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Old 12-05-2012, 12:06 PM   #1
bisbonian OP
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'99 KTM 640A - replacement mid-pipe?

I've got a '99 KTM 640 Adventure.

The stock mid pipe with the big muffler looking thing is on it right now.

Is there anyone who is still making the replacement, straight-thru, mid-pipe?
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Old 12-05-2012, 06:04 PM   #2
Ol'Muley
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Pipe

Have you checked @ factory early 2000s sm or sc should have mid pipe call Chip Munn @ munnracing .com
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Old 12-05-2012, 06:07 PM   #3
juames
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From what I'm told the pre-silencer doesn't affect air flow, so leave it on...unless you are trying to save a few ounces of weight.
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Old 12-05-2012, 07:33 PM   #4
bmwktmbill
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Bisbo,
Had the replacement on my '02 640a for years.
It smoothed out the power and a seemed to have a few fewer vibes.
Coupled with the Comp muffler the BST40 pulls flawlessly from Zed to redline.

And runs great above the treeline.

It's how it wants to be.
bill
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Old 12-06-2012, 12:15 PM   #5
bisbonian OP
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Quote:
Originally Posted by Ol'Muley View Post
Have you checked @ factory early 2000s sm or sc should have mid pipe call Chip Munn @ munnracing .com
I just placed an order with Chip for some parts yesterday, didn't even think about asking at the time but I'll give him a call.

Quote:
Originally Posted by juames View Post
From what I'm told the pre-silencer doesn't affect air flow, so leave it on...unless you are trying to save a few ounces of weight.
I've been speaking with Derek at Motolab, he's done a lot of dyno work with different configurations on the 640 and suggested the non-mufflerized pipe. It's not so much about power but instead is about heat management.

Quote:
Originally Posted by bmwktmbill View Post
Bisbo,
Had the replacement on my '02 640a for years.
It smoothed out the power and a seemed to have a few fewer vibes.
Coupled with the Comp muffler the BST40 pulls flawlessly from Zed to redline.

And runs great above the treeline.

It's how it wants to be.
bill
Any idea if theses are still available anywhere Bill?
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Old 12-06-2012, 07:52 PM   #6
bmwktmbill
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Bis,
The replacement part number is:
583 051 754 00

Here's a picture...



Gotta be one somewhere, did you try Euro Ebays?

or...

http://www.ktmpartspitstop.com/pages...90010/11090023

And

http://www.ktmpartspitstop.com/pages...010%2F11090023

BTW your existing bolts and springs will work with the replacement pipe.

bill
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'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley

bmwktmbill screwed with this post 12-06-2012 at 07:59 PM
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Old 12-06-2012, 08:08 PM   #7
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Great thread! Also my favorite view.

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Old 12-07-2012, 11:16 AM   #8
bisbonian OP
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Quote:
Originally Posted by bmwktmbill View Post
Bis,
The replacement part number is:
583 051 754 00

Here's a picture...



Gotta be one somewhere, did you try Euro Ebays?

or...

http://www.ktmpartspitstop.com/pages...90010/11090023

And

http://www.ktmpartspitstop.com/pages...010%2F11090023

BTW your existing bolts and springs will work with the replacement pipe.

bill
Thanks for that Bill.

I've been looking through the parts diagrams at Munn Racinig but could not find the pipe itself.

It'll be much easier now.
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Old 12-07-2012, 01:05 PM   #9
Baja Dad
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Young gun made a replacment pipe for that bike.
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Old 12-07-2012, 08:46 PM   #10
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Quote:
Originally Posted by juames View Post
From what I'm told the pre-silencer doesn't affect air flow,
Testing on the flow bench reveals that it does.

Regards,

Derek
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Old 12-07-2012, 08:53 PM   #11
motolab
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Quote:
Originally Posted by bisbonian View Post
I've got a '99 KTM 640 Adventure.

The stock mid pipe with the big muffler looking thing is on it right now.

Is there anyone who is still making the replacement, straight-thru, mid-pipe?
Check http://www.abp-racing.de/leistungskr%C3%BCmmer/. There's no picture, but "Vorschalldämpferersatzrohr einzeln, für alle LC4 Serienkrümmer bis Bj. 2000" is the correct item.

Regards,

Derek
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