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  #11  
Old 12th July 2019
72 Ironhead XLH's Avatar
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Why not just seal them and vent from the crankcase?
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  #12  
Old 12th July 2019
mick42 mick42 is offline
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Quote:
Originally Posted by steveolds View Post
@Mick42, did you need or have to remove your umbrella vales when doing this? Over on another forum they are saying to remove the umbrella valves. I see nothing about it doing a Buell/Buell swap.
Took them out when swapping the covers because there was no need to keep them in.

Last edited by mick42; 12th July 2019 at 21:27..
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  #13  
Old 12th July 2019
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Can’t find the pictures that I wanted so I took this today after getting home from a road trip thru Maine.

The two valves are connected to a ‘Y’ connector that is connected to some pvc tubing and that runs along the frame under the tank.



The tube comes down to my catch can that I can empty when it gets too much puk in it. On a long hard ride the catch can will clean its self out.



I then run some tubing from my catch can up under the fender and it exits at the rear of the fender on the left side of the bike. When the bike is on the jiffy stand the hose is way over the side and if some puk drips from the end it’s not near the tire and there is no oily mist spraying over all my shiny bits while I’m riding.


Very clean

And this is my bike next to some cows across the street from its stable. Crap wrong thread.
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  #14  
Old 12th July 2019
mick42 mick42 is offline
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And then I have these sitting in my extra parts bin. They are made by kuryakyn and they route the breathers up over the stock rocker covers and then you can use the same plumbing model as I have. I took these off as soon as I learned about the Buell setup.
https://www.jpcycles.com/product/401...kuni-hsr-carbs





They came with both solid mount and rubber mount head breather bolts and I think they fit under 3.3 and 4.5 gallon tanks.
You can never have enough extra stuff.

Last edited by mick42; 12th July 2019 at 22:29..
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  #15  
Old 12th July 2019
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Ok so the rockers will interchange.
The PCVs are still passing a certain amount of oil mist which gathers in the catch can.
A long hard ride gives higher air pressure which suspends what's in the catch can and sends the mist out the end of the line?


edit:
Any idea what year models of Buell rocker boxes that is?
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Last edited by Hippysmack; 12th July 2019 at 23:26..
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  #16  
Old 12th July 2019
mick42 mick42 is offline
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I have XB rockers on XB heads. Not sure about XB rockers on non-XB heads.
Back to Hammer I guess but he could just use the other breather product to clean up his build and not have to buy XB rockers. They do close to the same thing by moving breather stuff to the top of the heads.

Last edited by mick42; 13th July 2019 at 01:07..
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  #17  
Old 13th July 2019
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OK.
I'm building this page in the Sportsterpedia for using the Buell PCV system.
I've added the pics of yours there.
Looks clean.
I'll wait to hear for sure if they interchange before adding that fact.
http://sportsterpedia.com/doku.php/techtalk:refil05b
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  #18  
Old 13th July 2019
Randy_rots Randy_rots is offline
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All of them are interchangeable (I mean they will fit). You just can't put XB or 04 up cover on pre 2003 bikes only because there's not enough space between the frame and cover on rear piece.
But if engine is out, it's no problem to fit them. Early 1986 till 1991 I think does not have breather holes, so they won't work on 1991 up models properly.
I have XR1200 heads on my XB 2008 and XB rocker boxes, no problem at all. I only had to plug breather holes.
Also not this topic but you can put XL rocker boxes on Evo BT I have done this once or twice in the past.
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  #19  
Old 13th July 2019
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Thanks.
86-90 had the breather in the cam box.
One question come to mind is if the 91-03 rocker box assembly would fit on 04 Up and Up models.
They look like they would in pics I've seen.
The catch would seem to be if the different boxes are the same height.
So likewise, I was wondering if the XB rocker box would also fit 91 Up.
But removing the engine from the frame to install the Buell box doesn't sound promising in the long run.
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  #20  
Old 13th July 2019
Randy_rots Randy_rots is offline
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Quote:
Originally Posted by Hippysmack View Post
Thanks.
86-90 had the breather in the cam box.
One question come to mind is if the 91-03 rocker box assembly would fit on 04 Up and Up models.
They look like they would in pics I've seen.
The catch would seem to be if the different boxes are the same height.
So likewise, I was wondering if the XB rocker box would also fit 91 Up.
But removing the engine from the frame to install the Buell box doesn't sound promising in the long run.
The heights are pretty close but pre 2003 rocker boxes are 3 pieces, that's why you can install them in that tight space. XBs and 04 up XLs have 2 pieces rocker boxes and tall covers that won't go between the frame and rocker box base on the rear piece. I was looking into that and It would work but to remove engine from the frame to do that?? Hell no
Jorgen modified his ridged mount frame to get rid of that problem with his taller S&S engine and that looked promising for stock 2003 and XB rocker boxes but I have never asked him to take the measurements. He is a busy man and gets loads of questions from xlforum members on a daily bases, so I figured out I will leave him alone. Maybe he will come forward and do this for us .
But frame mods are not that easy and safe, so I would not recommend it.
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