• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

250-500cc Modifying Emission Version Expansion Chamber as a Spare

icebergstu

icebergstu

Husqvarna
AA Class
When I bought my 2011 WR300 it came with 2 Expansion Chambers.

The non emission control expansion chamber has no distinguishing features and looks normal.

The Emission Control Expansion Chamber has what looks like a catalytic converter where it mounts to the barrel and has clearly been extended (with a weld) by probably 30mm.
- It is fatter
- The silencer fitting end is different and does not have a stopper welded on it.
- Has a small diameter Tube coming up from the inside pointing towards the handle bars (bleed tube for charcoal canister???)
- Has 3 spring locating rings whereas non emission only has 2
- Is Physically larger and heavier
Has anyone removed the Catalytic Converter honeycomb, cut and welded the small bleed pipe, modified the silencer end and used it as a spare expansion chamber.

By the looks of it, re-jetting may be needed too as the mid section is fatter and the outlet curve is longer.

Please discuss...

20140702_221900_zpshilxshy2.jpg


20140702_221950_zpsfdxtc5wk.jpg


20140702_222222_zps4wtiqacn.jpg


20140702_221932_zpshn7ud348.jpg


Stu
 
icebergstu said:
When I bought my 2011 WR300 it came with 2 Expansion Chambers.

The non emission control expansion chamber has no distinguishing features and looks normal.

The Emission Control Expansion Chamber has what looks like a catalytic converter where it mounts to the barrel and has clearly been extended (with a weld) by probably 30mm.
- It is fatter
- The silencer fitting end is different and does not have a stopper welded on it.
- Has a small diameter Tube coming up from the inside pointing towards the handle bars (bleed tube for charcoal canister???)
- Has 3 spring locating rings whereas non emission only has 2
- Is Physically larger and heavier
Has anyone removed the Catalytic Converter honeycomb, cut and welded the small bleed pipe, modified the silencer end and used it as a spare expansion chamber.

By the looks of it, re-jetting may be needed too as the mid section is fatter and the outlet curve is longer.

Please discuss...

20140702_221900_zpshilxshy2.jpg


20140702_221950_zpsfdxtc5wk.jpg


20140702_222222_zps4wtiqacn.jpg


20140702_221932_zpshn7ud348.jpg


Stu
Click to expand...

Howdy, I recently cut one of these up. There is another larger diffuser tacked inside the main belly of the pipe. Thats the extra weight. Also a restrictor
washer welded to the inside end of the stinger, 10-12 mm dia.
Cheers
 
I did it on mine, its a WR250 -07 but looks very similar.
It had two catalytic converters, one on each side of the air inlet (small tube) and there was a washer welded at the end of last cone. I did not do the work myself, a friend who is a good TIG welder did it for me.
I cant really say if there was any difference in performance, I could not test the pipes back to back because my racing pipe was thrashed.. but I did not change jetting
 
gday Stu,

I have had it done and I have just fitted after it was getting a bit tricky to bend my original into a shape that fit. Cost me $50 and I got another pipe repaired at the same time for the same price.

He is just out of Sydney so probably a bit far for you but your should be able to find someone down there that can do it for you. Let me know if you want his number.

Stu
 
throw it in recycling bin Stu. that piece of junk cost me a ride a while back. got cat conv out with much bashing & cursing, had hole welded up, managed to get it to mount up(nightmare & more bashing/cursing again), loaded bike up, drove to area was gonna ride, started it up & it ran like a piece of poo! didn't realise about the stinger end washer restrictor. went home, took pipe off bike, bashed it senseless with a hammer, threw in bin & drank beer:cheers: wasted hours on that fricken pipe!:banghead: not sure what youd use it for as it makes bike downright dangerous to ride, has all the acceleration & power of a lawnmower
 
did this back in the day when the dealer gave me a couple for nix when waiting for a gnarly. Seemed like such a waste tossing them in the steel bin on delivery. FYI the washer in the stinger made the biggest impact on performance, minor difference from the honeycomb staying in there.
 
My actual pipe was modified by the previous owner and I plan to do the same with my other new restricted pipe, they are no strong pipes but having one it worth the welding I think.


Regards.
 
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