Close


Results 1 to 5 of 5
  1. #1
    Join Date
    Nov 2003
    Posts
    779
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    29

    What's the difference between a 420 and a 428 chain?

    I just purchased a used 2003 KX-100 for my son's second bike. He is 12 and stepping up from an XR-100.

    I was on my way to the dealer to buy some spare plugs and masterlinks. I decided to check the chain on the bike before heading out, it's a 428. Kawasaki's web site, and a few others state that the stock chain size is 420. I realize the previous owner may have changed the chain/sprockets.

    His XR-100 takes a 428 chain too. I guess I could just use those master links.





    What is the difference between the two sizes? Is the 428 bigger (thicker) than the 420?

    Thanks, Steve.




  2. #2
    Join Date
    Jul 2000
    Posts
    2,063
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    48
    A 428 should have a higher tensile strength than a 420. I would assume that if it has a 428 on it and there are no problems, that you could replace with a 428 and be better off than with a 420.



    m y   s i g n a t u r e:


    Corey

  3. #3
    Join Date
    Mar 2001
    Posts
    7,104
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    98
    420NZ Pin Length 16.65mm, Roller Dia. 7.77mm, Plate thickness 1.8mm

    428NZ Pin legth 18.90mm, Roller Dia. 8.50mm, Plate thickness 2.0mm

    Both chains have a pitch length of 1/2" but are different size chains.
    There is only ~700lbs. difference in the tensile strength of the two, due to the bigger plates on the 428.

    Buy the chain that your sprocket is made for.

    Some KX-100's have 420's, others have 428's. You were told correctly.
    Last edited by Jaybird; 03-11-2004 at 09:28 PM.




  4. #4
    Join Date
    Sep 2001
    Posts
    2,690
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    52
    I have owned a KX-100 with a 420 chain, and another with a 428, and trust me...you are better off with the 428. The 420 is simply too wimpy for the power output of this bike, particularly when hauling around an adult (me). I found that the chain (420) wore enough to need adjustment almost every ride, even with proper lubing. This is/was truly one of the few weak spots of this bike.

    What else? The fork springs are wimpy, and the cooling system is marginal...the bike will overheat if pushed hard enough. A higher pressure radiator cap helps.

    Otherwise, congrats on owning a great bike!




  5. #5
    Join Date
    Sep 2002
    Posts
    266
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Rep Power
    26
    8, but I'm no math major




Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Members who have read this thread: 0

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •