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Old 08-15-2013, 10:53 AM   #1
mesopotamia OP
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Strange vibration on 2012 990adv between 5000-6000rpm

I submit the situation I have with my 990 adv 2012 as the dealer is not able the find was is causing it after 2 diagnosis attempts. Here it is: there is a strange engine vibration between 5000-6000rpm, enough so that it's incomfortable to stay in that rpm range while cruzing. I have tried another 2012 990adv and I could feel a vibration on acceleration, but only in a very short rpm range (5000-5100).

The dealer cannot spend more time on it because he says the problem is not "important" enough and ktm won't pay for more investigation. The dealer checked the chain, throttle body and sensor, anything that could be loose. He also retorqued the engine bolts.

Anyone experience something like this? Any ideas what it could be?
Thanks to all.
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Old 08-15-2013, 11:11 AM   #2
Lurkerlou
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Old 08-15-2013, 11:47 AM   #3
bajamcguide
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my 990 smr has the bad vibe at around 5000 rpm's but only in 6 gear and under 70 mph. kinda like the motor is lugging a little. if I down shift to 5 th and ride at 5000 rpm, I don't feel the vibe as much

That being said, will need to know more about your bike. how many miles. aftermarket parts, ect. Could be the throttle bodies are out of balance, sometimes reloading a different map helps

Let us know what you find
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Old 08-15-2013, 02:01 PM   #4
mesopotamia OP
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Originally Posted by bajamcguide View Post
That being said, will need to know more about your bike. how many miles. aftermarket parts, ect. Could be the throttle bodies are out of balance, sometimes reloading a different map helps
Let us know what you find

You're right, I should give more details about my bike. Has only 2000 miles, and is completely stock. I just added vibranators to try to reduce the vibrations in the handlebars. It helped a bit. I must add that the dealer reinstalled the mapping but it made no difference.
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Old 08-15-2013, 02:44 PM   #5
bajamcguide
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Other things to check;

throttle bodies not seated correctly ( air leak)
running to high a gear, ie lugging the motor thru that rpm range
chain tension
throttle bodies out of balance
broken or cracked motor mount bolts
swing arm pivot bolt loose
coil pack not seated properly on spark plugs
bad spark plugs, ie slight miss
clutch bolts loose

You could lower the final gearing to see if that helps with problem you are having at your cursing speed
HTH
Tim
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Old 08-15-2013, 02:49 PM   #6
MortimerSickle
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http://advrider.com/forums/showthread.php?t=697087
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Old 08-15-2013, 03:13 PM   #7
andybeets
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Check valve clearances- these engines are very sensitive to it & to ensure they run smoothly the valves must be all of a similar gap. Had the same problem on my 950 and tried everything , had shimmed them myself but got an inlet a bit tight so got back in to check them, shimmed it properly and now shes lovely and smooth....
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Old 08-15-2013, 03:14 PM   #8
mesopotamia OP
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Originally Posted by MortimerSickle View Post
Thanks for the link. That said, my bike vibrates like it is now since day one. I'll also add that I can feel the vibration even when bike is in neutral on center stand, so nothing to do with the chain. Also, te vibration is the same at any gear.
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