Maintenance & Technical > KX500 Original

kx500 outlaw kart motor

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sandblaster:
Option one works well and gives a lot of power,,
Option two gets freaky power  :-D

funkj:
More discussion.. :lol: :lol:

Came across a  86 kx500 jug for sale.b. Looking at some of the data provided on the site, states that year is factory stock port timing at 192 /119 . Seems a little big on blow down and a little light on transfer duration to me.

funkj:
Anybody know what the factory specs are.on the 86 head?

sandblaster:
I don't have head specs for the older K5's but I can tell you that if a 86 top end is done correctly they can be a rocket..





https://youtu.be/5D6_9w3KlAI

7X KX500 Drag championship winner Jeff Grawbarger uses a 86 top end on this bike with a 89-04 bottom end.
Yes, I know the specs.
No, I can't tell you  :lol:

But I will tell you this... Less has been done to this then you might think..
And that bike is freaky fast...

umberto:
I thought I read somewhere that the 89 and up bikes were detuned a bit from the earlier 86-88 bikes. Is that true?

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