What's wrong with installing a 3/16 Y fitting between the head breathers and then down to the ground on my 15 tri-glide ? Had my air filter off and alot of crap in there. Every other bike i've had i rerouted the breather to the ground, Just kinda lax doing this one. They did make it was on this one.

The other part of this question involves on what to use to clean the throttle body out. Just some carb and throttle body spray ? Maybe something better ? I thunk i'll look for some Techron rated cleaner.

 

No comment on venting the heads as you suggest , but a good spray of carb cleaner or PJ1 Parts cleaner should clean out the crap inside the air box.
Just installed a K&N filter in my stock airbox and used a carb cleaner and a paper towel to wipe up any mess.
Rob

 

Make sure a breather hose is not pinched. Don't ask me how I know.

 

The only thing i'm changing is the T- fitting to a Y- fitting and then drilling a hole and running the line outside the air box to the ground. Don't see why the Y- fitting would make any differance at all as far as air flow coming out of the breathers.
My air box is clean, it's the throttle body intake that has some crud in it. I guess i will just use throttle body cleaner and spray while running at high idle. Really the air filter had very little oil on it.

 

Should work just fine. No pics, but I ran a rubber hose from my two crankcase breather bolts to a y fitting and then to a catch tank. Works great. That crud in there is the oil mist/vapor that gets routed back down the throat of the throttle body. Its an EPA thing. Designed to be sucked into cylinders and burnt. If you dont add a fuel management system and let it run hot as hell like it does when it comes from the factory, it probably does burn it, but if you add a tuner and increase fuel mixture, that cools down the engine, which does not burn the oil mist very efficiently. That leaves a lot of crap in your throttle body and soot buildup on top of your pistons.

 

 

I have little different setup than what you guys are describing, and I drilled/tapped hollow backplate legs and installed hose barb fittings and ran 2 pieces fuel line (no "Y" or "T") both down side of motor to just below frame, and plugged breather passages to mouth of throttle body with silicone. Didn't bother with filter, catch can, or anything on breather lines--I did drill out low side holes to 1/8" under breather filters in rocker boxes when I had motor apart--but I get very little vapor and maybe just an occasional quarter size spot under bike where I park. In a garage I might give it a wipe but it's barely noticeable, and feels kinda old school which is alright with me.

 

You must of found out what I found out! LOL

Bruce

 

https://www.hdforums.com/forum/touring-models/1004374-finally-did-my-breather-bypass-pics-included.html
all the different mods together

 

Cleaned the air filter and rerouted my breather today and i must say not much air comes out of these new twin cam bikes. My evo had much more coming out. I think the hose is only something like 16 inchs long. Will see if i getany drops of oil on the ground like my shovel and evo had. Pan always had oil under it. No matter what it has to be better than letting all that crap build up in the engine.