KTM 640 SM Exhaust modification - Page 3

rjf · 04-21-2006, 10:44 AM

Quote:

Originally Posted by Sycamore

And a bit of popping when I throttle off.

Could be an air leak in the exhaust, but probably jetted a little lean. Most bikes are standard, to get through emmisions testing apparently.

meat popsicle · 04-21-2006, 11:07 AM

Quote:

Originally Posted by Sycamore

Don't call my can fat and weird, ok? It's the only one i got.

Hey man, you posted pics of your can on the web and now claim you don't want comments?

ChrisC · 04-21-2006, 11:32 AM

Quote:

Originally Posted by Sycamore

I drilled a hole in that mystery plate but the biggest bit i have is 12mm

Two words: hole saw

creeper · 04-21-2006, 11:36 AM

Quote:

Originally Posted by ChrisC

Two words: hole saw

One about the same diameter as that dimple in the center of the baffle would be a good start.

Sycamore · 04-21-2006, 12:08 PM

Quote:

Originally Posted by ChrisC

Two words: hole saw

I tried to get a hole saw today but I could only get one for use on wood. This is Dubai, remember.
When I get my next wooden muffler I know what to use.

meat popsicle · 04-21-2006, 12:38 PM

You got a Dremel? Perhaps that cutting bit might work in there to just cut the whole back plate out?

Sycamore · 04-21-2006, 01:16 PM

Quote:

Originally Posted by meat popsicle

You got a Dremel? Perhaps that cutting bit might work in there to just cut the whole back plate out?

Not a dremel, but I have some drill bits for grinding, they should be able to get through. Or else (worst case) I'll drill a series of holes at each weld and just break through with a cold chisel. That sounds heavy handed but nobody's ever gonna see the ragged edges.

This sounds pathetic but there are very few proper hardware stores here and most are mostly garden furniture and building supplies. Some tools & supplies that you guys take for granted are hard to come by. Couple of weeks ago I was looking for engine enamel (that heat resistant spray paint) - not a chance. Torque wrench? Nope. And Krylon Fusion paint for plastic? In my dreams.

meat popsicle · 04-21-2006, 01:27 PM

eBay?

The only problem is occasionally folks will balk at your location; maybe shipping costs would suck. But there is lots of stuff on there...

http://search.ebay.com/search/search...Krylon+Fusion+
http://search.ebay.com/search/search...engine+enamel+
http://search.ebay.com/search/search...=torque+wrench

I got my CDI torque wrenches off of eBay for a fraction of what they cost new - and they were

(the horde goes for Snap On because they are well know and pass up brands they don't)

Sycamore · 04-21-2006, 01:49 PM

eBay - Location is a bit of an issue, about half (or more) suppliers aren't really interested in shipping outside the US.
But the worst problem with eBay is the delay factor, when I want something I want it NOW. Waiting around for stuff to finish a job, freaks me out.

I end up doing a patch-job with makeshift tools rather than wait a week or whatever for the whole bidding process, shipping etc.
Impatience is the mother of invention.

ChrisC · 04-21-2006, 01:55 PM

Quote:

Originally Posted by Sycamore

Impatience is the mother of the plasma cutter invention.

fickst

Sycamore · 04-23-2006, 07:39 AM

In the interests of science, here's the next layer in the stock European-issue KTM640 SM exhaust.
With a lot of crude drilling and cutting. I removed that mysterious plate shown on page 1 of this thread.

This pic is what I got - the next layer.
This next plate (the one shown here) is about 2 or 3 inches deep into the back of the muffler - probably at the same place that the US exhaust would have the bolts for the Supertrapp discs?
Maybe this Euro-muffler is simply designed to be not modifiable.

The sound of the exhaust has changed very little. Up a decibel or 2, a bit less mushy. Performance, dunno yet. Haven't done anything yet to jetting or airbox.
Maybe I should just leave well enough alone and save my pennies till i can get a Staintune or the like..
Comments?

dagwood · 04-23-2006, 08:05 AM

Quote:

Originally Posted by Sycamore

In the interests of science, here's the next layer in the stock European-issue KTM640 SM exhaust.
With a lot of crude drilling and cutting. I removed that mysterious plate shown on page 1 of this thread.

This pic is what I got - the next layer.
This next plate (the one shown here) is about 2 or 3 inches deep into the back of the muffler - probably at the same place that the US exhaust would have the bolts for the Supertrapp discs?
Maybe this Euro-muffler is simply designed to be not modifiable.

The sound of the exhaust has changed very little. Up a decibel or 2, a bit less mushy. Performance, dunno yet. Haven't done anything yet to jetting or airbox.
Maybe I should just leave well enough alone and save my pennies till i can get a Staintune or the like..
Comments?

now if that had six tapped (threaded) holes in it then that is what the us model looks like.
with a dowl in the hole use a hole saw and cut out the small S pipe. it will come right out...but without the super trapp discs it will be qite abit louder...But WTF do we care how loud it is...it is in the middle of freakin knowhere fer chrisC's sake.

Hack away.

Sycamore · 04-23-2006, 09:53 AM

Quote:

Originally Posted by dagwood

it is in the middle of freakin knowhere fer chrisC's sake.

Hack away.

It may be the middle of nowhere, but my neighbor is a cop with a 6 mnth old daughter, so too many decibels may not be good for me. Would it work to drill a series of 8 or 10mm holes through that second plate until I'm happy with the flow?
That way I can graudually adjust. Yes? No?

meat popsicle · 04-23-2006, 10:51 AM

Quote:

Originally Posted by Sycamore

It may be the middle of nowhere, but my neighbor is a cop with a 6 mnth old daughter, so too many decibels may not be good for me. Would it work to drill a series of 8 or 10mm holes through that second plate until I'm happy with the flow?
That way I can graudually adjust. Yes? No?

Actually that is one method used by USA Supercrapp owners. I believe it was just a matter of drilling some small-ish holes in that endplate just outside of the center pipe... have to dig around; I didn't find the thread in the index.

Good idea to do it one at a time and see how it sounds. Plus, you will want to retune the air/fuel mixture each time so you will get good at that process too!

Sycamore · 04-23-2006, 11:16 AM

Quote:

Originally Posted by meat popsicle

Plus, you will want to retune the air/fuel mixture each time so you will get good at that process too!

Yeah I know, I'm busy tracking down all the BST threads looking for advice on mixture setting and my head is spinning. I've only had the bike a few days so I haven't even figured where the mixture screw is.
And it seems the owner manual doesn't want people touching the carb.

04-21-2006, 12:38 PM	#36
meat popsicle Ignostic Joined: Feb 2004 Location: Circumlocution Office of Little Dorrit Oddometer: 13,839	You got a Dremel? Perhaps that cutting bit might work in there to just cut the whole back plate out? __________________ Kronreif Trunkenpolz Mattighofen LC4 640 Its not so much staying alive; its staying human that counts.

04-21-2006, 01:27 PM	#38
meat popsicle Ignostic Joined: Feb 2004 Location: Circumlocution Office of Little Dorrit Oddometer: 13,839	eBay? The only problem is occasionally folks will balk at your location; maybe shipping costs would suck. But there is lots of stuff on there... http://search.ebay.com/search/search...Krylon+Fusion+ http://search.ebay.com/search/search...engine+enamel+ http://search.ebay.com/search/search...=torque+wrench I got my CDI torque wrenches off of eBay for a fraction of what they cost new - and they were (the horde goes for Snap On because they are well know and pass up brands they don't) __________________ Kronreif Trunkenpolz Mattighofen LC4 640 Its not so much staying alive; its staying human that counts.

04-23-2006, 07:39 AM	#41
Sycamore ^OP d00b Joined: Mar 2006 Location: Dubai, United Arab Emirates Oddometer: 1,692	the plot thickens In the interests of science, here's the next layer in the stock European-issue KTM640 SM exhaust. With a lot of crude drilling and cutting. I removed that mysterious plate shown on page 1 of this thread. This pic is what I got - the next layer. This next plate (the one shown here) is about 2 or 3 inches deep into the back of the muffler - probably at the same place that the US exhaust would have the bolts for the Supertrapp discs? Maybe this Euro-muffler is simply designed to be not modifiable. The sound of the exhaust has changed very little. Up a decibel or 2, a bit less mushy. Performance, dunno yet. Haven't done anything yet to jetting or airbox. Maybe I should just leave well enough alone and save my pennies till i can get a Staintune or the like.. Comments? Attached Images

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04-21-2006, 01:49 PM	#39
Sycamore ^OP d00b Joined: Mar 2006 Location: Dubai, United Arab Emirates Oddometer: 1,692	eBay - Location is a bit of an issue, about half (or more) suppliers aren't really interested in shipping outside the US. But the worst problem with eBay is the delay factor, when I want something I want it NOW. Waiting around for stuff to finish a job, freaks me out. I end up doing a patch-job with makeshift tools rather than wait a week or whatever for the whole bidding process, shipping etc. Impatience is the mother of invention.