Maintenance & Technical > KX500 Original

Parts suggestion, want to change powerband

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paulkx5:
I have a completely stock 90 which is in excellent mechanical condition, but i am not too thrilled with the power characteristics, especially down low.
The suspension etc., are all set for my weight/ riding style, the sprockets are 15/50, stock size tire, the bike is jetted properly. This bike has plenty of power everywhere, pulls front up in all five gears at will. All the maintenance [sp?] stuff, bearings etc., has been done, so I don't have need to worry about all that.
     The bike is very hard to manage down low/ off idle, very little throttle movement makes for big wheelies, this bike is almost violent off the bottom. I would like to soften, or prefferably just smooth out the bottom end without loosing any mid/ top. I have been running 92pump at 40/1 with belray mc-1, i will be switching to race gas in the spring.
    The parts i have been considering so far have been; desert pipe fmf/pc,
fmf/boy reed valve, and or thicker head gasket. My problem is that being a law student, i have very little money to spend on important things like my kx, and need to get it right the 1st time. I can afford $450 or less.
    My question is which of the above, or any other suggestions, or combination, are most likely to change the power curve the way i want.
    Thanks for your advice.

YUNGGUNNAZ:
PAUL,WHAT TYPE OF RIDING ARE YOU DOING?TRAIL,MOTO,DRAG ETC.AND  YOUR WGHT.DON'T WANT TO SUGGEST SOMETHING IN WRONG DIR. FOR YOUR THE USE OF THE BIKE.TIS WILL HELP EVERYONE.

doordie:
paulkx5!
A very simple mods is to raise the cylinder with thicker gasket,that reduce the compression and move the powerband up.You can also retard the advance of ignition.Change the rearsprocket to 44-46.
Put on a flywheel weight.
 :wink:  :wink:  :wink:

paulkx5:
YUNGGUNNZ,  
I weigh 240 geared up, and I ride both trails and a little moto (recreationally), basically I ride everywhere from tight woods to fast open fire roads and do a little mx track riding. I ride pretty agressively, and have been riding since I was seven (21yrs). Hope this helps, if you need more info let me know.
Doordie,
Thanks for the suggestions, which would you suggest I try first?

kawdude:
I vote for the flywheel weight and change the rear sprocket to 48-49.  Mine had a 47 and I went to the 49.  Big improvement.

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