KTM 640 SM Exhaust modification - Page 5

Sycamore · 04-28-2006, 06:11 AM

Quote:

Originally Posted by lost1

I hope you have this exhaust thing all fixed up. I drilled mine out too before finally giving up on it.

lost1

Exhaust thing turned out perfectly.

The carb info on this site (thanks Creeper, Meat and everyone else concerned) is amazing. I punched a few 10mm holes in the back plate of the muffler, re-jetted carb to 152,5, raised the needle, reduced rear sprocket by 2 teeth, and now she is pulling like an ox, it's amazing. Or like a camel I should say. Better than having a new bike.
I took it to a friend who tunes bikes for desert riding, he insisted on pulling off the part indicated in the pic (is that the snorkel?). Seems to be a heck of a lot more air going through, might be my imaginantion but I think i can actually hear the airbox sucking. But it's feels extremely good, not lean at all, smmoth acceleration all the way through.
Anyway I could go on and on but suffice it to say I'm very happy.

herobikes · 04-28-2006, 10:13 PM

Snorkel it is , jet accordingly with more airflow.

lost1 · 04-28-2006, 10:39 PM

glad things are working out for you. Some say leave the snorkel in and modify the side of the airbox. I removed the snorkel and opened a hole in the side of the airbox. was quite happy with the results.
as for the sandstorms. that sand blasted my face so bad that I had to sit and wait in my tent for a couple days.
Dubai is way too humid for me, better to move further inland. I know its hard to leave the airconditioners...

i would bring you an an exhaust for your bike, but I don't know when I will be in the UAE next. THe camel may be a better courier at this point

overlandr · 04-28-2006, 10:44 PM

Quote:

Originally Posted by lost1

i would bring you an an exhaust for your bike, but I don't know when I will be in the UAE next. THe camel may be a better courier at this point

Camel Couriers rule!!

overlandr · 04-28-2006, 10:52 PM

Quote:

Originally Posted by meat popsicle

What courier service is that?!?

Its the one where I have to wait for some spare space in a suitcase!

positionsize · 02-17-2008, 09:23 PM

I belive Coughinhk has found the answer to modifying the European Silencer (N0N-Supertrap model)that is Stock on the 640Adv and 640SM delivered to Europe and Australia.

The link to his thread is HERE and quotes from his thread below

Quote:

Originally Posted by Coughinhk

Exhaust diagram
The end cap unscrews and reveals the spark arrestor. I cut this out and then used a 38mm hole saw to separate the center pipe from its mount. If I had used a larger hole saw it would have left a flange on the centre pipe that might cause a bit more back pressure and reduce noise etc. So if I was gonna do it again I might start with a 50mm hole saw or something, although that would probably need a more powerful drill and controlling the bugger would be very hard ! Anyway, next I cut 83mm off the end of the exhaust. I fitted the end cap to the shortened pipe (not so easy cos the exhaust is multi-walled and the nuts braised onto the inside of the end cap interfere with the inner exhaust wall.) It took about five hours to make my own race exhaust. Badly.

P.S. Doh ! Just realised the arrow in my diagram in the bottom right is going the wrong way. But you realised that already right ?

positionsize · 02-17-2008, 09:36 PM

Quote:

Originally Posted by Coughinhk

and this is the scrap I was left with. It's gonna be pencil pot one day....it weighs about the same as a rear rack !

What came off

positionsize · 02-17-2008, 09:38 PM

Quote:

Originally Posted by Coughinhk

Needs a little cosmetic work methinks....but it's shorter (which looks much better), lighter and gives much more power and torque so I'm happy

A pic of the 'finished' exhaust.

tdv · 02-17-2008, 10:21 PM

Kind of offtopic, but..

Seeing how you guys are desperate for a good sounding exhaust

, may be you'll be interested in the Twinfire Ti full exhaust for KTM LC4 (dual canisters) I have which is collecting dust. I'm pretty sure it'll fit years other than '01 - that's the one I had it on.

It sounds awesome, worked very well on my bike.

Sorry for the pic - the only one I could find.
I'll make and send additional ones if needed.

Make an offer

(I'm in the Bay Area, CA, US)

Dmitri

positionsize · 02-17-2008, 11:09 PM

Thank for the offer tdv. I have already installed a Staintune Slip-on and I am very happy with it. I have also performed the standard performance mods suggested by so many on this site. My 640a not only sounds better but the bike has noticeably more power through the entire range of throttle.

My reason for posting the above information is to hopefully help out some others wishing to make pennytech mods to there stock Euro/Australian exhausts.

If I had this information six months ago, I would have done the mod and probably saved my self $499.00 USD I spent on the Staintune.

meat popsicle · 02-18-2008, 10:18 AM

Quote:

Originally Posted by tdv

Kind of offtopic, but..

Seeing how you guys are desperate for a good sounding exhaust

, may be you'll be interested in the Twinfire Ti full exhaust for KTM LC4 (dual canisters) I have which is collecting dust. I'm pretty sure it'll fit years other than '01 - that's the one I had it on.

It sounds awesome, worked very well on my bike.

Sorry for the pic - the only one I could find.
I'll make and send additional ones if needed.

Make an offer

(I'm in the Bay Area, CA, US)

Dmitri

FYI,

KTM changed the distance between the exhaust flanges with the Hi-Flo Head on 2003, so I believe anything with a Hi-Flo head will not fit that exhaust that worked with the lo-flow head. Too bad, because I might have been interested...

tdv · 02-19-2008, 11:17 PM

Quote:

Originally Posted by meat popsicle

FYI,

KTM changed the distance between the exhaust flanges with the Hi-Flo Head on 2003, so I believe anything with a Hi-Flo head will not fit that exhaust that worked with the lo-flow head. Too bad, because I might have been interested...

Thanks for the info! I'll pass it on to potential buyers.

Dmitri

Raw_force · 07-21-2008, 04:04 AM

have the same model exhaust onmy KTM. DAM something...
made a a few mods on mine aswell, took out the sparkarrestor drilled 6 10mm holes on the outside of the S-tube and rejettet my carb from 142,5 to 155.
it sounds a lot better now but it feels the same. I haven't had a chance to really rip loose yet, but i'll let you know.

just out of interrest did you remove the S-pipe or just drill around it?

i thought about removing everything inside the exhaust an and installing a steel net tube with new wool around it...like the duke modification.

will it have enough resistance or will it be too much?

thanx.

04-28-2006, 10:13 PM	#62
herobikes HE AINT HEAVY HES MY LC4 Joined: Apr 2005 Location: DOVER , NEW HAMPSTER Oddometer: 207	Snorkel Snorkel it is , jet accordingly with more airflow.

02-17-2008, 10:21 PM	#69
tdv Adventurer Joined: Nov 2006 Location: San Francisco, CA, US Oddometer: 96	anyone interested in full Remus twinfire for '01 ktm lc4 sm? Kind of offtopic, but.. Seeing how you guys are desperate for a good sounding exhaust , may be you'll be interested in the Twinfire Ti full exhaust for KTM LC4 (dual canisters) I have which is collecting dust. I'm pretty sure it'll fit years other than '01 - that's the one I had it on. It sounds awesome, worked very well on my bike. Sorry for the pic - the only one I could find. I'll make and send additional ones if needed. Make an offer (I'm in the Bay Area, CA, US) Dmitri __________________ If only I knew what I'm talking about! tdv screwed with this post 12-28-2008 at 06:19 PM

07-21-2008, 04:04 AM	#73
Raw_force Dansker! Joined: Apr 2008 Location: Esbjerg Denmark Oddometer: 49	. have the same model exhaust onmy KTM. DAM something... made a a few mods on mine aswell, took out the sparkarrestor drilled 6 10mm holes on the outside of the S-tube and rejettet my carb from 142,5 to 155. it sounds a lot better now but it feels the same. I haven't had a chance to really rip loose yet, but i'll let you know. just out of interrest did you remove the S-pipe or just drill around it? i thought about removing everything inside the exhaust an and installing a steel net tube with new wool around it...like the duke modification. will it have enough resistance or will it be too much? thanx. __________________ Best Regards Bjoern Vest Hansen KTM 640 Enduro

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04-28-2006, 10:39 PM	#63
lost1 Adventurer Joined: Dec 2003 Oddometer: 53	glad things are working out for you. Some say leave the snorkel in and modify the side of the airbox. I removed the snorkel and opened a hole in the side of the airbox. was quite happy with the results. as for the sandstorms. that sand blasted my face so bad that I had to sit and wait in my tent for a couple days. Dubai is way too humid for me, better to move further inland. I know its hard to leave the airconditioners... i would bring you an an exhaust for your bike, but I don't know when I will be in the UAE next. THe camel may be a better courier at this point

02-17-2008, 11:09 PM	#70
positionsize Gnarly Adventurer Joined: Jan 2007 Location: Arizona, Florida and Philippines Oddometer: 103	Thank for the offer tdv. I have already installed a Staintune Slip-on and I am very happy with it. I have also performed the standard performance mods suggested by so many on this site. My 640a not only sounds better but the bike has noticeably more power through the entire range of throttle. My reason for posting the above information is to hopefully help out some others wishing to make pennytech mods to there stock Euro/Australian exhausts. If I had this information six months ago, I would have done the mod and probably saved my self $499.00 USD I spent on the Staintune.