Hi guys, been trying to sort my bike for a few days now. When I bought it it wouldn't rev past 5000rpm without bouncing off some sort of rev limiter. Whike looking for the "speedo limiter" I've read about on misc forums I found this:



Could this be it and how do I go about disabling it?

 

Where did you find that?
I found THIS.

 

I saw the same post and yours where you said about the taped up filter. Went searching for the wire to cut and couldn't see anything so had a look around for video's on the issue and stumbled across one where a guy had an import 400 with the same restricted rev problem and he pulled his speedo apart (180km/h speedo) and saw it sitting in there, along with what he described as a magnetic washer on the back of the speedo mechanism.
On my bike it was zip-tied in a not-so waterproof bag inside the right fairing.
Had a quick search online to find out if the magnetic sensor (two black posts in the middle of it) needed a permanent magnetic source to stop it restricting or no magnetism to work right. In doing so found a post on kiwi-biker or something saying "...yeah we get loads of jdm imports (cbr1000f) over here, I've always just found the 3 pin connector under the clocks, cut the brown/black and orange/blue wires and wire them together to fool the ecu into thinking that the bike is below the restrictor speed". He goes on to say that some add a 10kΩ resistor between them but he's never bothered and never had an issue.
For my issue it would rev up in neutral to redline if I wot it but if I eased it up the revs it would stutter like hitting a rev limiter at exactly 5000rpm and do the same under load while riding it. After wiring it as above I can confirm that (in neutral at least) the bike is revving cleanly through the range now. Haven't had a chance to go out on it yet as family time means no play time unfortunately, though I will be back and post again after I've gone out and given it a proper shakedown blast.
Anywho I hope this helps others with the same issue help to fix the stupid jdm restrictions.

 

Yes did this on my cbr400rr
Also got this from Greybikes
400GreyBike.com - Ultimate Performance
But not knowing the wiring on a 1000f wouldn't like to say

 

I got seasick watching that video.

 

​​​​I hadn't watched the video until I saw the sea sick comment, then yea about 15 secondsinto it I'd had enough

 

Yeah that's the vid lol can't see why you guys sre getting seasick though... I've seen some awful youtube fixes since they implemented the "stabilization" option (I just don't use it)

 

It doesn't start making power 'til 5000 rpm. That's a sad restriction.
I guess it handicaps bigger bikes for a fare drag race against a 150cc scooter.

 

Ok I'm pleased to report that snipping and connecting the black/brown and orange/blue wires HAS removed the rev limit at 5000rpm. (^ω^)V
150@9k says the fix definitely worked (not bad for a 5-speed jdm lol)

 

Cracking result Tim