Poll - 449/511 EFI butterfly removal

I have thought about this too.
I had the idea, & I may be wrong, but with the FBW butterfly in place there would be some vaccum below it & the map sensor would send signals to the ecu looking for leaner mapping.
With the butterfly removed, an open primary butterfly would have very little/no vaccum at the MAP sensor, the ecu should head off looking for the richer maps.

All just a theory, until I have my AFR meter up & running, but I've put a lot of thought into it (Maybe too much ha ha ha)

I WANT, no NEED one of those stickers

PM me your address.

Well I did do it and it does make a difference. It just thumps hard down low now when you grab all the gas, makes you wonder how the tire stays on the ground. Man you can feel it hitting hard clear up thru the foot pegs. It feels like you could count every combustion stroke as the front end comes up.

just as we all said... thats the feeling we expect from these bikes. And we can't get enough of if.

Really, you sure that's ok? I'm in Australia. That would be awesome.

I reckon you should put 20 or so in the CH merchandise area for the 'no butterfly' bikes.

- Love it

So here I am...
Yesterday was amazing.
A lot of Ktm racing (there was also an Italian Champion). A lot of Honda 450..
Just an HSQ 510 (my friend).

However:

My bike:
Map 3 - Akro setting
Higashi slip on
No O2 sensor
Butterfly removed
all the rest is stock.

The bike is more responsive, no dead throttle. Stock throttle body is not so good. It's too long. Maybe need a rapid throttle.
HP? Nahh.. just an illusion.. it seems to have more hp cause engine is more responsive than before.
Bike runs great, no fail, no crash, no flameout or else...
It's a good free mod but nothing then you could say: "Hey f****r, my bike is a drag".

PS:
For who have SMR. My bike have Pirelli Diablo tyres. This tyres is too hard for race and don't heat.. change them as soon as possible.
For who wanna race with SMR, rear stock wheel is 4.25". it's too restrictive. If you have possibility change with 5"

sound just like our bikes..
with the Butterfly removed, it is deceiving the feeling you could have gained a few horsepower.

Hopefully soon someone comes up with a Dyno Test and we know the results then.

DONT FORGET TO PUT YOUR VOTE on the right place .

Thanks

Dyno test the result speaks for it self there with no doubt be more power may be not top end but bottom to mid power is alot of difference. I must also add thanks to Tinken I did low my oil from Motul 7100 15w-60 to Castrol 10w-40 [he did say mobil]. In my time of having drag cars oils make a lot off HP difference . Like changing a spark plug ,Engine is quiter , clutch feels better and motor is quieter.

I removed mine and did some testing this weekend at the supermoto track on my 2012 TXC511, BIke started fine at 40 degrees and ran great all day temps only got up to 60 or so. No issues to report.

I still get flame outs not sure if its the by pass screw or the TB stud. But feels much better. Will fit the PCV too see if it fixes the problem.

cool - so was top end horse power improved and did you reduce lap times

I didn't notice much difference. Power felt good and lap times were consistent. Might be a little snappier but every little bit helps, I still need some more time to make my final decision, all is well so far.

Just did mine.
Here's what I've got. I put a used JD on my bike before last weeks ride. After that, the bike was running really rough. Seems like the JD and my [alleged] Map 3, make the bike run too rich. The JD added a little more power and bumping the fuel pump feature up really helped with the bogging I had at the bottom end.

After removing the butterfly, before this past sunday's ride, I can feel more bottom end. The front end just lifts off the ground where I used to have to go to great lengths to get her up. If the front doesn't come up, it's because the rear wheel spinning like crazy (still have the stock Michelins).

The bike ran better all day this weekend. I still got one flame out when I was creeping around the little trials area where I was riding. I'm sure the flame outs I'm getting are due to engine temperature. They almost went away after I wrapped the header and put heat shield tape on the lower tank (my gas was boiling). But when you are creeping around at almost idle in first, the bike just can't flush away the heat. That's when I get all of my flame outs.

I am not running any EFI mods other than RM3 and no cat. I had one flame out but I am also in the bad, bad habit of bliping the throttle especially on down shifts into low gears at high rolling speeds. Mine ran 100% when I was stead handed.