Author Topic: My 2011 KX Conversion  (Read 390 times)

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Online Painlesstom

  • Painless Tom
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My 2011 KX Conversion
« on: December 30, 2020, 05:53:06 PM »
Finally built the KX motor for my 2011. I need to lighten my boat up now, but this motor definitely screams a little louder than my 21/17 motor. haha


Tom

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Online Painlesstom

  • Painless Tom
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  • Posts: 6514
  • Age: 46
  • Location: Georgia
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  • Making Your Mokai... A Better Mokai!
    • Painless Products
  • Engine: 1 EX21/17 / 2 KX21
  • Model Year: 2003 / 2011 / 2015
Re: My 2011 KX Conversion
« Reply #1 on: January 29, 2021, 08:31:34 PM »
Previous trips I got 4260-4320 sustained rpm and oil temps up to 235, which is hotter than I'm used to seeing. So richened up the main jet and saw 4380-4400 sustained with 212 oil temp. My ES-kape KX21 gets 4420-4450 after rejet, so I might go a little fatter and see if it helps.
Tom

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Offline Hillbilly

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Re: My 2011 KX Conversion
« Reply #2 on: January 30, 2021, 10:07:38 AM »
So interested in how the jetting changes both power and motor/oil temp on your motor, Tom.  Your testing is teaching us a lot.  Are you drilling out the jet or using a pre sized Mikuni or off brand jet?  It would be great to know the optimal jet size for the KX carb with your new exhaust.  Thanks

Online Painlesstom

  • Painless Tom
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  • Posts: 6514
  • Age: 46
  • Location: Georgia
  • Cool Points: 73
  • Making Your Mokai... A Better Mokai!
    • Painless Products
  • Engine: 1 EX21/17 / 2 KX21
  • Model Year: 2003 / 2011 / 2015
Re: My 2011 KX Conversion
« Reply #3 on: January 30, 2021, 11:23:50 AM »
I've been using a torch tip cleaner to open the jets up and gauge size. I have bought jets from Jets-r-Us in the past, but the last order they sent the wrong size and their adamant no return policy forced me to go back to sizing my own. I have a miniature drill set coming and I will see it the jet size I need correlates to any of them.
Tom

  >:D    

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