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Old 04-08-2015, 09:42 AM   #1
henryroten OP
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Removing Secondaries

Has anyone removed the secondaries on their 990? Results? I have the full Rottweiler intact system on my 2011 990R with all of the smog stuff removed and it was suggested that by removing (unscrewing them and pulling them out...seems easy) huge acceleration gains are realized. I'll probably try anyway cause it would be easy to reinstall.
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Old 04-08-2015, 10:29 AM   #2
txbear55
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All I have ever heard is that it may help with the abrupt throttle response or "twitchiness" that is a common complaint. Never heard of performance increases.
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Old 04-08-2015, 10:43 AM   #3
rattis
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Laugh Incompetence

If, by taken of the secondary butterflies, you would gain untold quantities of extra horse powers I think that the engineers in Mattighofen would have bought throttle bodies without said flies. They cannot be that incompetent, or can they?
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Old 04-08-2015, 11:41 AM   #4
ttraynor
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I had a SMR 990 with pipes/custom map/Motohooligan air box and a SMT 990 with pipes/custom map/Rottweiler air box--and removed the secondaries and shafts. The bikes dynoed 120 RWHP and 119 RWHP respectively. SO I would say little difference in outright performance. I wouldn't bother if I did it again.
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Old 04-08-2015, 01:47 PM   #5
wsmc99
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Mine are removed on my SMT990.
Did it all at once.
Smoother for sure, not sure about outright hp but all taken together the gains are very nice.

http://www.ktmsmt.com/viewtopic.php?f=13&t=5414
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Old 04-08-2015, 03:58 PM   #6
jas123
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Have removed them on my 990 Superduke , but not on my 990ADV. If I remember correctly they are in there for emissions purposes . They also do not fully open , thus restricting airflow.

The Superuke will stomp all over the ADV. To be fair the Superduke has aftermarket pipes, airbox, emissions equipment removed and has been tuned . The ADV is stock and feels tame. Like they are 2 different motors.
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Old 04-08-2015, 04:14 PM   #7
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Please update if you do!



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Old 04-08-2015, 05:09 PM   #8
Maoule
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I wouldn't waste your time; no benefit on my bike, but it was a lot noisier, especially at cruising rpm. And another point, when I put them back, the screws are apparently 'bradded' on the back side so they were difficult to get started. I almost stripped the first one then filed down the others and used blue loctite. Be careful!!
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Old 04-08-2015, 05:33 PM   #9
ttraynor
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[QUOTE=ttraynor;26536736]I had a SMR 990 with pipes/custom map/Motohooligan air box and a SMT 990 with pipes/custom map/Rottweiler air box--and removed the secondaries and shafts. The bikes dynoed 120 RWHP and 119 RWHP respectively. SO I would say little difference in outright performance. I wouldn't bother if I did it again.[/QUOT

Oh--Forgot to mention: The SMR had Motohooligan's ovalized secondaries which may be about like removing them altogether.

Note: Both motors ended up putting out more than they were rated at the crank. Gains to be had fore sure.

Side note: I about RAN OVER my buddy from behind in the lead on his Monster S4 with Termi's ands ECU gunning it up a long hill. And I had my girlfriend on the back.
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Old 04-08-2015, 10:06 PM   #10
mousitsas
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I have the suspicion that by removing them you loose torque below 5k rpm or so, but ain't got the hard facts to prove it...
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Old 04-09-2015, 10:39 AM   #11
jas123
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Lots of info on Superduke.net about this mod
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Old 04-09-2015, 12:14 PM   #12
TSkelly
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I removed them on an 08 990 Adventure that I had as a demo bike for a few months. I did it for the claimed throttle sensitivity improvement. I noticed practically nothing. The G2 throttle cam system helped a little.
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Old 04-11-2015, 03:11 AM   #13
Deviant666
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My 2009 has also a Rottweiler (equivalent), PCV and Autotune. After removing the secondaries I've noticed that the bike seems to rev faster above 4.5-5k rpm to the limiter. Below, maybe a little loss of torque. In general if you ride more like a hooligan, removing the butterflies seems to make the bike more attune to this type of riding...
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Old 04-25-2015, 09:23 AM   #14
henryroten OP
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Quote:
Originally Posted by AJ990R View Post
Please update if you do!



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Finally got around to removing the secondaries....I like it!! In my case it really cleaned up the bottom end (below 3000 rpm lane splitting stuff) and bounces off of the rev limiter way quicker. Keep in mind that I have the full Rottweiler air filter with all of the stuff removed, etc., may not be the same with a stock engine but mine are definitely not going back in!!!
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Old 04-25-2015, 11:51 AM   #15
NKL
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Or you could just open them up in TuneECU
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