, a set of ratcheting wrenches would have made that a snap vs. an open box wrench.

I did a similar mod and used a DK Customs catch can. Lots of water moisture along with oil mist!! So glad I did it on my ‘21 Ultra-Limited.

NPT is a tapered thread. Starts small gets bigger. That's why it gets tighter. Turned out great. Nice job

I like your style and funny the Exxon Valdez pun 😂

Nicely done! Thank you for the video.

2 tips Sir. 1: don't use carbon steel taps, a few dollars more for a H.S.S. or high speed steel tap, and you have one that will last much longer and perform better. 2 : for the record, tap and machine cast iron - dry. Do not use a lubricant or cutting oil on cast iron. This in response to your statement in the video about tapping metals. For those concerned about the silicone, if you are able to tap the holes, use what's called a grub screw or socket head set screw. I believe they're a 10- 24 or 10- 32 thread. Apologies I'm not in the shop right now to be specific. I hope this helps 🙏

Nice vid, been curious about this mod on my 21 bob with the 114, but as far as using grips, Amazon sells special sockets just for the tap. Plus you can also slide some stainless steel hose rap so the exhaust doesn't melt the hose.

I did something similar but had a machinist do it. I had them weld up the oil channels to the intake so I don’t have to worry about anything being sucked in through those. It’s a K&N back plate.

Looks great nice clean job well donr

The tap got harder because npt is tapered

yeah definitely do a catch can.. oil dripping in front of rear wheel .. not such a good idea. no matter how little it is.. ;)

for a cleaner and safer look ,route hose between cylinders and straight down between motor case and transmission and secure on frame also install a small uni filter on end of hose instead of catch can

Great work and great solution.

Hi great material very nice mounted ;)

Next time you use an npt tap go out and buy a npt reamer. After drilling the hole to size ream it with the tapered npt reamer. This will give the hole the correct tapered shape and will allow you to hand tap with ease.

Nice video, look into a set of "tap sockets" they are made for this type of application.

Old video, but a socket fits over the square tap end

I routed the hose between the cylinder heads back the other way away from the exhaust.

Looks good, I would use a catch can though. The O2 sensors get pretty hot

I have a 14 sgs . with Arlen Ness big sucker. Never had oil issues. But I also have 2020 lrs with s s intake...now I have oil blow by issue. About to get vented dipstick.

Added catch can to your exact breather. Tried to let the catch can hang under breather but it wound up scuffing the powder coat on my case. Rerouted it down and behind my voltage regulator. I have more water in my can than oil. Good bit of water vapor til engine gets hot.

What brand air filter is that ? Good lookin air cleaner . I did a external breather on my trike and routed the line on right front side of the frame away from the exhaust using a catch can. Great video !

I really need to do this on my 2016 Softail Slim S but I’m INSANELY INTIMIDATED by the drilling & tapping process!😬😬 You made it look very easy, has there been any issues after using the bike?

You answered your own question its a tapered tap ie gets larger the deepen it goes

You can use a 12 point socket on that tap.

They make long shank taps, might be worth the investment.

The Vice grip method is also what I came to as well. The Loctite was a nice insurance tip. I made my own catch can from a billet fuel filter I modified. Now I don’t have to make this video.

Bring that hose in between the V and out the other side. And hose and barbs don’t need to be that big. Smaller hoses work better.

It's a pipe tap. It will get harder as you go deeper.

Use a t handle for the tap.

tap socket.... it is an adapter that you use with a ratchet.

You should have used Chrome hose that you could tuck

Did u use the correct tap drill size

What size brass fittings were they ?

Dk customs has a nice breather kit I like the charcoal pearl color I got the same

Did this and oil sprayed all over the back tire don’t understand why so much oil coming out redid the rocker

Here is what I don't get. If you can ventilate pressure at the top of the case, why not just do that and plug the vent holes on the bolt???? I'm so misinformed by what the appropriate ventilation method is.

I put the tap in my drill and just go real slow with the variable speed trigger! I’ve done this for years at work and it works well! Also,, i use a wax stick to keep the threads lubed! Just be careful to not go fast or the tap will break!

It gets tighter because of the taper.

Use a cresent wrench.

I have 60k miles no issues

Dk customs makes a transformer plate done in minutes....

A good bit of oil means you have too much oil in the bike.

Is it catching anything?

Yep,good mod. Only problem could be breaks the laws on emissions in some countries.

Instead of squeezing silicone into the passages tap the holes same as you did holes you drilled and put in screws or headless Allen screws with lock tight

Why would you not just replace bolt with no holes. So oil stays in engine. And not exit anything