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Old 05-22-2013, 05:29 AM   #16
Studly Adventurer
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Joined: May 2008
Location: Accross the pond
Oddometer: 962
Originally Posted by Two Moto Kiwis View Post
Hmmm, thats an interesting one, when we disabled the o2s on my (2010) 990 SMR it made such a nice difference it as night and day.

I then took out the second flies which made it worse so put them back in.

I think DSM8's post is valid here by the sounds of it.

What year is your bike Gustavo.Ramos ?

Unfortunatly i don't have a decent dyno operator knowledgable enough to properly work (so many expensive words in a signel sentence) on my 990, so everything is done by me.
so far i keep wht O2's on all the time and try minor changes on the fueling and see how it goes. Timeconsuming yes, but i'm learning quite a bit.
Growing old is mandatory... growing up is optional!

Raid de L'Amitié 2011 RR (link)
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Old 05-22-2013, 08:23 AM   #17
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Joined: Apr 2008
Location: Sunnyvale, California
Oddometer: 6,947
Originally Posted by bikyto View Post
I turned my o2 sensors off and it runs great. I did work on the mapping quite a bit. Unless you have access to a dyno with a professional, tuning the map with the 02 sensors on is impossible at certain rpms.

So many variables....
What were the Butterflies that you installed? I remember them being of an interesting shape (More football shaped than round)
Topes never seem to make me go any faster.
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Old 05-22-2013, 07:35 PM   #18
rossguzzi OP
990 Adv.
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Joined: Oct 2012
Location: Bottom left hand side of OZ
Oddometer: 1,093
Thanks for your input guys. I hope this thread can work in conjunction with the TuneEcu thread to help us get better running bikes.
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Old 08-07-2013, 05:06 AM   #19
Joined: Nov 2012
Location: Wait A-while
Oddometer: 6
Wink 2010 gpr header akra slip akra map

Hey Rossiguzzi.
I put the gpr header and akra map on mine and it sorted it pretty well.
Also got an akra slip on. Similar to what pete640 has on his 950.
You can have a go when we go for that ride
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Old 08-07-2013, 06:22 AM   #20
rossguzzi OP
990 Adv.
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Joined: Oct 2012
Location: Bottom left hand side of OZ
Oddometer: 1,093
This thread lives !

I should update mine.

06, Akra map/pipes, Throttle cam 400, adjusted throttle cables, valves in spec (1 inlet was a bit tight) butterflies removed.

It runs very nice. Not perfect, but close. No poping on decel, just slight crackling. Slight jerk on initial throttle opening, tiny bit of surging at 4-5 k rpm. Almost indecernable.

I want to put on a Uni prefilter I have laying around to see if that changes anything. Might replace butterflies to see if they change things too.

Looking forward to a ride Ale-Ray.
990 Adv 06, Aprilia Tuono 03 Racing gen 1
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