Wild Dog Adventure Riding

Technical Section => Make / Model Specific Discussions => KTM LC4 400/610/640 & 690 => Topic started by: Chukudeer on August 27, 2007, 02:31:20 pm

Title: KTM 640 performance improvement?
Post by: Chukudeer on August 27, 2007, 02:31:20 pm
Good day all, I would like to get a bit more performance from my 640 adv. At the moment it is stock and terribly slow, I'm lucky to see 140km/h and it just fades away on slight uphills. Offroad it is ok, but needs a bit more grunt.

Any suggestions will be greatly appretiated.

What pype works the best for this bike? Any other improvements that might help?
Title: Re: KTM 640 performance improvement?
Post by: Welsh on August 27, 2007, 03:04:43 pm
Hello, Jabu.

Welsh  8)

A lack of self preservation is worth 30HP.
Title: Re: KTM 640 performance improvement?
Post by: topbox on August 27, 2007, 03:07:51 pm
 Posted by: Slimey      Posted on: Today at 02:31:20 PM
Insert Quote
Good day all, I would like to get a bit more performance from my 640 adv. At the moment it is stock and terribly slow, I'm lucky to see 140km/h and it just fades away on slight uphills. Offroad it is ok, but needs a bit more grunt.

Any suggestions will be greatly appretiated.

What pype works the best for this bike? Any other improvements that might help?


 :laughing4: :sign10:
Title: Re: KTM 640 performance improvement?
Post by: bushclown on August 27, 2007, 03:08:42 pm
My last steed was a 640

All i did was put an akra pipe on +- R3000.00 and removed the toplid of the airbox and put a DNA airfilter
Also raised the needle and went a bit better

Most i ever got out of her was 165km/h
Title: Re: KTM 640 performance improvement?
Post by: LostDOG on August 27, 2007, 03:11:59 pm
If that's you in your avatar I think your bike's doing OK.  :o

Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 27, 2007, 03:20:40 pm
 ;D Nope that aint me in the avitar

If that was me I'd be riding a Harley  :D :D
Title: Re: KTM 640 performance improvement?
Post by: LostDOG on August 27, 2007, 03:23:31 pm
Perhaps get to know "Runner" on this forum. Besides being a good guy, he knows his shi'te about bikes. He might be able to advise you.
Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 27, 2007, 03:32:36 pm
Thanks LastDog, I was wondering if the only real performance improvement might not be a trade in for a 990, is it worth going through all the trouble to try and improve on a bike that was never actually meant to go fast on road but to be very competent off road? Yet even off-road one needs a bit more power some times.   ::)

I might just be spoilt with my plastic bike's performance..... ???
Title: Re: KTM 640 performance improvement?
Post by: Beemer Man (RIP) on August 27, 2007, 03:42:49 pm
Good day all, I would like to get a bit more performance from my 640 adv. At the moment it is stock and terribly slow, I'm lucky to see 140km/h and it just fades away on slight uphills. Offroad it is ok, but needs a bit more grunt.

Any suggestions will be greatly appretiated.

What pype works the best for this bike? Any other improvements that might help?
Yes I can help!! ;D SELL THE BIKE!! ;D ;D
Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 27, 2007, 05:15:07 pm
Thanks Beemer man, was it you on the scarred GS I passed coming down Breedts Nek on Sunday? Found some parts lying about at the top........ ::)

Thing is, the KTM 640 is just so much fun off road.....  ::)
Title: Re: KTM 640 performance improvement?
Post by: Leo on August 27, 2007, 07:57:51 pm
I'll go for the pipe and the air filter option, as already suggested. Is the biked tuned optimally ? 140 does not sound right, unless you weight something like the oke in your avatar  ???

You could also play with the sprocket, that's a win / loose combo, either you gain speed and loose power, or visa versa.

If all else fails put a BMW sticker on the side  ;D  or even better a WD sticker top go flatout  ;D
Title: Re: KTM 640 performance improvement?
Post by: Runner on August 27, 2007, 09:03:58 pm
The best single improvement one can make to that bike is a Keihin FCR 41 carb and then a pipe .Ihave had poor results with DNA filters they clog quickly offroad and then the bike does not run at all .640 is much better offroad than 950/990(offroad not dirt road.
Title: Re: KTM 640 performance improvement?
Post by: Nardus on August 28, 2007, 08:02:36 am
Agree, not much you can do. Best is a free-flow pipe and maybe 1 (or 5) up on the jets if you mainly at coast. Take snorkel off. Otherwise, you spending money on bling and that engin is likely to pack up if you fiddle too much.

I would strongly suggest that you get yourself a EXC250 or 300 or even 450 for the offroad and a 950 equivelant for riding over 140kmph.
Title: Re: KTM 640 performance improvement?
Post by: letsgofishing on August 28, 2007, 08:06:57 am
Have you searched the ADV riders forum? - there's a ton of info there!
Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 28, 2007, 08:08:08 am
Thanks Runner, I'll be having a chat to the people at The Roost as well, see what i can do about getting a bit more out of the bike, where might I get my hands on a carb as suggested? And what pype would you suggest? Akrapovic?

Nardus, I have a Beta 525 for offroad play, awsome monster. That might be why I feel the KTM is a bit lazy. The Beta will outperform the KTM from start to top end without a problem. I also have a WR250 that I recently put a FMF pype on and had a jet kit done, the differance is amazing on the small 250. I was hoping for a similar result if the same could be done to the 640.
Title: Re: KTM 640 performance improvement?
Post by: Beemer Man (RIP) on August 28, 2007, 09:09:18 am
Thanks Beemer man, was it you on the scarred GS I passed coming down Breedts Nek on Sunday? Found some parts lying about at the top........ ::)

Thing is, the KTM 640 is just so much fun off road.....  ::)

Ah! the man who did'nt wave back ;D yes Twas mee!
Title: Re: KTM 640 performance improvement?
Post by: Runner on August 28, 2007, 09:14:06 am
That Beta has a FCR fitted just fit that one for the weekend ,the jetting will be fine , then you can see or feel the difference.Those motors are reliable a pipe or carb will not affect reliability.With the stock carb leave the snorkel in rather take off the cover in the airbox cover,those thing are sensitive where the air comes from.It will never run like a 525, those 640 motors are 20 years old.
Title: Re: KTM 640 performance improvement?
Post by: Runner on August 28, 2007, 09:20:57 am
Akra pipe is the only one.Where did you get the Beta from?Ralph?Rather speak to him than the Roost.
Title: Re: KTM 640 performance improvement?
Post by: Kamanya on August 28, 2007, 10:30:27 am
Hang in there, the 690 Adventure will be coming out next year. May see it at the Paris bike show.

That engine is aparently a goody and it is fuel injected.
Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 28, 2007, 11:35:02 am
Sorry Beemer Man, very rude of me,   ::) I do appologise for my rudeness  ;D

Title: Re: KTM 640 performance improvement?
Post by: shark_za on August 28, 2007, 11:39:48 am
Fuel injection is not on my must have list in future.
I dont like rebooting my bike out in the bush.
Title: Re: KTM 640 performance improvement?
Post by: Beemer Man (RIP) on August 28, 2007, 11:41:06 am
Sorry Beemer Man, very rude of me,   ::) I do appologise for my rudeness  ;D
 
Consider it done, nothing a rude Whiskey can't fix ;D

Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 28, 2007, 11:49:26 am
Thanks Runner, just had a chat to Ralph, will take the bike to him.

The 690 shown at the Paris show was a Ralley raid replica and will not be for sale before end 2009 soonest as I understand it.   ??? The enduro versions alledgedly have major transmision problems under testing, the one they used on the Baja only lasted about 120km at race speed. The ones you saw imported by Proaction for some lucky Dakar contenders came in at a hefty R380000 each!  :o


Title: Re: KTM 640 performance improvement?
Post by: Nardus on August 28, 2007, 12:27:19 pm
Slimey - Holy smacker !! If you have such a collection of toys, why not get a proper DS bike for DS purposes. The 640 is rather crap as an off road bike and very crap as an adventure bike. I also do not know why they call it a 640 Adventure !
Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 28, 2007, 01:04:11 pm
Slimey - Holy smacker !! If you have such a collection of toys, why not get a proper DS bike for DS purposes. The 640 is rather crap as an off road bike and very crap as an adventure bike. I also do not know why they call it a 640 Adventure !

Nardus I am starting to see the light, you have a very valid point  ;D ;D

Just put a set of TKC80's on the KTM, lets see if that improves the offroad performance  ::)
Title: Re: KTM 640 performance improvement?
Post by: VooDoo on August 28, 2007, 01:11:24 pm
Just get yourself a 660 Rallye, best of both worlds  >:D
http://www.e-dirt.co.za/oldforum/forum_posts.asp?TID=10290 (http://www.e-dirt.co.za/oldforum/forum_posts.asp?TID=10290)
Title: Re: KTM 640 performance improvement?
Post by: jabu69 on August 28, 2007, 01:49:04 pm
The obvious move would be to get yourself a cheap second-hand 950 Adventure. The 640 LC4 is too old now, and good for lumberjacks only.
Title: Re: KTM 640 performance improvement?
Post by: Nardus on August 28, 2007, 04:18:51 pm
Slimey, be warned a TKC80 for my 950 costed me R1700 yesterday !!!!!!!!!!!!!!!!
Title: Re: KTM 640 performance improvement?
Post by: Leo on August 28, 2007, 09:24:47 pm
Slimey, be warned a TKC80 for my 950 costed me R1700 yesterday !!!!!!!!!!!!!!!!

Bliksem Nardus, that's steep. Does it come with tyre pressure sensors and gold plated rim  ???

Is it because of the "odd" size?

.....and to top it all I guess it's a "made in Korea" jobbie as well  >:(
Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 29, 2007, 12:00:23 pm
Slimey, be warned a TKC80 for my 950 costed me R1700 yesterday !!!!!!!!!!!!!!!!

Yep that the price for both front and back.  :o  But I must say, plenty more fun than the old Saharas I had on. 

Big grin factor  ;D  ;D Took them for a spin yesterday, still smiling!!! Who needs more power if you have proper traction  ;D

I have solved my top end speed problem......if I sit down it goes faster  ;D  ::)

Thanks all for the advice.
Title: Re: KTM 640 performance improvement?
Post by: Ratel on August 29, 2007, 12:32:40 pm
So that is actually cheap then >:D >:D compared to a set for the GS...
Title: Re: KTM 640 performance improvement?
Post by: letsgofishing on August 29, 2007, 01:53:38 pm
Slimey, be warned a TKC80 for my 950 costed me R1700 yesterday !!!!!!!!!!!!!!!!

Yep that the price for both front and back.  :o  But I must say, plenty more fun than the old Saharas I had on. 

Big grin factor  ;D  ;D Took them for a spin yesterday, still smiling!!! Who needs more power if you have proper traction  ;D

I have solved my top end speed problem......if I sit down it goes faster  ;D  ::)

Thanks all for the advice.

Sorry, do you mean R1700 for the front and R1700 for the back or R1700 for both???
Title: Re: KTM 640 performance improvement?
Post by: Chukudeer on August 30, 2007, 11:39:02 am


Sorry, do you mean R1700 for the front and R1700 for the back or R1700 for both???
[/quote]

Both, R860 back and R840 front from Just Bike &Quad