Honda CBR XX Forum banner

Solved - 2005 Blackbird, surging @ 2 - 3k - rough running, fuel, plugs? help!!

63K views 126 replies 41 participants last post by  Luna Negra 
#1 · (Edited)
Hi all.

Hello and welcome:welcome: from Sunny UK (well it is currently :) )

I purchased a 2005 Blackbird in April after p/x'ing my 2006 CBR 600F. I would never thought of owning a Blackbird until I rode one and I’m very pleased.


Anyway, I have a strange problem that I’m hoping someone can help with.

I'm aware of the overheating issue that I have read everywhere, but I think this is different.



I don’t think my Bird is running properly. It's difficult to describe, but I call it a "surging" or running rough. To better explain, when the bike is cold it runs lovely, but after 15 odd minutes of riding, I’m guessing when the cold start is now off, it surges or hunts. So, when I’m going along at a steady 60 mph at 5000 rpm, I can feel it tugging or surging, i.e. not smooth. (my 600 never run like this). If I sit on the bike with it running and hold it at say 3k, you can see the rev counter moving up and down and not staying at a steady 3k.


Could it be fuelling, spark plugs, blocked injectors? It's covered 10k and in good condition.

It's been in for a service at Honda last week, but they did not find a fault. I guess i need to book it into a specialist, but I would like to check myself first.


I'm concerned as I’m off to France on Friday and it will take away the enjoyment if it is not right.:(



Any help / advice will be greatfully received.
 
See less See more
#116 ·
Hi. You are right. Looks like the O2 sensor was only fitted to the 2001+ models.

So not sure what your problem is. Do you have the workshop manual? It says how to check the fuel pressure regulator.

Be aware that even with the O2 sensor disconnected, there is a still a small surge. It is just much more obvious when it is connected. Also some individual bikes seem to be more affected than others.
 
#117 ·
Hello,
I just purchased a '02 FI Blackbird yesterday, and the first thing I noticed was this slight jerking on low revs, rather annoying to ride in the city. I'm glad I found this topic, but before I go tampering with my bike I need to check what has been done to it previously (the bike originates from Germany and the first owner seems to have done quite a few mods to it). It also has an odd knob in lower left fairing with unknown purpose...
And to be clear - what kind of effect does this mod have to cats? I have stock exhaust and no intention of changing it, so does the lambda sensor trick damage the cats?
 
#119 ·
Has no effect on the cats it stops the lean surge which is the jerking at constant throttle low revs you sounds like you're experiencing. Before you mess around with all the other items GeoffXX mentions just disconnect the Lamdba/O2 sensor to 'test' it. Buy the resistor spoken about for a few pennies and bridge the connection which stops it throwing the FI light. Start the bike and take it for a ride, if this makes no difference then clearly its something else - but to be honest its very likely to solve it! I suspect as is most cases with blackbird FI models with cats/o2 sensor they don't get ridden in town basically.
 
#118 ·
TBH you need to give the bike a good service and take any crap off it that isn't standard, the switch you talk of may be a manual fan switch best thing is to switch it on and see, any other mods like power commanders etc need to be removed then start from there, also you might want to check the FPR, prime the system (turn on the key) and see if fuel drips from the vacuum connection (smaller of the 2x pipes) if it drips fuel then it's faulty, the FPR can be accessed by lifting the rear of the tank and it's on the RHS end of the fuel rail

If that doesn't sort it then you could have a vacuum leak on one of the thin pipes below the fuel rail - perhaps something you should check along with the FPR
 
#121 ·
Did the mod, works like a charm. Involved a fair bit of fiddling with the connectors, dropping the tank on ones fingers and suchlike. Disconnected the sensor to test if I got the right one, strangely enough not only did the FI indicator light up, all of them did. :huh: Plugged in the resistor, all went out. Secured with electrical tape, disconnected the battery for 10 minutes, went for a ride, received pleasure. :smilebig:
Recommended :plus1:
 
#124 ·
Hi.

Yes, I believe you could just disconnect the sensor wires and leave the heater wires connected. That would mean the small heater would stay on but probably not a big deal as it would be on anyway when the sensor is operating normally.

I did think of doing this and just cutting one of the sensor wires. But I used a resistor in case I ever wanted to put the sensor back on.

I suggest disconnecting the plug and then going for a ride (with the FI light on, it won't hurt anything) just to make sure it cures the problem, before making any mods.

One thing of note is that I am on to my second Blackbird now. The second is a 2006 (old one was 2005) of similar mileage and it doesn't have the problem to the same extent. In fact I haven't bothered doing the mod on the second one. You can still notice the surge but it is fine to ride using the sensor, unlike the first Blackbird which was really annoying at slow speeds. I guess it is down to other factors. Both have the standard computer etc.

Good luck.
 
#126 ·
I use my BB for commuting so if I had this problem I'd just fit a new o2 sensor as I still want the economy

I doubt in any of these cases that its an ECU problem and that its just a faulty or worn out sensor.

What I think is the problem in the first place is people using additives in the tank which will destroy the sensor (remember Tesco petrol a few years back in the UK ?)

So it makes no difference whether yours has done 1000 or 100,000 miles when this happens.

Other people seem to think its a good idea to add toluene to the tank for example.

Even some instant gasket sealers can damage the o2 sensor.

lastly, if your BB has been bounced down the road at some point in its life then that could have damaged the sensor but if you don't mind drinking the juice and potentially clogging your catalyst (if you've still got them) then I suppose the mods are fine as its your choice after all.

Ps, This is an old thread so i guess these people don't even exist anymore:D
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top