CBR954 - Running like a bag of spanners - Honda Motorcycles - FireBlades.org
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post #1 of 49 Old 05-24-2007, 9:41 AM Thread Starter
 
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CBR954 - Running like a bag of spanners

Attention all CBR954 owners and later....

I seem to have found a Honda that confuses every one! It runs terribly below 6000 rpm and after a full Dyno test it turns out that the fuel mixtures are all over the place.

You can hear the engine hunting badly on tick over and as it gets leaner it gets worse. When the H-Vix valve kicks in around 3000 there is an improvement but it is only after 6000 that the bike runs properly.

What really confuses everyone is the fact that there is no flashing FI light to suggest a fault -

ANy one got any ideas? I have tested the H-Vix, changed plugs and filters, fresh oil etc. all with no improvement....

HELP
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post #2 of 49 Old 05-24-2007, 9:44 AM
 
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Re: CBR954 - Running like a bag of spanners

I'm a silly yank from across the pond.
What's a bag of spanners?
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post #3 of 49 Old 05-24-2007, 10:45 AM
 
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Re: CBR954 - Running like a bag of spanners

Quote:
Originally Posted by JeepinJeff View Post
I'm a silly yank from across the pond.
What's a bag of spanners?
In brit-speak (which for some reason they still call English), a spanner is a wrench.

To the OP, is the bike stock? No aftermarket exhaust, no Power Commander?

--- D
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post #4 of 49 Old 05-24-2007, 2:27 PM
 
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Re: CBR954 - Running like a bag of spanners

disconnect your battery,then reconnect, to reset the ECU
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post #5 of 49 Old 05-24-2007, 2:53 PM Thread Starter
 
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Re: CBR954 - Running like a bag of spanners

Thanks for the swift replies!

The bike is totally stock UK with the exception of an aftermarket end can. I changed back to the standard one to test that, but there was no change.

I have disconnected the battery once, but will definately try it again in case.

Some more info:

The rev needle twitches erratically, there are often leaps of up to 500revs as you try to hold it steady around 3000rpm.

The problem is fuel delivery related, but I'm f~ked if i know what.

No other changes, but I did once get a knee down experience of the unwanted kind due to some enthusiastic roundabout riding after a tyre change! Light impact, but could this have done something.

Oh yes and some one (gender un-specified) who can't reverse parallel park knocked it off the stand.

Will keep you posted on the battery thing - cheers for the tip
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post #6 of 49 Old 05-24-2007, 3:00 PM
 
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Re: CBR954 - Running like a bag of spanners

I'm just thinking out loud, and I'm not that smart so you don't have to listen, but...

1. If it's been down, or knocked off the stand, could the tip-over sensor / fuel cut-off sensor have anything to do with this? Maybe damaged in some way?

2. Are you sure the problem is fuelling, or could it be breathing related as well? Does the 954 have the "flapper" thing in the air intake which opens up at higher revs, like the 929? Could you have some kind of problem with an air intake restriction?

--- D
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post #7 of 49 Old 05-24-2007, 4:41 PM Thread Starter
 
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Re: CBR954 - Running like a bag of spanners

Thanks for the thoughts Duster,

Yes the 954 does have the flapper in the air box, but as to the breathing issues, they seem to be the same on the move and standing. certainly there is an imbalance on the Dyno sheets and the bike runs really lean (not just a little bit, we are talking major to the point of almost leaving the dyno graph scale!) but an imbalance of the magnitude shown could only really come about from a starving of fuel. Without ram air when standing (as on the dyno) i can't see any other way of overloading the air intake - except a massive gaping wound in the inlets....but then that would be an issue from start to finish.

Fuel injection and computers suck!!!!
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post #8 of 49 Old 05-24-2007, 5:19 PM
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Re: CBR954 - Running like a bag of spanners

Try installing a Power Commander and making a custom map.

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post #9 of 49 Old 05-24-2007, 5:31 PM
 
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Re: CBR954 - Running like a bag of spanners

Did you try unplugging the O2 (lambda) sensor?
The RPM needle tells me that it's ignition related, but then you would have high HCs (Hydrocarbons) because of the missfiring. Did you check the emmissions upstreem of the cataletic converter?
If not, you are not reading it properly.
You can also check the ECM with a known good one (NOT A NEW ONE!!!).
But nothing really makes sense because it clears up at 6000+ RPMs. With that symptom alone, I would suspect the TPI (Throttle Position switch) or fuel injectors. Take them out and check the spray pattern.

Ride Red
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post #10 of 49 Old 05-26-2007, 6:43 AM Thread Starter
 
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Re: CBR954 - Running like a bag of spanners

Thanks again for the ideas...

I am trying out all of them where possible so please keep them coming....

Red - a power commander and custom map may well improve things, but it is also more likely to disguise this problem than fix it. I would love to be ble to try it, but the quotes for a power commander over here are silly to the point of suicidal and I don't have the cash at the minute.

Ned - as a UK rider and owner, we are thankfully spared some sensors and items on our bikes. I am pretty sure the O2 sensor and cat system of which you speak don't exist on my bike. I like you TPS and injectors idea and will try to get a second to check them this weekend.

Once again, huge thanks for the ideas..... keep em coming and keep me busy in my garage!
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post #11 of 49 Old 05-26-2007, 4:04 PM
 
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Re: CBR954 - Running like a bag of spanners

Quote:
Originally Posted by crashmatt View Post

Oh yes and some one (gender un-specified) who can't reverse parallel park knocked it off the stand.

reverse parallel park? does that mean they pulled in forward? or does it mean they were just pulling out of the parking spot?


I don't see the problem, it runs fine over 6000. just ride with it up there all the time

if you can't convince them, confuse them.
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post #12 of 49 Old 05-26-2007, 5:16 PM
 
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Re: CBR954 - Running like a bag of spanners

Did you try resetting the ECU, like i suggested ? Doesn't cost you a dime to at least try that route first
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post #13 of 49 Old 05-26-2007, 8:24 PM
 
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Re: CBR954 - Running like a bag of spanners

I'll see what the Honda manual says..

Honda says a lot lol.

Could be;
pinched fuel tube breather from the gas tank.
air cleaner dirty.
restricted air flow.
restricted fuel flow.
clogged muffler.
faulty fuel pressure regulator ( note: this makes more sense to me personally because it works off of engine vacuum ).
that flap thing in the airbox ( dont' know the name, but it lets more air into the throttle bodies at higher engine speeds ), maybe the low speed air travel is blocked somewhere inside the air ducts or box.
Loose insulator clamp/s at the throttle bodies or airbox.
Improper ignition timing ( ignition pulse generator faulty)
(note: if not one of these items is the cause, check the ECM connectors inside for corrossion)
Could also be a bad ECM box.
spark plugs fouled.
oil level too high/too low. or contaminated.

after that you don't want to know what they say.

Honda doesn't say if some dumb woman knocks your bike over while parking, "this is what's wrong" lol. Maybe it is a the tip over sensor or fuel cut off solenoid ( like mentioned by another user here above). They may have been damaged somehow in tip over incident?

Last edited by Fastrr; 05-26-2007 at 8:51 PM.
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post #14 of 49 Old 05-27-2007, 12:45 AM
 
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Re: CBR954 - Running like a bag of spanners

Has the bike been sitting for a period of months? If so it could be your fuel pressure regulator. The diaphragm gets brittle and causes fuel issues.

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post #15 of 49 Old 05-27-2007, 12:40 PM
 
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Re: CBR954 - Running like a bag of spanners

Quote:
Originally Posted by JeepinJeff View Post
I'm a silly yank from across the pond.
What's a bag of spanners?

It sounds like a ducatti ticking over!!
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