I agree Kaua and stated in the first post up there concerning this that many folks are running engine oils in the primary. I had to do that once several years ago on a long trip when I had a bad leak on the inspection cover gasket of an EVO. I was like...bleeding a quart every couple-hundred miles and got down to filling it with the cheapest oil I could find at convenience stores until I got to a stealership to get a new gasket. Many folks already use a good grade of motor oil (less friction inhibitors) and ATF as well in the primary. I haven't ran the MOCO fluids in my primaries for years now.

Consider this though....that stuff you find in your catch-can, or dripping from the filter....came out of your motor. So...that's what you have lubricating your engine. It's oil vapor and lots of parts within that engine are lubricated with this very same oil vapor.

 

Here's my question. The blow by with the TBW has been around since 08 and with all the non EPA stuff thats on the market why has no one just made a new back plate so we can vent outside the throttle body with out us drilling tapping plugging etc?

 

For you guys running the vent tube down to the lower frame tube, are you getting any sticky film on the drive belt, rear wheel/hub, brake disc or on the tire? The vapor, occasional drip and whatever else comes out won't have the mass to drop straight down with 70 mph wind going straight back toward all the stuff mounted to the swing arm. A catch can or the factory set up seem to be the only sensible options to me. Having a fine oil spray blowing back on everything just seems to re-locate the clean up area.

 

Your Avatar Rocks!

 

I thought I would post this for others incase they want to mod their 08 and up. I did this on my 2012 Ultra.

List of items.

2 barbed hose fittings, 1/4 inch ID with 1/8 Pipe threaded end
1- 1/8 Pipe tap
3 ft of 1/4 inch ID fuel line
1 T fitting 1/4 inch ID
I package of Q-Bond to fill breather holes in backing plate
New backing plate gasket and orings

Pretty simple job, Mark the backing plate with a sharpie to get your holes lined up so when you take it off you have an idea where to drill them

I lined mine up with the internal breather holes in the backing plate so that they are right where the breather holes are in the breather bolts.

Did a center punch and drilled a 1/8 hole then a 5/16 inch hole.

Took my time and tapped with the 1/8th pipe tap.

Cleaned everything up with brake cleaner

Applied Q-Bond from the Auto store combined with the aluminum powder which makes a permenant welde without welding

Put everything together, routed my hoses and presto done in less than 2 hrs taking my sweet time.

Any questions just ask

 

OK, so you have a filter and a hose system which does not involve intake vacume so the filter would never get soaked with oil and not need a drain line?

 

I would like to ask a question to those of you that have been experimenting with an alternative drain line. I read where most come off a T fitting and run a single hose through the heads behind the shift linkage and zip tie it along the frame rail either under the primary or all the way back past the belt. I see another route that looks better to me and wonder if anyone has already tried it. If you come off the T fitting and run it behind the exhaust header pipe you can then run it just behind the oil fill cap and zip tie to some other small hoses that point straight to the ground. One of those small hoses is some type of drain hose because it is open on the end. I'm a solo rider and had already removed my passenger floor boards which kind of made this open area with the small hoses more visible. Unless I'm missing something it looks like an ideal spot for the breather hose. Using a soft tape measure it looks like 3 ft of 3/8 hose will be more than enough. Any thoughts and comments are appreciated. Thanks.

 

It's like the Simon and Garfunkel song....."50-Ways To Leave Your Lover".

Seriously though....it's a shame we even have to fool with it and there seems to be no rhyme-or-reason in most cases. I've seen them do nothing at all and then we have those that throw-up all over the place. Get rid of it the best way you can and as long as you have a breather system that "breaths", sitck it in a place where it doesn't vent on the passenger or the bike. I've owned 15 versions of both the EVO and the TC. Some were much worse than others no matter what head-mods, the oil level, or anyones kit I installed. BTW....this is not something isolated to Harley. Some metric examples have similar issues.

 

A member of this forum did a mod similar to Dawg with barbed 1/4" fittings which I am seriously considering:

https://www.hdforums.com/forum/touri...estions-2.html

The question I have for a mod like this is, for a 1/4-18 fitting the tap/die chart shows a 7/16 hole before you tap the hole....is this correct?