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Discussion Starter · #1 ·
Hi all! I’ve recently bought a super blackbird and I love it! But today I’m having some issues….. so she struggles to start compared to normal but idles fine at just around 1000rpm. But when I pull away and accelerate it bogs, jolts and won’t accelerate like it should or past 8000rpm. Any help would be appreciated.
Fuel pressure regulator replaced 600miles ago
New spark plugs replaced 600miles ago
Injectors were cleaned 600miles ago
Full service 600 miles ago too
 

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Ok, the clues are, slow starting and idles low at 1000 rpm....... Screams battery and/or charging system to me.

If it is, don't keep riding and charging the battery, use a multimeter and do a simple test.......

Leave the bike off any charger and don't ride it for 12hrs beforehand. Hook up the multi meter (volts) and observe the battery volts at rest ....should be up near 12.6v, dropping to 12.2 with ignition on, then while cranking it should be above 9.5v, preferably 11.5. once the engine starts it should fast idle at 14.3v to indicate the charging system is fine.

BTW, the idle for an FI Bird is best set to 1200rpm, 1000 is a tad low.

Run your numbers by us and we'll let you know more, but my gut feeling is your battery is :censored:'d or the R/R or stator is failing because the dying battery has caused them to overheat.

(y)
 

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Discussion Starter · #7 ·
Ok, the clues are, slow starting and idles low at 1000 rpm....... Screams battery and/or charging system to me.

If it is, don't keep riding and charging the battery, use a multimeter and do a simple test.......

Leave the bike off any charger and don't ride it for 12hrs beforehand. Hook up the multi meter (volts) and observe the battery volts at rest ....should be up near 12.6v, dropping to 12.2 with ignition on, then while cranking it should be above 9.5v, preferably 11.5. once the engine starts it should fast idle at 14.3v to indicate the charging system is fine.

BTW, the idle for an FI Bird is best set to 1200rpm, 1000 is a tad low.

Run your numbers by us and we'll let you know more, but my gut feeling is your battery is :censored:'d or the R/R or stator is failing because the dying battery has caused them to overheat.

(y)
Thank you for your reply! I really hope your right as that would be a really nice easy fix!
I will investigate and come back.
 

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Discussion Starter · #8 ·
UPDATE**

so I gave up trying to diagnose the problem my self and took it to Jap Motorcycles in Milton Keynes. He literally found the problem by chance which saved me a lot of money!
as you can see from the photo I had a split fuel hose in the tank due to the previous owner not using a genuine fuel filter. But all good now and running better than ever!!
thanks everyone for your help and suggestions!!
Hand Automotive tire Tire Finger Tread
 

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Well bugger me...... never would have thought of that one, but the fuel flow test might have given an indication :unsure:. It sure pays to check everything with an older used bike (y)
 

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1998 CBR1100XX Super Blackbird
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Good day Folks,

Please forgive me if I am hi-jacking your post, I have a similar issue, but with a '98 Carb madel..

Here is my story and challenge.. My bird stood since February 2022, until end of October. Waited for new fairing kit after a small cosmetic damage only accident. Parts arrived, so I started with the clean up and inspection process of the entire bike. Replaced engine oil and filter, topped up water and replaced the battery (after several jump starts using a 12 volt dedicated jump kit). The bike started first turn and idled proper. Took her for a ride and all went perfectly well, no misfire, no jerking, all was just perfect.
Then, brought her in to the workshop and noticed a small water leak on the pipe on the back side of the engine (under the seat, just above the gearbox casing, in the centre of the engine, thick black pipe with two bolts fastening into the block). I removed it the next day and quite a lot of coolant drained out of it. Replaced the gasket, and topped up the coolant again.
Tried starting, and nothing... It turns and started with a very rough idle only once and then cut out. Tried starting ever since, but nothing, no ignition.
I checked the following:
Fuel flow from the petcock down to carburettors is good
Throttle cable and choke cables are good
All 4 carburettors are opening and closing as always
No blockage of air intake or filter
Fuel pipes and fuel vacuum pipe whole and not leaking
Tested and checked all 4 spark plugs and plug wires and had good spark

Any advise would be appreciated.

Regards
Dewalrus007
 

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Sounds like it might be flooding. Check oil level to see if it's raised and for fuel smell.
We're the plugs dry not fuel wet?
Are you running iridium plugs? It doesn't take much to foul them out. They can look good when they aren't. Even though they spark out of the engine under load they can fail.
 

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1998 CBR1100XX Super Blackbird
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Sounds like it might be flooding. Check oil level to see if it's raised and for fuel smell.
We're the plugs dry not fuel wet?
Are you running iridium plugs? It doesn't take much to foul them out. They can look good when they aren't. Even though they spark out of the engine under load they can fail.
I confirmed oil level good. Checked the plugs and they were all dry. They are the standard spark plugs, not the iridium. Funny enough, I don't get a fuel smell when trying to start. i will try the starting spray and see where that takes me,
Thanks, I will keep the post updated.
 

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1998 CBR1100XX Super Blackbird
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Sounds like it might be flooding. Check oil level to see if it's raised and for fuel smell.
We're the plugs dry not fuel wet?
Are you running iridium plugs? It doesn't take much to foul them out. They can look good when they aren't. Even though they spark out of the engine under load they can fail.
Good day

So the Bird started yesterday.. I didn't touch anything except, I re-connected the fuel gauge plug under the seat... She started, idled and revved without a fuss or fart.. Can it be that plug?

Regards
Walrus
 

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No, that plug has nothing to do with the engine. I would check/clean the ignition switch and the RHS handlebar switch.

Easy 1st attempt is to spray electrical contact cleaner using the extension nozzle direct into hole or gaps in the units.

2nd attempt is to carefully take things apart. Be careful, as the handlebar switch has small parts jambed into a small space.
 

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Yes if it's the 3 wire plug that is at the bottom of the pump well it's the power for the pump. Make sure it's clean. Contact cleaner would be a good start
 

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1998 CBR1100XX Super Blackbird
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Good day,

So, I checked all possible fuel issues, found none. Then, she started again with the misfire and found cylinder number 4's exhaust outlet cold, the rest hot. Which meant the number 4 is not firing. So checked the spark plug and coil wires and all is well. Put it all back and she still had the misfire.. Then after the weekend she started and idled without a fuss. LOL
 

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Coils can be deceptive little critters...... ;) but 1& 4 are linked...:unsure:....

Good idea is to put an ohm meter onto the plug caps and also the leads to make sure they are holding correct resistance. A coil can be faulty and intermittent.....can you get one to test or buy a cheap used one?
 
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