KX Riders

Maintenance & Technical => KX500 Original => Topic started by: Motorrad on March 06, 2011, 05:07:31 PM

Title: Flywheel numbers
Post by: Motorrad on March 06, 2011, 05:07:31 PM: Just noticed somthing
Anyone know how to decode them?

My 1991 (team green) bike had the following
F4T1002 71 0601

This 1989 Flywheel on ebay has
F4T1007 71 0601
http://cgi.ebay.com/ebaymotors/MAGNETO-ROTOR-FLYWHEEL-1989-KAWASAKI-KX500-KX-500-89-_W0QQcmdZViewItemQQhashZitem588c534e39QQitemZ380311391801QQptZMotorcyclesQ5fPartsQ5fAccessories

Identical except the last number in the F4..... series...

I swear all the numbers on the later flywheels are also F4T1007.. that I recall seeing..

Anyone else have one that matches my number??
Title: Re: Flywheel numbers
Post by: sandblaster on March 07, 2011, 03:25:27 AM: F4T107 71 FITS 92-04
F4T102 71 FITS 90-91
F3T81171 5701 FITS 86-89
I have it all recorded here:
http://oem-cycle.com/KAWASAKIKX500BIKEID.aspx (http://oem-cycle.com/KAWASAKIKX500BIKEID.aspx)
Title: Re: Flywheel numbers
Post by: Motorrad on March 10, 2011, 12:54:44 PM: Quote from: sandblaster on March 07, 2011, 03:25:27 AM
F4T107 71 FITS 92-04
F4T102 71 FITS 90-91
F3T81171 5701 FITS 86-89
I have it all recorded here:
http://oem-cycle.com/KAWASAKIKX500BIKEID.aspx (http://oem-cycle.com/KAWASAKIKX500BIKEID.aspx)

Very interesting...

I know the stator and flywheel are differant for 90-91, yet the igniter (CDI) is the same as the later ones..

Any idea what they changed? and why?

Must have been a good reason. for them to change the stator and flywheel after 3 years... Big factorys dont just go changing that stuff for no reason.
Title: Re: Flywheel numbers
Post by: kaw rider on March 10, 2011, 12:57:42 PM: they are different let me look at the ones i have. i think i'm buying a 90-91 :-D
Title: Re: Flywheel numbers
Post by: Motorrad on March 10, 2011, 01:43:07 PM: Quote from: kaw rider on March 10, 2011, 12:57:42 PM
i think i'm buying a 90-91 :-D

Did we find somthing good?
Title: Re: Flywheel numbers
Post by: kaw rider on March 10, 2011, 01:47:39 PM: maybe
Title: Re: Flywheel numbers
Post by: byron909 on March 10, 2011, 03:18:02 PM: i am unsure of dimensions off top of head but my 86 rotor is about half the weight of my 94. it looks like it is 30 percent smaller, maybe morei remember looking into it a little, it seems they went to big flywheel in mid 89. i bought an early 89 setup for my 94, it seemed to help alot, made the bike rev easier, felt lighter in the tight stuff. i noticed the same going to lighter rotors on my crs. i am unsure on igniton mapping for the years.
Title: Re: Flywheel numbers
Post by: Motorrad on March 10, 2011, 03:20:01 PM: Quote from: byron909 on March 10, 2011, 03:18:02 PM
i am unsure of dimensions off top of head but my 86 rotor is about half the weight of my 94. it looks like it is 30 percent smaller, maybe morei remember looking into it a little, it seems they went to big flywheel in mid 89. i bought an early 89 setup for my 94, it seemed to help alot, made the bike rev easier, felt lighter in the tight stuff. i noticed the same going to lighter rotors on my crs. i am unsure on igniton mapping for the years.

I have the 87 (small rotor) setup here on the bench out of my (you guessed it) 87 500.. but dont want to go that route...

Im more interested in what they changed between the 90-91 to 92-04 setup (yes it was the flywheel and stator plate).. BUT what? and Why?
Title: Re: Flywheel numbers
Post by: kaw rider on March 10, 2011, 03:39:06 PM: they both weight the same. :-D
Title: Re: Flywheel numbers
Post by: sandblaster on March 10, 2011, 03:43:54 PM: I could get some measurements for the later model but I'm feeling lazy :|
Scratch that, it's all packaged up and ready to ship and I'm not that ambitious :-(
Title: Re: Flywheel numbers
Post by: martinfan30 on March 10, 2011, 03:53:34 PM: Could it be that the the two weigh the same, but had different OD dimensions? Creating more centrifical force with a larger diameter flywheel that weighs the same? Or have I had too many home made brews tonight? :-D
Title: Re: Flywheel numbers
Post by: kaw rider on March 10, 2011, 03:56:22 PM: same OD measurement and weight.
Title: Re: Flywheel numbers
Post by: martinfan30 on March 10, 2011, 04:01:07 PM: Quote from: kaw rider on March 10, 2011, 03:56:22 PM
same OD measurement and weight.

Ok, so would the magnetic "blocks" on the ID of the flywheel be different? Just thinking out loud. If so, that may change the pick up coil intensity?
Title: Re: Flywheel numbers
Post by: sandblaster on March 10, 2011, 04:02:42 PM: Hey kaw rider.
Besides the numbers can you see any discernible differences?
I'm looking at pics but I can see enough details to see any real differences.
Thanks!
Title: Re: Flywheel numbers
Post by: kaw rider on March 10, 2011, 04:11:30 PM: i can't believe i didn't catch this before. With all the talking with the oldguy with the stator being different. If the flywheels are not side by side you more then likely wont catch it.
Title: Re: Flywheel numbers
Post by: sandblaster on March 10, 2011, 04:19:26 PM: You Seeeee! :lol:
Title: Re: Flywheel numbers
Post by: Motorrad on March 10, 2011, 04:20:39 PM: Quote from: kaw rider on March 10, 2011, 04:11:30 PM
i can't believe i didn't catch this before. With all the talking with the oldguy with the stator being different. If the flywheels are not side by side you more then likely wont catch it.

Wont catch what??... I missed it....
Title: Re: Flywheel numbers
Post by: kaw rider on March 10, 2011, 04:28:18 PM: motorrad has the picture of the difference. he is not sharing
Title: Re: Flywheel numbers
Post by: sandblaster on March 10, 2011, 04:30:17 PM: Are you saying that one pic is screwed up?
Title: Re: Flywheel numbers
Post by: Motorrad on March 10, 2011, 04:34:59 PM: Quote from: sandblaster on March 10, 2011, 04:30:17 PM
Are you saying that one pic is screwed up?

No he is talking about the picture he Texted to me (phone)

And now that I have seen that, I can see the differance in all the pictures as well..

I still wonder WHY they changed...

(http://i13.photobucket.com/albums/a289/Motorrad/flywheel.jpg)
Title: Re: Flywheel numbers
Post by: kaw rider on March 10, 2011, 04:42:57 PM: here are the 2 flywheels.
Title: Re: Flywheel numbers
Post by: Motorrad on March 10, 2011, 05:45:31 PM: Very interesting they weigh the same... :? :?
Title: Re: Flywheel numbers
Post by: martinfan30 on March 11, 2011, 01:20:53 AM: So the top(narrower) is 90-91?
Title: Re: Flywheel numbers
Post by: doctord on March 11, 2011, 03:26:10 AM: Other way around.
F4T107 is the newer one.
F4T102 is the older one.