2nd flies and Moto Hooligan Airbox

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Number 6
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2nd flies and Moto Hooligan Airbox

Postby Number 6 » Thu Feb 15, 2018 8:51 am

Hello
I know this has been covered a lot, but just to clarify, removing the 2nd butterflies will weaken or richen the air/fuel mixture? There seems to be conflicting information about this.
My bike is tuned for Akrapovic cans, the SAS has been removed and it has had some head work.
I've just removed the 2nd 'flies and fitted a Moto Hooligan airbox.
Anyone know roughly how the fueling will be now?
Oh shit, I've just realised that this is in the wrong section!
I'll get it sorted..

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bic_bicknell
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Re: 2nd flies and Moto Hooligan Airbox

Postby bic_bicknell » Thu Feb 15, 2018 8:33 pm

Ha ha. :D

Just to show how long ago all the fuss about secondary butterflies was I just cannot remember anything about why we all did this mod! :D :D

Mine has them fitted and I can't remember what we all thought the advantage was, neither what effects they had on fuelling. My bike hasn't been modded for about four years now but runs a full Akro system, no SAS, Power Commander, Moto-hooligan airbox, second gear mod, RC velocity stacks ( I think) and was mapped by HM Racing. I seem to remember the last dyno was about 128BHP and something like 65nm torque but could have been higher. maybe 75?).

It's still fast enough for me. Test rode the 1290 last year and it was seriously more powerful but not £7K worth IMO.
Past: Honda CB125J, Honda TL125, 1963 Triumph Tiger 90, Yamaha RD250, Kawasaki KH250, Kawasaki 400 S3, Kawasaki KH400, Kawasaki Z400J, Suzuki GS750, Suzuki GS1000, Ducati SS900 Superlight, KTM LC4 Supermoto, Honda VFR 800i, KTM Superduke '07.

Number 6
Minimoto racer
 
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Joined: Wed Oct 25, 2017 8:06 pm
Location: Newcastle UK

Re: 2nd flies and Moto Hooligan Airbox

Postby Number 6 » Thu Feb 15, 2018 10:07 pm

Oh well, the 2nd butterflies are off now so they're staying off. Moto Hooligan and RC8 trumpets fitted.
It's an ex-battle cup bike and was making 125bhp on HM Racing's dyno before I started mucking about with it, hopefully I haven't made it worse.
I'll see how it goes once the salt's off the roads then it will be set up again at Dynobike, Malton.
It sounds mental.

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No. 47
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Re: 2nd flies and Moto Hooligan Airbox

Postby No. 47 » Thu Feb 15, 2018 10:34 pm

Afaik, most of us who tried RC8 stacks reverted to OE.
'08 ex-Battle race KTM Superduke 990 R No.47
'08 OE KTM Superduke 990 R
'01 Ducati 996S

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Aphex
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Re: 2nd flies and Moto Hooligan Airbox

Postby Aphex » Thu Feb 15, 2018 11:49 pm

Once I removed the secondary flies engine braking was toned down to a manageable level instead of slamming my nuts into the tank every time i let off the gas.
08 SD, Mivv Suono, Rottweiler airbox. Current map: One some guy sent me from the internet.

Me so Hoony.

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Willh
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Re: 2nd flies and Moto Hooligan Airbox

Postby Willh » Fri Feb 16, 2018 12:40 am

Rc 8 stacks supposedly moved the power and torque higher up the rev range. I didn't care for it. Not a lot of bottom end torque to begin with.

The secondary flies were for noise control and didn't help rideablity as Aphex so eloquently put it :lol:
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850 Commando engined '68 P11 project

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bic_bicknell
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Re: 2nd flies and Moto Hooligan Airbox

Postby bic_bicknell » Fri Feb 16, 2018 5:14 am

Yes, I think I too returned to the OE velocity stacks, that's why I wasn't sure but I checked in my parts drawers and the RC8 items are there.
Past: Honda CB125J, Honda TL125, 1963 Triumph Tiger 90, Yamaha RD250, Kawasaki KH250, Kawasaki 400 S3, Kawasaki KH400, Kawasaki Z400J, Suzuki GS750, Suzuki GS1000, Ducati SS900 Superlight, KTM LC4 Supermoto, Honda VFR 800i, KTM Superduke '07.

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nampus
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Re: 2nd flies and Moto Hooligan Airbox

Postby nampus » Fri Feb 16, 2018 8:59 am

Same here, tried rc8 stacks but went back to oe. I didn't notice more topend power with the rc8 stacks but I did notice a hole in the midrange with them.

2nd flies were removed by most to lessen engine braking, and to smoothen the throttle response.
The last point is debateable though. There are some tuners who say they can get the throttle response smoother with the flies in.

Number 6
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Re: 2nd flies and Moto Hooligan Airbox

Postby Number 6 » Fri Feb 16, 2018 3:09 pm

Ok cheers.
I'm just waiting for the winter salt to wash off the roads and I'll get the bike out for a test ride.
Roll on summer!

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jambox
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Re: 2nd flies and Moto Hooligan Airbox

Postby jambox » Wed Mar 07, 2018 2:05 pm

The initial craze for removing them was to help smooth the throttle, but if you had a decent tuner, they'd benefit more from keeping them in as they could tune the operation.

As for the stacks, like has been said, the RC8 ones moved the torque range. MrZ32 was looking into dual stacks. I like some left the original on the front and RC8 on the rear to help with airflow to the rear cylinder.

Edit* Just realised this is in the 1290 sub, I'm guessing you've got a 990?
05/06 SD, too raw for the journos!


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