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Author Topic: 100 cylinder on an 80  (Read 3191 times)

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Offline EricRomanoff

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100 cylinder on an 80
« on: August 15, 2009, 03:24:01 PM »
Hello to all!

        Just picked up a 2000 KX80 that needs a top end due not cleaning the air filter. I'm wondering if I can replace the top end with the 100 clinder and piston? If so do I need the 100 carb? And pipe? Thanks in advance for the help!


Eric R
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Offline USMC 500

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Re: 100 cylinder on an 80
« Reply #1 on: January 18, 2010, 03:14:18 AM »
I have the same question except my wifes 80 is a 1999 and I also thought about putting a flywheel weight in it too make it more user friendly. AAAAny help would be appriciated. 8-)
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Offline DoldGuy

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Re: 100 cylinder on an 80
« Reply #2 on: January 18, 2010, 05:46:30 AM »
Yes the top ends just bolt on to a KX80 & Kx85 bottomend (using the same years). The carbs are the same with different jetting. The pipes have a different part number but a buddy has used both with no difference noticed. Also note the 100 has a different head which you can have the 80/85 machined to suit.

Hope this helps

DoldGuy
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Offline Sapper

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Re: 100 cylinder on an 80
« Reply #3 on: January 18, 2010, 11:16:09 PM »
a few other things you need to do: use a 100 cdi box (timing curve), and change the needle in the carb. If you have a service manual for it, you can compare the differences.
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