Maintenance & Technical > KX500 Original
kx500 power opinions
jfabmotorsports.com:
--- Quote from: kaw rider on May 13, 2009, 12:48:29 PM ---Hillclimb
what year 250 do you have. I'll run some sims for you. It's all in the set up.
--- End quote ---
Hey...Run a sim for me too, please....kx450f, 72 hp, modified to fire every stroke and runs on premix :-D
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KXDINO:
Tharden
check the power valve arm , exiting clutch cover, pull pv cover off. Check and adjust shaft by loosening 10mm nut . my k5 is about middle of adjustment, it made a difference, I had no top end power. there is a hole in the shaft, by loosening 10mm nut, poke a small allen key in hole , and adjust the shaft then tighten , do this then ride if not happy try again , its a case of experimenting to suit you.
i found it best in the middle of adjustment.
my k5 blows off 250's and 450's in the sand up to fifth gear easliy, it will wheelstand in fourth gear in the soft sand .
let me know how you go
kxdino
Polar-Bus:
--- Quote from: KXDINO on May 14, 2009, 09:38:37 PM ---my k5 blows off 250's and 450's in the sand up to fifth gear easliy, it will wheelstand in fourth gear in the soft sand .
kxdino
--- End quote ---
Pretty wild claim.
KXDINO:
wild claims you reckon
It's probably helps my k5 is in a kx 250 (01) frame for a start. different geometry helps
piston had window mod, fmf pipe/muffler off a AF500, v force reeds ,and a good sandcross tyre
if you still don't belive jump on the plane and come to australia and see for yourself!!!!!
p.s your welcome to stay at my place so we can compare the 250's and the 450's
tharden:
I checked my power valve assembly and it is working fine. It was very smooth and tight in action. I went back to a 168 main jet and that seems to give it more grunt so I will try that on the long stretch. I feel though my loss is in my riding skills. I admit I am not the best rider which means I need more time out on the trails. Which is a plus for me. Another thing, we did a compression test on the yz250 and it had a whopping 240 psi. I could not believe it. That is 80 psi greater than my 500. But I do understand the 250 is compressing a smaller volume but..
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