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Old 07-06-2008, 12:42 PM   #1
Raw_force OP
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KTM 640 Rattle!!! HELP me plz

Hi there, searched everywhere it seems, cant find anything about this.
just bought a 2002 KTM 640 Enduro, and it seems to run fine, but it also has a loud rattle from somewhere, the former owner said it had to do with the skidplate, and toldme that if i removed it the rattle would go away?

now my question is, should i be worried?
or is this a fairly common thing?

hope to hear from you guys soon since i can't wait to ge out and ride again.
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Old 07-06-2008, 01:56 PM   #2
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Yes the skid plate rattles

Yes,
the skid plates will rattle pretty good.
What I did was take a piece of 1" dia. clear vinyl tubing, cut 6-8 pieces about 1" long then split them length wise.
Remove the skid plate and slip them over the frame, a couple in the front and 2- 4 in the back. And put the skid plate back on
The back of the skid plate is unsupported and really rattles around, it might take a couple of tries to get the positions right.
It will make a big difference when you get it right.
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Old 07-06-2008, 03:21 PM   #3
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great, i really hope thats it.

appreciate yor respond.
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Old 07-06-2008, 03:40 PM   #4
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You might want to give us a few more details on the noise, like when, where... etc. (at idle or at speed - what RPM - etc.).
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Old 07-06-2008, 08:21 PM   #5
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Quote:
Originally Posted by ChrisC
You might want to give us a few more details on the noise, like when, where... etc. (at idle or at speed - what RPM - etc.).
ya, the PO might be referring to the skidplate reflecting engine noise, and not making the noise itself. the LC4 makes quite a bit of noise even when properly maintained and tuned too.
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Old 07-06-2008, 09:08 PM   #6
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Easy to check - remove the skidplate and ride it. See if bad noises are vastly reduced. Mine made a racket too, until I ditched the std. skidplate.
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Old 07-06-2008, 10:53 PM   #7
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The Alum skid plate is a loud speaker reflecting engine noise.
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Old 07-07-2008, 04:01 AM   #8
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it's hard to descripe, butat idle i hear nothing, in 1. it's quite loud and i think the noise is constant just masked by wind and exhaust when going faster.
it's going on the Dyno today, so hopefully i can see something there, will get it on video for you to see.

and my enduro does not have a rev counter "yet anyways."
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Old 07-07-2008, 07:13 AM   #9
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Here you go

My bike on the DYNO.
need a bigger jet sor sure, but othervise quite what i expected.
also listen for the rattle. is it surpose to sund like that?

http://www.motorcykelgalleri.dk/html...p?VideoID=3473

thanx
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Old 07-07-2008, 08:44 AM   #10
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My 07 640A seems to rattle around 30-35mph around 3000k, usually third gear, (not the decompressor sound-at least dont' think it is), it seems to do it when going up a hill, on flat ground seems ok, once the rpms get higher or I down shift it seems to go away. If a valve were out of spec would it rattle at all times or just at certain rpms or engine load? I try to keep the RPM lower to keep it quieter but is it better to run it mid range around 4000rpm, I have less than 5000k on it with stock gearing.
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Old 07-07-2008, 09:01 AM   #11
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go ahead steal my thread!
it seems we have more or less the same problem, so i guess it all helps.
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Old 07-07-2008, 09:37 AM   #12
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Sorry for the hijack but figured it was similar
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Old 07-07-2008, 09:55 AM   #13
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Talking My LC4..

sounds better since I bought an mp3 playa..
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Old 07-07-2008, 10:25 AM   #14
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The lc4 engine does kinda have it's own clickity clack noise that, as far as I'm aware, is normal.

When I bought my 02 640E the dumb PO had shoved a bar weight in the bars, but didn't do it correctly so it was rattling around in there causing a racket.

Also, the body plastics can vibrate together sometimes which can make a noise at speed. Sometimes if you can apply a piece of weather stripping in the right place, it can help minimize this.
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Old 07-08-2008, 08:32 AM   #15
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still haven't gotten a chance to take off the skid plate, bt im sure thats it. it feels like it vibrates more in 1. and 2. gear, is there some sort of limitation on these gears? and can it be removed?
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