2007-2010 Kawasaki KFX50 SPECS AND MODS. - ATVConnection.com ATV Enthusiast Community



Kids Quads & Other ATV's - Ask an Expert! An area where experts in their field will answer non-general questions about your Chinese made ATV. mywifesquad, LT80, LynnEdwards and other experts will answer your questions as they have time.

Reply
 
Thread Tools Search this Thread
  #1  
Old 04-21-2010, 05:26 PM
Pro Rider
Thread Starter
 
Join Date: Apr 2007
Posts: 406
Default 2007-2010 Kawasaki KFX50 SPECS AND MODS.

Over the next few days, I'm gonna add a little info. on this type of mini quad. Some of the information will be useful to some of you newcomers that needs a little helping hand. This info. comes from the service manual and my personal experience. Blood, sweat, and tears! I do not take any responsibility for any mechanical failure or bodily harm that comes from any mods that you performed from my advise.

First, I gonna add a list of the basic specs, then I will break down each area on the mini.

2007-2009 Kawasaki KFX50 SPECS.

ENGINE: 4-STROKE, SOHC, 1-CYLINDER
Same engine as a GY6 139QMB 50cc commonly used in scooters.

COOLING SYSTEM: Air Cooled

BORE AND STROKE: 39X 41.4MM

DISPLACEMENT: 49.5CM3

COMPRESSION RATIO: 10.8:1

CARBURETION SYSTEM: Keihin PTE 16MM/ AUTO CHOKE

STARTING SYSTEM: ELECTRIC STARTER/ KICK START

IGNITION: DC FIRED 12V CDI

IGNITION TIMING: 13 DEGREE BTDC @ 2000 RPMS

SPARK PLUG: NGK CR7HSA / Iridium CR7HIX9(performance plug)

VALVE CLEARANCE: .04MM(.0016 IN.) ON THE INTAKE AND EXHAUST(COLD CHECK)

FRONT SPROCKET: 16 TOOTH

REAR SPROCKET: 32 TOOTH
Reply With Quote
  #2  
Old 04-21-2010, 05:40 PM
Pro Rider
Thread Starter
 
Join Date: Apr 2007
Posts: 406
Default

First area I would like to cover is the electrical system. Mainly being the CDI. The stock cdi will only allow the engine to run @ 7500 rpms. It moreless cuts out right before it hits its stride. A good +1000 rpms would have done this mini justice.
Now, this electrical system is a 12VDC current system. Meaning, the cdi is powdered by the battery. The cdi needs 12vdc to fire. A AC FIRED CDI WILL NOT WORK! You will only make a molten plastic mess with a AC fired cdi.
There are now a few cdi's on the market that will work with the KFX50/90. I will add them later to a mods list I will make. Stay tuned for more!
Reply With Quote
  #3  
Old 04-26-2010, 08:30 PM
Pro Rider
Thread Starter
 
Join Date: Apr 2007
Posts: 406
Default

I would like to add that the chain is a 428 o-ring type. When adding larger tooth sprockets, you do not have to buy a new chain.There is plenty of chain adjustment. Sprockets can be had a certain vendors, but I found a cheap , good made front sprocket that you can add if you can find it. You can run a 17T front sprocket from JT sprockets. Here is the part number that you will need to reference to find it.

JT SPROCKET PART #: JTF 259.17

The rear sprocket is a little more tricky. Certain mini quads rear sprockets will work,but it also depends on the year, so I won't go into detail what mini quads will work. I will say you can get the rear and front sprockets from Rebel Gears. With only a 17T front and a 28T rear sprocket, you should be able to achieve 17-20mph alone without a aftermarket cdi box.

16x13 roller weights is what you want to order when you replace the rollers in your variator. Total stock weight of all the rollers is 39.5 grams. I tend to run ours at 24-32 grams total depending what gear ratio we run and what engine mods were performed. A good starting point would be around 30-34 grams with a stock engine. Now keep in mind, those 16x13 rollers are for GY6 50cc size, so they can be had for cheap off ebay or any scooter shop. I personally like to run NCY rollers as of late. They are cheap and they make good quality products that exceeds other brands like Koso IMO.
Reply With Quote
  #4  
Old 12-06-2010, 11:18 AM
Weekend Warrior
 
Join Date: Dec 2010
Posts: 4
Default

Quote:
Originally Posted by AIRMOBILE101 View Post
First area I would like to cover is the electrical system. Mainly being the CDI. The stock cdi will only allow the engine to run @ 7500 rpms. It moreless cuts out right before it hits its stride. A good +1000 rpms would have done this mini justice.
Now, this electrical system is a 12VDC current system. Meaning, the cdi is powdered by the battery. The cdi needs 12vdc to fire. A AC FIRED CDI WILL NOT WORK! You will only make a molten plastic mess with a AC fired cdi.
There are now a few cdi's on the market that will work with the KFX50/90. I will add them later to a mods list I will make. Stay tuned for more!
New here and was wondering if this list was posted somewhere else on the site?

Thanks...
Reply With Quote
  #5  
Old 01-09-2011, 07:39 PM
Pro Rider
 
Join Date: May 2010
Location: Interlachen, FL
Posts: 453
Default

Quote:
Now, this electrical system is a 12VDC current system. Meaning, the cdi is powdered by the battery. The cdi needs 12vdc to fire. A AC FIRED CDI WILL NOT WORK! You will only make a molten plastic mess with a AC fired cdi.
Does this mean that I have to have a good charged battery hooked up for it to run even with the pull start (I have seen on here that the ltz-50 and kfx50 are basically the same bike and I have the '06 suzuki model)?
Reply With Quote
  #6  
Old 03-24-2011, 11:10 AM
Weekend Warrior
 
Join Date: Mar 2011
Posts: 1
Default

I have a KFX 50 - I have located the aftermarket CDI- where can I find the wiring to hook it it up- i found one at monstergy6. If theres a better one or different one, please let me know. new here so thanks for the help
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Parts on Prairie not on Kawasaki parts list ReconBayou Kawasaki 2 10-19-2015 02:06 AM
01 sportsman 400 specs. raman8tor Polaris 2 09-20-2015 07:35 AM
Trx vs yfz JakeXBL General Chat 8 09-05-2015 01:08 PM


Tags
139qmb , 2007 , 50 , check , compression , cut , kawasaki , kfx , kfx50 , limiter , manual , modifications , rev , service , speed


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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



All times are GMT -5. The time now is 07:12 AM.


 
  • Ask a Question
    Get answers from community experts
What's your question?
Send