Derestricting FI Bike

[numark1]

I said i would help my friend take the 33bhp restriction off his CBR600 F4i on monday. Its a fuel injected bike so i presue its just some kind of restriction on the throttle as it only moves about an inch when you twist it.

Anyway i have taken the washers out of countless carbed bikes but never seen an FI bike before.

Anyone got any tips or know how to do it/what to look for??

Thanks.

[Bezzer]

The throttle is only a 1/5th turn one anyway so it won't be that, could well be a special restricted ECU as the old style restriction mods on inlet or exhaust would bugger it up totally with a standard ECU.
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I used to be indecisive but now I'm not quite so sure.

[tony532]

might be in the airbox.

restricting air flow and the ecu will adust accordingly.

[Bezzer]

[p0peye]

Hi all,
long time since last post, but as this topic exactly covers my problem, I thought to continue here, and not to open another one...

Note: who don't have time to read all the intro stuff: Skip the italic
So - here we go:

2 years ago I bought a wrecked '03 CBR 600 F Sport (yes, I know they were manufactured just in '01 and '02, but the first registration was '03 and so it is...)

I am 35 y.o., and I have driven bikes since my 7th year. However - I sold my last bike ('92 CBR 600 F2) 4 years ago, so I thought it will be OK to get back my feeling...

I got it back in few days (I wanted to say minutes, but then someone might claim that I am showing off ), but I have driven her limited last year, as I didn't have time to deal with that issue...
I got a son in February last year, changed a job, had a family tragedy...

Anyway - I did manage to run away from home and do it in one afternoon, but I run in to a problem:

I managed to remove 4 diffusers from the boots between injection and engine head, I looked at cable, but no cable limiter was found. The butterfly valves opens completely (90 degrees)...

And then, when I got it back together - almost nothing happened.
A slight improvement in acceleration, a bit more revs, but all together - minor changes...

I snooped around on https://forum.cbrforum.de/viewtopic.php?t=25982 but the major problem was my language, as I speak English, and just a bit of German, so as I wsa posting in English, limited people was able to respond.
There might be someone on that forum knowing how to solve my problem, but if he don't speak English - he can't help...

Anyway, if (Google translate and) I understood well - the only way to reduce power on F4i is with this restrictions. I got an answer that no electr(on)ic limit is known for an F4i...

But, a friend of mine asked me recently if I have a restriction on my exhaust also - I will check as soon as I grab some time, but I definitely don't have a standard exhaust on her - it is a titanium ARROW (made out of 5-6 pieces connected with springs)...

Any Ideas what should I do next (except to check an exaust)?

Thanks and regards,
N
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++Only a biker knows why a dog sticks his head out of a car window++