CBR 954 idle misfire / backfires - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

User Tag List

 11Likes
  • 3 Post By MrPickwick
  • 1 Post By BreakItBob
  • 2 Post By MrPickwick
  • 1 Post By MrPickwick
  • 1 Post By unslow1
  • 3 Post By 86122
 
LinkBack Thread Tools
post #1 of 11 Old 04-07-2018, 11:40 AM Thread Starter
Guest
 
Join Date: 12-14-2016
Location: Denmark
Age: 35
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 0
 
CBR 954 idle misfire / backfires

See video here:


This problem started last year.. But not really a problem at the time. It only backfired/misfired very few times...

Now after 6 months of no use, it really got bad..

It sounds like it backfires / making small *poofs* into the airfilterhousing.
When engine is cold there is no problems. (cold start). The first misfiring/backfiring starts about 3-4 minutes after the engine is started from cold. Then it only gets worse, the warmer the engine gets.
Above 2000 rpm there is no problems at all. Engine runs good and pulls great. It only happens below 2000 rpm / idle.

- Problem occurs when engine is getting warmer.
- Problem getting worse, the warmer the engine gets..
- When engine is warmed up to operation temp, the engine sometimes stalls because of the bigger backfires...

I have inspected sparkplugs, coils, every single wire and plug on the entire motorcycle, meassured the resistance in every sensor, coil, rectifier, and so on. All withing specs according to the manual..
I tried disconnecting the powercommander, with no luck.
A long shot, but tried re-install the O2 sensor. No luck.
Also new vacuum hoses, and fuel lines...

What is wrong?
86122 is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 04-07-2018, 1:23 PM
Supporting Member
 
Join Date: 12-21-2015
Location: Lancs ,UK
Posts: 2,000
Mentioned: 15 Post(s)
Tagged: 1 Thread(s)
Quoted: 487 Post(s)
Reputation Power: 0
                     
Garage
Re: CBR 954 idle misfire / backfires

As it's been getting worse , that seems like a part problem, have you done a test on the FPR and maybe even a fuel line check (Pump Pressure)
unslow1, IanDoohan and 86122 like this.
MrPickwick is offline  
post #3 of 11 Old 04-07-2018, 2:35 PM Thread Starter
Guest
 
Join Date: 12-14-2016
Location: Denmark
Age: 35
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 0
 
Re: CBR 954 idle misfire / backfires

Oh yeah, forgot about that... All fuel system has been inspected, tested, and cleaned. Pressure, regulator and so on are testet... New fuel filter...

I think the problem is ignition related...
When I think about it, I only tested the coils when cold. But the problem only occurs when warm.. Didn't thought about that... I will check them tomorrow again, when warm...
86122 is offline  
Sponsored Links
Advertisement
 
post #4 of 11 Old 04-07-2018, 3:03 PM
 
Join Date: 01-01-2018
Location: Stoke-on-Trent, UK
Age: 34
Posts: 130
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Reputation Power: 3
   
Garage
Re: CBR 954 idle misfire / backfires

Quote:
Originally Posted by Fireblade954_DK View Post
Oh yeah, forgot about that... All fuel system has been inspected, tested, and cleaned. Pressure, regulator and so on are testet... New fuel filter...

I think the problem is ignition related...
When I think about it, I only tested the coils when cold. But the problem only occurs when warm.. Didn't thought about that... I will check them tomorrow again, when warm...
seems a logical idea, interested to see how this one pans out. Don't be afraid of taking it back to honda you know... they are pretty good at this stuff
86122 likes this.
BreakItBob is offline  
post #5 of 11 Old 04-07-2018, 3:15 PM
Supporting Member
 
Join Date: 12-21-2015
Location: Lancs ,UK
Posts: 2,000
Mentioned: 15 Post(s)
Tagged: 1 Thread(s)
Quoted: 487 Post(s)
Reputation Power: 0
                     
Garage
Re: CBR 954 idle misfire / backfires

Have you tried these tests with a Peak Voltage Adapter, that is coils and Ignition Pulse Generator
BigdaddyPaz and 86122 like this.
MrPickwick is offline  
post #6 of 11 Old 04-08-2018, 1:54 PM Thread Starter
Guest
 
Join Date: 12-14-2016
Location: Denmark
Age: 35
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 0
 
Re: CBR 954 idle misfire / backfires

OK - So I it backfires on cylinder 3 and sometimes cylinder 1... Very clear to notice when the airfilter housing is removed.

- Tried to switch coils around to different cylinders; no luck

- Did the same with fuel injectors; no luck.

- Then switched the cylinder 3 spark plug to cylinder 2; Feels like it only would backfire on the left side of engine (cyl 1 + 2)

- Then tried to switch around coils again, but left the spark plugs in place; Still cylinder 1 + 2...

I think I found the issue - 2 spark plugs.. I'll order some new.

But they have only been in for about 5000 km. Thats not normal for iridium spark plugs to go at only 5K km.
What could cause this ?
86122 is offline  
post #7 of 11 Old 04-08-2018, 2:25 PM
Supporting Member
 
Join Date: 12-21-2015
Location: Lancs ,UK
Posts: 2,000
Mentioned: 15 Post(s)
Tagged: 1 Thread(s)
Quoted: 487 Post(s)
Reputation Power: 0
                     
Garage
Re: CBR 954 idle misfire / backfires

Have heard there's a lot of fakes going around, did you buy them from somewhere reputable?
https://www.driven2automotive.com/bl...m-august-2017/
86122 likes this.
MrPickwick is offline  
post #8 of 11 Old 04-08-2018, 2:27 PM
Heeza Y Zasch
 
unslow1's Avatar
 
Join Date: 09-14-2008
Location: Tioga County, NY
Posts: 3,032
Mentioned: 28 Post(s)
Tagged: 3 Thread(s)
Quoted: 388 Post(s)
Reputation Power: 59
                     
Re: CBR 954 idle misfire / backfires

Quote:
What could cause this ?
Blowby (low compression) and/or valves being out of adjustment.

A former riding buddy of mine had a neglected 954 and it wouldn't run on 4 during cold(er) months until it warmed up. Valves were WAY out of adjustment and compression down by 35%. After it warmed up, ran a bit smoother, but often fouled plugs.
86122 likes this.

non-Honda fleet: EX250JAF, VL1500LC, ZX600-E1, ZX600-E12
"Some people wonder all their lives if they've made a difference. The Marines don't have that problem." -Ronald Reagan
unslow1 is offline  
post #9 of 11 Old 04-08-2018, 3:24 PM Thread Starter
Guest
 
Join Date: 12-14-2016
Location: Denmark
Age: 35
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 0
 
Re: CBR 954 idle misfire / backfires

Quote:
Originally Posted by unslow1 View Post
Blowby (low compression) and/or valves being out of adjustment.

A former riding buddy of mine had a neglected 954 and it wouldn't run on 4 during cold(er) months until it warmed up. Valves were WAY out of adjustment and compression down by 35%. After it warmed up, ran a bit smoother, but often fouled plugs.
Funny you say that... I did the valvejob on my bike this winter.. 11 of 16 valves, were way to tight... Luckily no valves were burned or damaged... I don't think this bike got the valves checked since it was build.... They are now in specs, so hope the new sparkplugs I just ordered, will hold up a little longer...

Really hope thats the only problem.. Going to Slovakia in 2 weeks for a 4-day-race... So the bike needs to be in shape :-)

Last year on Anderstorp Raceway in Sweden :-D
unslow1, IanDoohan and MrPickwick like this.
86122 is offline  
post #10 of 11 Old 04-08-2018, 3:26 PM Thread Starter
Guest
 
Join Date: 12-14-2016
Location: Denmark
Age: 35
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 0
 
Re: CBR 954 idle misfire / backfires

Quote:
Originally Posted by spagiratwink View Post
Have heard there's a lot of fakes going around, did you buy them from somewhere reputable?
https://www.driven2automotive.com/bl...m-august-2017/
Thats exactly where I just ordered mine from :-)
86122 is offline  
post #11 of 11 Old 04-20-2018, 8:52 AM
 
Join Date: 08-28-2009
Location: York - United Kindom
Age: 65
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Reputation Power: 0
 
Garage
Re: CBR 954 idle misfire / backfires

Talking to another 954 owner at Squires Cafe last year. Low power on pull-away, so he stripped the engine out with a mate, checked it all, reassembled and it still had a sluggish take-off.
Replaced the plugs (not cheap over here) and hey presto - problem fixed.
Red faces and dirty hands, but who was to know?
Youngman is offline  
Reply

  Lower Navigation
Go Back   Honda Motorcycles - FireBlades.org > Honda Motorcycle Models > Honda FireBlade

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Motorcycles - FireBlades.org forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
A valid e-mail address is REQUIRED. You will not have access to any site features until you activate your account using the activation e-mail that is sent to this address.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
RPM'S Jumping at idle, noisy clutch, No load misfire... SOLVED will6576 Honda FireBlade 9 03-30-2016 11:38 AM
cbr 954 rr idle issue vancev General Discussion 6 06-18-2015 5:43 PM
CBR 954 Rought idle yogisays09 Honda FireBlade 14 03-24-2015 8:00 PM
1996 cbr900rr misfire/ hesitant from idle to 3.5k diffinking Honda FireBlade 1 03-15-2015 8:17 PM
954 PROBLEM : Intermittent misfire from idle to 3500RPM King Kenny Honda FireBlade 12 08-27-2011 11:07 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome