ADVrider What sprocket sizes are stock on 990R
 Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

 06-30-2013, 06:13 AM #2 alongat OP Beastly Adventurer     Joined: Jan 2010 Location: Toronto, Canada Oddometer: 1,253 And I just counted the teeth on the back sprocket - 42 so my bike has a 16/42 setup. __________________ Toronto, Canada KTM 1190 ADV, KTM 530 EXC Gone: Ducati 999R, KTM 530EXC, KTM 990ADV-R, KTM 950ADV, KTM 690, KTM 640ADV, kTM RC8R, Ducati 996S, Yamaha R1 And how can this be? For he is the Kwisatz Haderach!
 06-30-2013, 07:06 AM #3 laramie LC4 crash test dummy!     Joined: Sep 2004 Location: Tucson, Az Oddometer: 2,447 yup 16/42 is the stock ratio on the 990R. divide 42/16 = 2.625, 45/17 = 2.647, 45/15 = 3.0 and so on....the lower the number, the taller your gearing. i have no idea how your smaller tires will affect/change the ratio but i'm sure a little google work will get you a formula. laters, laramie __________________ DON'T TRUST CUT 7! HE IS A CROOK! ASK ME HOW I KNOW. '12 LC8 990R, '02 LC4 640, '05 WR 450f (part-out), '98 XR400R, '76 KE100, '05 525 (Step-Child)
 06-30-2013, 07:25 AM #4 alongat OP Beastly Adventurer     Joined: Jan 2010 Location: Toronto, Canada Oddometer: 1,253 I've done the calculations - based on my new wheel/tire circumference, going with one tooth up in the front or three teeth down in the rear will get me extremely close to what I had before changing the wheels. I'm wondering if people are running 17 tooth front sprockets from a clearance standpoint. __________________ Toronto, Canada KTM 1190 ADV, KTM 530 EXC Gone: Ducati 999R, KTM 530EXC, KTM 990ADV-R, KTM 950ADV, KTM 690, KTM 640ADV, kTM RC8R, Ducati 996S, Yamaha R1 And how can this be? For he is the Kwisatz Haderach!
 06-30-2013, 07:36 AM #5 rider911 Shortcut Navigator     Joined: Sep 2009 Location: Australia Oddometer: 515 All 990s used to come std with a 17T front sprocket. Im not sure what year they started putting 16T on. I use 17/45 on my bike most of the time but if im doing a softer ride with some bemmers then I will use 17/42 to give it a few more legs. __________________ New RR ~ Across OZ... Corner by Corner 08 KTM 300 exce (small) 12 KTM 500 exc (medium) 07 KTM 990 Adv (large)
 06-30-2013, 01:26 PM #6 alongat OP Beastly Adventurer     Joined: Jan 2010 Location: Toronto, Canada Oddometer: 1,253 Ok, so it sounds like a 17 does fit. Now, does anyone have an opinion on whether or not to get a standard front sprocket or the KTM dampened sprocket like the one on it now? Can anyone actually feel any difference? __________________ Toronto, Canada KTM 1190 ADV, KTM 530 EXC Gone: Ducati 999R, KTM 530EXC, KTM 990ADV-R, KTM 950ADV, KTM 690, KTM 640ADV, kTM RC8R, Ducati 996S, Yamaha R1 And how can this be? For he is the Kwisatz Haderach!
 07-01-2013, 10:02 AM #7 spafxer Beastly Adventurer     Joined: Mar 2007 Oddometer: 2,651 The 17 dampened sprocket fits for me, and I do not notice any noise difference from the un dampened sprocket. I assume when they do noise tests with machines, the dampening must make a difference ! (of course they use stock mufflers too. Long gone for most of us!)
07-01-2013, 01:20 PM   #8
Trail bandit

Joined: May 2012
Location: Flatistan Nebraska and Melbourne, Australia
Oddometer: 206
Quote:
 Originally Posted by rider911 All 990s used to come std with a 17T front sprocket. Im not sure what year they started putting 16T on. I use 17/45 on my bike most of the time but if im doing a softer ride with some bemmers then I will use 17/42 to give it a few more legs.
I like the legs on the 17/42. Note. It doesn't look like its going to fit. You've got to get it sitting just right then it just slips in place with no room to spare.

Rekluse clutch gives the best of both worlds. You can run good highway gearing and crawl speeds with no clutch use.

I'm up to 160 miles on a tank of gas. 1/3rd dirt trails and balance highway. Very interested when I go to fill up what the mpg is going to be. Low fuel just came on.

 07-01-2013, 01:54 PM #9 woodchuckexc Studly Adventurer   Joined: Feb 2008 Location: Pacifica Ca. Oddometer: 801 Why an "R" if you plan on riding street? It seems like such a waste to take a thorough bred offload beast and mount street wheels.
07-01-2013, 02:48 PM   #10
FakeName
Wile E Coyote SuperGenius

Joined: Jan 2007
Location: San Diego
Oddometer: 1,865
Quote:
 Originally Posted by alongat Ok, so it sounds like a 17 does fit. Now, does anyone have an opinion on whether or not to get a standard front sprocket or the KTM dampened sprocket like the one on it now? Can anyone actually feel any difference?
It's always been my understanding (I could be wrong, and often am) the dampened sprocket is meant to be gentler to the power train.
__________________

2014 500EXC Black

07-01-2013, 03:52 PM   #11
spafxer

Joined: Mar 2007
Oddometer: 2,651
Quote:
 Originally Posted by FakeName It's always been my understanding the rear sprocket "cush drive" is meant to be gentler to the power train.

There, you are not wrong !

07-01-2013, 08:35 PM   #12
MortimerSickle

Joined: Dec 2005
Location: Rainville, Orygun, where moss is a road hazard.
Oddometer: 12,540
Quote:
 Originally Posted by FakeName It's always been my understanding (I could be wrong, and often am) the dampened sprocket is meant to be gentler to the power train.
spafxer has it right: Rear cush yes, but the rubber on the front sprocket dampens only noise. It does nothing to cushion the drive.
__________________

"When I was a young man, I liked to race my horse...." -
G.H.W.S. 1878-1962

07-01-2013, 11:17 PM   #13
keener
Speed changes you.

Joined: Feb 2010
Oddometer: 1,016
Quote:
 Originally Posted by MortimerSickle spafxer has it right: Rear cush yes, but the rubber on the front sprocket dampens only noise. It does nothing to cushion the drive.
And it dampens a lot of noise, the front sprocket that is... I tested this riding with engine off in natural. I compared two sprockets.
__________________

 07-01-2013, 11:21 PM #14 keener Speed changes you.     Joined: Feb 2010 Location: Toronto, Canada Oddometer: 1,016 Surprised no one has mentioned this here yet: http://www.gearingcommander.com/ __________________ 04 ADV 950
07-02-2013, 06:51 AM   #15
MortimerSickle

Joined: Dec 2005
Location: Rainville, Orygun, where moss is a road hazard.
Oddometer: 12,540
Quote:
 Originally Posted by keener And it dampens a lot of noise, the front sprocket that is... I tested this riding with engine off in natural. I compared two sprockets.
I guess I'm deafer than I had thought.
__________________

"When I was a young man, I liked to race my horse...." -
G.H.W.S. 1878-1962

 Share