Inside the 390 Zorst - KTM Duke 390 Forum
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post #1 of 54 Old 03-03-2014, 05:01 AM Thread Starter
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Inside the 390 Zorst

Anyone been wondering what it actually looks like? Well wonder no more! Thanks to one of the lads on the Aussie FB Duke 200/390 page he decided to not let a brand new bike hold him back.
If you look at the pics and the self study guide SM posted http://www.ktmduke390forum.com/forum...dy-manual.html
you can see that he basically shortened the system instead of running back up and down the pipe before exit. The final pic shows the bottom pipe where he cut the corner and top out so it exits faster. He also pulled the snorkel off the airbox, unsure of the improvements. Its been said that its flowing easliy but im unsure if any HP has been lost or gained as ther has been no dyno work done.







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post #2 of 54 Old 03-03-2014, 01:03 PM
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interesting

thanks for taking the time to post up the photos.
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post #3 of 54 Old 03-04-2014, 12:35 AM
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It's a tune length exhaust. Those mods are just going to wreck it I suspect.
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post #4 of 54 Old 03-04-2014, 03:39 PM
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nice to see this, not something everyone will see themselves, some just wont want to go to this length
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post #5 of 54 Old 03-04-2014, 04:50 PM
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So what is the point of this mod? What is it going to do for the bike?

I am also skeptical that it could have negative consequences for the bike. A decrease in horsepower would suck.
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post #6 of 54 Old 03-04-2014, 05:31 PM
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Just look at all those chambers

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post #7 of 54 Old 03-05-2014, 03:04 PM
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Quote:
Originally Posted by Heizenberg View Post
So what is the point of this mod? What is it going to do for the bike?
Probably just to make it louder and a bit lighter.

As AOD points out, it's tinkering with the tuned length of the exhaust. And while that may not cause too much of a problem, it certainly won't be doing much good.

That said, removing the mesh walled chamber (presumably the cat), might actually help gas flow a bit. Not so you'd really notice though.

bm
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post #8 of 54 Old 03-05-2014, 03:13 PM Thread Starter
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It was done for noise and because he could I guess but I would really like to see dyno results so I could understand if there was a gain or loss.
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post #9 of 54 Old 03-05-2014, 06:36 PM
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Originally Posted by Dan1 View Post
It was done for noise and because he could I guess but I would really like to see dyno results so I could understand if there was a gain or loss.
Also in for Dyno results, it always helps to have information like that available.
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post #10 of 54 Old 03-05-2014, 08:25 PM
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Originally Posted by HazardousDuke View Post
Also in for Dyno results, it always helps to have information like that available.
You hardly need Dyno results to work out what will happen.
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