Maintenance & Technical > KX500 Original

i got no top end??

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kix500:
on my 97 kx5 i have a pro circut pipe boysen reeds uni filter. the jest are 162/55 needle#2 the bike pulls hard on the bottom but it doesn't seem to pull so hard on the top or in higher gears 3-4-5. i hear all this talk bout them being bad a$$ but im not sure mine runs to peak. i raced a cr500 and a yz450 and a yz 425 up thunder. the cr wasted me and the 450 and 426 were no to far behind. any suggetions on why it feel this way? compression is 155+ and gears are 13-51 on 19" rims. please help.

thanks
cory

Paul:
Give it some fuel man  :lol:

That 162 will cost you a topend if you're not careful. Those 13/51 gears are much steeper than the stock 14/48 on the CR500 and the 14/47 on the YZ. Push that mainjet to 168, change those gears to 14/47 (stock), and run a 80:1 mix using Amsoil Pro and something hi octane (C12, AVGAS, etc...). You may need a pilot license at that point.

A CR500 on stock gears will get into the low 80's (thats all mine would do at any rate) and my stock KX500 would reach 91 with stock gears. Both of these bikes will walk a YZ (450/426/400) in the topend and pulling department ;)

kix500:
oh yeah i also forgot i have a weighted fly wheel if that makes a differance

Paul:

--- Quote from: kix500 on March 03, 2006, 07:37:50 AM ---oh yeah i also forgot i have a weighted fly wheel if that makes a differance

--- End quote ---

Softens the hit a little, costs some topend, not much though. I hate them myself but if Rick ever comes back he'll tell you they are God's gift to this bike :D

gowen:
kix500, what is your elevation? I had the same issue lacking top-end. But, ended up being a VERY rich mixture. You want some homework or experience? Go through the Jetting Again and again sticky. I had the same exact issue and went through 200+ posts to fix it. Now I walk anything in site and have since then added some nice goodies. ;-)

EDIT: Don't forget to read most. I ended up having to buy about 20 needles and 20 main jets/pilot jets. I came out with a 38 pilot (if I remember right) and a 155 main jet and some wierd ass needle. Buy carb parts from Sudco, they are $5 per needle rather than $30 from Kawasaki. Take time and read the thread. It will give you an idea and you can learn from our trial and errors. Good luck!

EDIT: EDIT: Toss that piece of metal crap called a flywheel weight if you want top-end. It doesn't hurt it bad, but doesn't help it either. Start with the obvious.  :wink:

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