backfiring problems - Kawasaki KFX450 Forum :: KFX450HQ.com
Engine/EFI/Drivetrain Discuss engine, fuel injection, air intake, and drivetrain modifications here.

 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 12-16-2007, 02:19 AM Thread Starter
Senior Member
 
Join Date: Dec 2007
Location: spartanburg, south kakalaki
Posts: 739
View brootgoot's Photo Gallery(0)
let me begin by stating that i have come to this forum out of sheer desparation. i purchased my kfx in summer of 2007. love the bike. this summer i added a k&n airfilter, an ehs airbox cover and a trinity slip on. no problems. in november i took the bike to the dealership shop to get service on it, i was told that one service they would need to do was a valve adjustment. since that time the bike has been backfiring when i go off throttle. i wonder, what could be causing this problem? let me back up by adding that at the same time i purchased the slip on and filter i purchased a dyna tech efi module...i installed it, didnt know how to adjust it, and the bike would shut off, so i removed it.

dealership doesnt know squat about what to do and has hinted that this is my fault for adding the exhaust, airbox cover, and filter. they changed the plug today, and it looked like the bike is running lean (whitish-gray tip). i was told that the backfiring could be caused by the bike running lean.

i know nothing about the inner workings of efi, modules, mapping, etc. i assumed that an efi bike would make adjustments automatically for the slipon, cover and filter.

any help is appreciated. john

Shadey:
because when they told you to go get a green card you thought they said Green QUAD


i just went to the darkside: 2008 z400
brootgoot is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 12-16-2007, 04:21 AM
Senior Member
 
Screamin_Yeller_400EX's Avatar
 
Join Date: May 2007
Location: Arkansas
Posts: 203
View Screamin_Yeller_400EX's Photo Gallery(0)
Quote:
let me begin by stating that i have come to this forum out of sheer desparation. i purchased my kfx in summer of 2007. love the bike. this summer i added a k&n airfilter, an ehs airbox cover and a trinity slip on. no problems. in november i took the bike to the dealership shop to get service on it, i was told that one service they would need to do was a valve adjustment. since that time the bike has been backfiring when i go off throttle. i wonder, what could be causing this problem? let me back up by adding that at the same time i purchased the slip on and filter i purchased a dyna tech efi module...i installed it, didnt know how to adjust it, and the bike would shut off, so i removed it.

dealership doesnt know squat about what to do and has hinted that this is my fault for adding the exhaust, airbox cover, and filter. they changed the plug today, and it looked like the bike is running lean (whitish-gray tip). i was told that the backfiring could be caused by the bike running lean.

i know nothing about the inner workings of efi, modules, mapping, etc. i assumed that an efi bike would make adjustments automatically for the slipon, cover and filter.

any help is appreciated. john[/b]
Yes, you are lean. How could you not know that?

The EFI on the KFX is an open-loop system. It doesn't have an exhaust O2 (oxygen) sensor. Therefor, it cannot adjust for changes in the exhaust or intake. You will need to get a programmer.

Basically, if you keep running like you are, you're gonna ruin you motor. Plus, without properly jetting/programming after such modifications, you won't be getting much performance.

2008 white/black KFX450
DASA pipe, PCIII, FuelATV airbox intake, KX cams, ported head, AC Blackline nerfs, ¼" PRM swingarm skid, Tag Railer chassis skid, UPP urethane case saver, PIAA H6M lights, 15t front sprocket, PB block-off, Spider grips
Screamin_Yeller_400EX is offline  
post #3 of 6 (permalink) Old 12-16-2007, 05:22 AM
 
Join Date: Oct 2006
Location: Mt. Holly, NJ
Posts: 39
Send a message via MSN to jimborph
View jimborph's Photo Gallery(0) Send a message via MSN to jimborph
I suggest you go to the powercommander website and download a new map. The company you bought your pipe from might give you a closer matched map as well. Every time you mod the engine, it will need more fuel and air. Read the pcIII instructions - they will guide you through the map changing. Whatever you decide, DON'T ride it without remapping
jimborph is offline  
Sponsored Links
Advertisement
 
post #4 of 6 (permalink) Old 12-16-2007, 10:29 AM Thread Starter
Senior Member
 
Join Date: Dec 2007
Location: spartanburg, south kakalaki
Posts: 739
View brootgoot's Photo Gallery(0)
Quote:
I suggest you go to the powercommander website and download a new map. The company you bought your pipe from might give you a closer matched map as well. Every time you mod the engine, it will need more fuel and air. Read the pcIII instructions - they will guide you through the map changing. Whatever you decide, DON'T ride it without remapping[/b]
thank you for your quick responses guys. i guess the next thing i need to figure out is (a.) should i try to get the dyna tech to work or (b.) buy the trinity plug n play pc.

do you think i may have damaged the engine by riding it lean for several months? what should i look at to tell if something is damaged?

i know these are newbie questions, but i do appreciate all your responses to my inquiries. john

Shadey:
because when they told you to go get a green card you thought they said Green QUAD


i just went to the darkside: 2008 z400
brootgoot is offline  
post #5 of 6 (permalink) Old 12-19-2007, 02:27 PM Thread Starter
Senior Member
 
Join Date: Dec 2007
Location: spartanburg, south kakalaki
Posts: 739
View brootgoot's Photo Gallery(0)
the backfiring was caused by a hairline crack in the headerpipe. dealership has ordered one for me, so hopefully i'll be up and running soon. btw i got the PCIII, but i have not found any maps for the Trinity slipon and K&N airfilter set up. at this point i plan on running the bike with the cover back on.

anybody want to buy the Dynatek FI controller i got? never been run. doesnt have the crimp, besides that its like brand new. cost 200 plus, will sell for 100.

Shadey:
because when they told you to go get a green card you thought they said Green QUAD


i just went to the darkside: 2008 z400
brootgoot is offline  
post #6 of 6 (permalink) Old 12-19-2007, 07:54 PM
Senior Member
 
Join Date: Oct 2006
Location: SoCal
Posts: 202
View Rogue1970's Photo Gallery(0)
I just saw your post. I was going to suggest checking the head pipe nuts to make sure they are tight. I started backfiring one day and it was because the nuts vibrated out to finger tight.

Glad you found the issue.

2008 KFX450 - Built, Bought, Blown, Sold
1988 Suzuki LT500 2 Stroke [Build]
Rogue1970 is offline  
Reply

  Lower Navigation
Go Back   Kawasaki KFX450 Forum :: KFX450HQ.com > KFX450 Performance > Engine/EFI/Drivetrain

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki KFX450 Forum :: KFX450HQ.com 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
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
problems brentdanos Engine/EFI/Drivetrain 13 05-28-2008 09:42 PM
Problems KFX 700 General Discussion 0 05-22-2008 05:38 PM
Cam Problems duner450 Engine/EFI/Drivetrain 5 05-16-2008 07:58 PM
big problems Puff_Pryor General Discussion 1 06-08-2007 10:59 AM
big problems Puff_Pryor General Discussion 5 06-06-2007 09:07 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 On
Pingbacks are On
Refbacks are On

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