Removal of the secondary butterflies

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Removal of the secondary butterflies

Post  stan2nz on Sun 02 Apr 2017, 2:22 pm

First topic message reminder :

what are the pros and cons to removing the secondary butterflies

Anyone done this and what were the results overall
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Re: Removal of the secondary butterflies

Post  Bandakias on Sat 20 Jan 2018, 8:15 pm

@rodent4 wrote:Picked the bike up this morning. Didn't really get a chance to get much of a ride in but it is pulling substantially harder  Cool 

They cut the top out of the air box lid while it was there, not sure yet whether I like the roar or not  Question   If not I have a spare I can fit.
How did you manage fuel? Ecu flash or Pcv?

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Re: Removal of the secondary butterflies

Post  rodent4 on Tue 23 Jan 2018, 5:57 pm

@Bandakias wrote:
@rodent4 wrote:Picked the bike up this morning. Didn't really get a chance to get much of a ride in but it is pulling substantially harder  Cool 

They cut the top out of the air box lid while it was there, not sure yet whether I like the roar or not  Question   If not I have a spare I can fit.
How did you manage fuel? Ecu flash or Pcv?


Dunno, service peeps organised it. I'm gonna drop it into the guy who dyno'd it last time for some feed back.

Bigger fish to fry at the moment though, I was moving it in the garage Saturday and lost my footing and dropped it  Sad

Smashed the fairing and who knows what else. Gonna have a good look at it on the weekend and work out everything else I need. I've already ordered the fairing and support that all the shit bolts to.

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Re: Removal of the secondary butterflies

Post  Bill & Ted on Fri 23 Mar 2018, 5:44 pm

Just removed the secondaries, followed Reardo's method on YouTube using a pencil butane torch and after some research a Posidrive "0" bit.
They came out with no effort at all, has made an amazing difference to the bike, no more dead top end and just more control all thru the rev range.
Once you've gone to the dark-side their is no going back.
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Re: Removal of the secondary butterflies

Post  rodent4 on Sun 06 May 2018, 5:54 pm

Bill & Ted wrote:Just removed the secondaries, followed Reardo's method on YouTube using a pencil butane torch and after some research a Posidrive "0" bit.
They came out with no effort at all, has made an amazing difference to the bike, no more dead top end and just more control all thru the rev range.
Once you've gone to the dark-side their is no going back.

How is it on the warm up, is it warming up quicker?

Mine is, I'm getting the feeling that maybe it's slightly lean at idle  Question It warms up faster than it used to.

I do have a wideband but it's currently in another vehicle and I don't really want to remove it at the moment. Probably take it to the guy who dyno's for me, and if there is an issue hopefully he can sort it via the ecu....I don't really want to run a PC or 3rd party box If I don't have to.

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Re: Removal of the secondary butterflies

Post  Bill & Ted on Mon 07 May 2018, 4:27 pm

Hi rodent4, I haven't noticed any difference in the time it takes to warm up after removing the secondarys.
There seems to be quite a variation between some of these Bandits, just fitted and then removed after one week a TRE which made it run rich in the lower revs making the surging at 2,300 to 2,600 revs worse and increased my fuel consumption, while others have noticed no difference at all.
Think i might put it back on when I can afford a PCV and Autotune module so that it is fixed to a single gear map.
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