Maintenance & Technical > KX500 Original

Gearing

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Chod:
Hey Guys - I own  a 99-kx500, All of my rideing is in the sand and on trials no hills here in centeral FLA. Im running a 57 tooth in the rear and 15 in the front it runs a 100 or better on top end.Which i dont need or wont.70 on top end would be good and on the bottom end more torque.So what gearing should i run to make this work is thier a scale you can go by.IDE BE THANK FULL FOR ANY INFO :?

amra500:
i run 15/47 gearing here in az and it works great

Purpletj:
I have done some research for you. With the gearing you are running and assuming stock tire size.
You top speed is 85.79 @ 8000 max Rpm's
 
Here is some very useful tools. I have been using these calculators for years on the street bike.
http://www.dansmc.com/mc_software1.htm        <---- gearing calculator

http://www.discounttire.com/dtcs/infoTireMath.dos;jsessionid=GyB1vVm1yXRGZ1nL91BQspZfSjq29n22252jbcFBk4Y1hPKcLyjt        <------ Tire demension calculator

This last site is where I get all the drive ratio's per gear. Including the final drive ratio.
http://www.scribd.com/doc/26508278/Kawasaki-KX500-Excel-Gearing-Calculator-must-download-as-an-exel-file-before-it-works-properly


Enjoy Ricky.

Friar-Tuck:
Hey Chod,
  Guys usually start with the smaller sprocket as the cost is less. I have a 13 on the front which has caused my chain to rub the case.  Unless you modify the sprocket like Cam22 I would stay away from the 13. 
    I have a 51 on the rear and that gives me about 10-15 mph in 3rd at about 1/4 throttle. 
What this does for me is keep the engine high enough in the revs that cracking the throttle will pick up the front end and the engine doesn't load up, and slow enough ground speed not to kill myself.
 With this in first it's like a trials bike.  Obviously I ride mostly single track, woods,and hills.   
  Until I went this extreme on the gearing there was only one or two places I could actually get the bike in to fifth gear, let alone open it up.   
This set up works great for me.  I don't know the top speed as I never calculated it out.   But 45-50 mph is plenty fast for an old fat guy to get from one trail to another.
  I'm not suggesting  this for your situation, just something to compare to or with.
 
 I would recommend getting a 14 and stick with your 47  (stock gearing) on the rear.
    A good steel front is about $20.00  One tooth on the front sprocket feels like three teeth on the rear (to me)
  See if that better suits your situation and then start to consider a rear sprocket change.
Tuck\o/

 

Friar-Tuck:
 Hey Purp,
 Great info. I think that the 57 tooth rear in Chod's post is a typo.  I'd be willing to bet he meant the stock 47.
   Those are great links.  I tried to keep all that stuff and of course lost it all... I'll be putting these  in away for safe keeping.
 Thanks!
    Tuck\o/

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