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Old 07-03-2011, 08:45 PM   #1
YBDRTY OP
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Front Sprocket

I have 25,000 miles on my 2005 950 Adventure. I have replaced the rear sprocket and the chain but never the front sprocket so I assume it's time. Checking out the KTM parts book, I see that there's 2 diffferent ones. They are both 17-T but one is listed as "Damped" and is a few bucks more. Anyone know the difference or have any recommendations?
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Old 07-03-2011, 09:21 PM   #2
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Yep - 1 has a rubber damper on it that reduces chain vibration and hence makes it smoother (very slight difference IMO). The cheaper doesnt, just a counter shaft sprocket. I prefer the dampened - but in the end they both pull the chain round just the same. Its your choice and $$$ in the end. When you change it make sure the shaft splines are cleaned of any corrosion/rust and install the new one with plenty of high temp grease to prevent rusting, and of course a new lock washer on the nut.
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Old 07-04-2011, 05:53 PM   #3
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Yep - 1 has a rubber damper on it that reduces chain vibration and hence makes it smoother (very slight difference IMO). The cheaper doesnt, just a counter shaft sprocket. I prefer the dampened - but in the end they both pull the chain round just the same. Its your choice and $$$ in the end. When you change it make sure the shaft splines are cleaned of any corrosion/rust and install the new one with plenty of high temp grease to prevent rusting, and of course a new lock washer on the nut.
Does the 990 now have a nyloc nut?
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Old 07-04-2011, 07:29 PM   #4
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Does the 990 now have a nyloc nut?
Not that Im aware of (I have a 950), it doesnt need it. The lock washer is simply a thin splined washer that you bend over to stop the nut from rotating - costs about $0.80 so make sure you buy one.
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Old 07-04-2011, 07:42 PM   #5
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On most bikes, the damped CSS will be about 10 dB quieter than the undamped.
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Old 07-05-2011, 10:01 PM   #6
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Not that Im aware of (I have a 950), it doesnt need it.
You suspect correctly.
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Old 07-06-2011, 11:30 PM   #7
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Huh?

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On most bikes, the damped CSS will be about 10 dB quieter than the undamped.
A 10dB reduction is 90% quieter. The damped sprocket really makes that much difference? I've switched to an undamped aftermarket and haven't noticed 10x the noise level.
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Old 07-07-2011, 04:55 AM   #8
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Question

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On most bikes, the damped CSS will be about 10 dB quieter than the undamped.
How the hell are you going to notice a supposed 10dB change in counter sprocket noise
I've just gone for the undampened 17 and I'll be stuffed if I can notice any real change in the noise levels. Mind you twin Akras without baffles tend to cover everything else in the sound of pure joy
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Old 07-07-2011, 07:13 AM   #9
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If it was 10dB you definitely would notice. dBs are a log scale; a 3 dB increase = twice as loud, 6dB is 4 times, 10dB is approx 10x.
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Old 07-07-2011, 08:27 AM   #10
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YB,

One more collective detail: once you've got your new front sprocket going, make a note to turn it around at about 12 to 15 thousand miles out.

The fronts wear faster than the rears, and this will help extend chain life.

Plus, it gets you behind the countershaft cover to clean it and check that the nut is still tight (which I found it not to be once!)
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Old 07-07-2011, 11:51 PM   #11
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Is Hells Al right this time? I remember that this sprocket is offset, so you can't reverse it. OR, maybe that's ALL the other KTM's?

The diff in sound between these two sprockets is very small. If you have knobs or a tire that's cupped, you'll never even hear it.
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Old 07-08-2011, 05:56 AM   #12
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I would replace both front and rear and chain together. Why waste good money ruining a new chain on old sprockets ???? Or even worse a new chain on one new and one old sprocket ??
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Old 07-08-2011, 12:59 PM   #13
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I would replace both front and rear and chain together. Why waste good money ruining a new chain on old sprockets ???? Or even worse a new chain on one new and one old sprocket ??


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