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MarkT Exhaust
Valkyrie Riders Cruiser Club > General > 1500 Tech Board > Desmog ports - positive or vacuum pressure?
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Author Topic: Desmog ports - positive or vacuum pressure?  (Read 1413 times)
Black Sled
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Posts: 68
« on: August 24, 2009, 03:23:22 PM »
Does anyone know what the effect is of inadequately sealed desmog ports?  Do they run vacuum or positive pressure? 

I just cut the tubes off the orginal chrome plugs and filled them with JB Weld.  They are held in place with the original fasteners.  Wasn't sure if these needed to be sealed up air tight or what...
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Black 2000 Valk Tourer (my black sled)
Dave Weaver
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Posts: 477


Seymour, IN
« Reply #1 on: August 24, 2009, 03:27:14 PM »
That is the same remedy I performed, and haven't had any trouble in 2 years.
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Do unto others as you would have them do unto you.
Tropic traveler
Member
*****
Posts: 3117


Livin' the Valk, er, F6B life in Central Florida.

Silver Springs, Florida
« Reply #2 on: August 24, 2009, 08:57:50 PM »
Exhaust is what you are capping off. So positive pressure is what you are up against.
I drove a 14mm freeze plug down the 4 top holes & chopped the bottom tube off about 1" away from the "foot" then folded it over & welded it shut. Did both Valks that way.
No problemos!


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'13 F6B black-the real new Valkyrie Tourer
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'97 Valkyrie Tourer r&w, OLDFRT's ride now!
'98 Valkyrie Tourer burgundy & cream traded for Kim's F6B
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Youngsmoke
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Posts: 33


Las Vegas, NV
« Reply #3 on: August 25, 2009, 10:52:51 PM »
Hey,
  I decided to clean my carbs because I have lost some power and thought that mught be the culprit.  When I got the carbs off the bike it ocured to me that this would be the perfect time to desmog my bike.  I found the instructions in shop talk but can't seem to find the freeze plugs that everyone recommends using.  I had heard that they have them at NAPA but when I called today they said all they have is 14.4 mm plugs and they are out of stock.  Are these the same?  if not does anyone know where I can get these freeze plugs?  I need help soon because I have a bike trip planned for laborday weekend, and need to get the bike back together in time.
thanks
Ari
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Rocketman
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Posts: 2356

Seabrook, Texas
« Reply #4 on: August 26, 2009, 08:38:16 AM »
Quote from: Youngsmoke on August 25, 2009, 10:52:51 PM
they said all they have is 14.4 mm plugs and they are out of stock.  Are these the same?  if not does anyone know where I can get these freeze plugs?
I don't know from personal experience how tight the fit is, but 0.4 mm is a VERY small amount.  I'd be surprised if that's a problem.
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