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Enduro Engine 4 stroke (including EFI & Exhaust) 4 stroke engine, EFI, and exhaust discussion


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  #1  
Old 11-13-2009, 10:27 AM
Laurrr Laurrr is offline
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Default 2006 exhaust has a Catalytic converter?

Do the stock gasgas pipes have a Catalytic converter inside?

I think mine has (euro bike). Can I cut the pipe, remove it, TIG weld it back together?
Will it improve torque / HP, do I need a new trim?


Thank you!


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Old 11-13-2009, 06:46 PM
jostby jostby is offline
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Some Euro bikes do but I don't think they made it into the USA. Do a search on this forum for "converter", someone removed the cat and posted pictures of their reweld. Turned out real good.
Seems the cat pipes have a pipe plug or something towards the front of them.
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'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
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Old 11-14-2009, 11:20 AM
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iancp5 iancp5 is offline
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I have an 06. Didn't think it had a cat - this plug pipe what does it look like? I have a little pipe with a bolt in it near the exhaust port end - I assumed that was for putting a CO2 or O2 sensor in for trimming?
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Old 11-14-2009, 11:50 AM
Laurrr Laurrr is offline
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Quote:
Originally Posted by iancp5 View Post
a little pipe with a bolt in it near the exhaust port end
Mine has that plug to...

I think there is a converter in the ?midpipe?. (Pipe above the clutch).. There is a number on that pipe: /3fs06-1 E9
That pipe is a bit wider in the middle..

The search didn't help me..
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Old 11-15-2009, 08:42 AM
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iancp5 iancp5 is offline
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I thought cats needed to be quite big and were pretty obvious on a 4 stroke but I don't really know. On my road bike it has a huge bulge for the cat but then again it's a larger engine.
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Old 11-15-2009, 08:59 AM
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d2w d2w is offline
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My (Canadian) '06 EC300 came with such a pipe in addition to the non-catalytic pipe. As a spare, I modified the cat-pipe as you described; I scored the pipe perpendicular to my cut-line, sawed through the pipe, removed the catalytic canister (about 6cm in diameter and 7cm in height), realigned the pipe pieces using the score-lines, and then welded everything back up. I also removed and plugged the other smaller (5mm) pipe near the exhaust flange mount. Pretty obvious and easy.

The "mistake" I made was that I made my cut too high on the pipe and ended up cutting through the cat-canister; that's hard material and took forever (even with an electric bandsaw! ).

Now after a little work and a splash of paint I have a spare pipe waiting for me in the basement.
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