Maintenance & Technical > KX500 Original
kx500 outlaw kart motor
sandblaster:
Oh man.... I've been wanting to do a KX500 Kart engine for some time....
Jason Tanner who does all my builds for me has been doing several CR500 Kart motors but it seems in that game KX500's are far and few between.
In fact, his build won the local championship last year.
https://www.youtube.com/watch?v=wEC_voeVpws
Can you make the KX500 competitive?
Oh yes you can.... :-D
Most of what you said you would like to do is ok.
But there is some easier ways to do it.
Don't raise the transfers or ports... Lift the entire cylinder using a spacer and two base gaskets.
A good number to shoot for on the port timing is 191.
191 give a good all around power range...
Don't get me wrong, 194 will work but it will start making the engine a bit peaky.
You can get really close to 191 by lifting the cylinder approx .080".
That means you would need a .060" aluminum spacers available from Cometic, one .020" standard base gasket, and one modified .020" base gasket also available from Cometic.
But before I go further, is the engine pulled apart?
If not, watch this vid and get the info asked for.
https://www.youtube.com/watch?v=eTjceU2M7kw&t=110s
funkj:
Sandblaster, thanks for the responce. After lurking for a week I was hoping you would would be one of those who offered advice. :wink:
Yes, I'm excited to do the project. Just watching him run mid pack with a bone stock kx5 eBay motor with who knows what kind of time on the motor against some well prepped pro build Cr's motors I hope is an indicator there is a ton of potential in a Kx5 equally prepped.
His present plan is to buy a used cylinder/head and make the proper modifications and continue to race his present motor and at some point change them over and have the same modifications for a spare cylinder/head. Maybe even change the second cylinder/head up a bit depending on the performance of the first.
He located a in-expensive 85 cylinder (non Pv) that needs plating but I really didn't feel as if I had enough info/knowledge to pull the trigger on that and suggested we stay with the same year cylinder for simplicity.
sandblaster:
What year engine is it?
What fuel do you plan to run?
What carb and intake is on it?
Does it still have all the gears in the trans or are you using only one gear? Usually 4th...
funkj:
1.Not sure what year, he hasn't identified it yett but he thought it was 88 or 89.
2. I think right now he runs 93 pump
3. Stock carb/intake/reeds and cage.
4. No gear delete , yet.
5. I thought he ran a Sup pipe , but my buddy says he run's a stock pipe.
sandblaster:
Ok, well... there is plenty of room for improvement :lol:
One thing to remember.. When you have the cylinder plated, be sure to add .001 inch of extra clearance.
Kart engines get ran on the cold side and I have seen a number of them cold seize.
There are some key differences in the cylinders by year,
Post a pic of the left side of the cylinder...
You don't want the 85 cylinder.
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