Talk some sense into me

stangkag
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Maybell, CO US
stangkag
Edited Date/Time 6/9/2019 7:46am
Ive got 2 bikes bought within the last 6 months but they both bog at wot and run like crap here @ 6000 feet of elevation. I live in the mountains of Colorado and just want to ride, im tired of playing the guessing game and buying different jets only to still have a crappy running bike. Do I trade them in on a new EFI bike?

2006 KX450F and 1998 KX125


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stevemartin
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Evanston, WY US
stevemartin 6/8/2019 9:36pm
6/8/2019 9:36pm
Find a jetting chart for each bike. I live in Wyoming at 7000 ft, ride as high as 11000 feet. Multiply the stock jetting sizes by .92 and that will be good for high altitude, main and pilot. I have an 05 KX 125 I jetted this way off the pro circuit recommendations and I ride it at home, and I raced it at the 125 all star race at thunder valley with no issues. Of course make sure every passage and jets are clean, and the air filters are clean. You’ll probably need a leaner needle for the 125 as well.
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Bruce372
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Bruce372 6/8/2019 11:06pm
6/8/2019 11:06pm
Get efi and enjoy riding and not messing with jets and breathing gas all day
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The Shop

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blockhead17 6/8/2019 11:09pm
6/8/2019 11:09pm
Alta baby!!! Can pick them up cheap now, probably be a collectors item one day too
8
nascarnate326 6/9/2019 2:26am
6/9/2019 2:26am Edited Date/Time 6/9/2019 2:27am
Trade them in on a 2018/2019 kx250. Efi and that new bike feeling.
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Fourth_Floor
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7/13/2016
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Saint Marys, PA US
Fourth_Floor 6/9/2019 4:16am
6/9/2019 4:16am
blockhead17 wrote:
Alta baby!!! Can pick them up cheap now, probably be a collectors item one day too
Fuck that!! I was extremely close to buying one a month ago until I started reading through the Alta owners forum and seeing guys that are dead in the water due to battery issues and other guys riding around with no fenders on for fear of breaking them because parts are unobtainable. That and dealers that are stuck with them are still asking $10,000 which is mental.
kb228
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Mansfield, OH US
kb228 6/9/2019 4:44am
6/9/2019 4:44am
Id look into getting a bike you like.
KHI Guy
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Cleveland, OH US
KHI Guy 6/9/2019 7:46am
6/9/2019 7:46am
That 125 is going to bog and run like crap regardless, especially at high altitude. KX 125s from that era ran like the airbox was stuffed full of rags. Only hope is to crate it up and send it to someone closer to sea level, like myself. Smile
77Moto
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CA
77Moto 6/9/2019 8:52am
6/9/2019 8:52am
stevemartin wrote:
Find a jetting chart for each bike. I live in Wyoming at 7000 ft, ride as high as 11000 feet. Multiply the stock jetting sizes by...
Find a jetting chart for each bike. I live in Wyoming at 7000 ft, ride as high as 11000 feet. Multiply the stock jetting sizes by .92 and that will be good for high altitude, main and pilot. I have an 05 KX 125 I jetted this way off the pro circuit recommendations and I ride it at home, and I raced it at the 125 all star race at thunder valley with no issues. Of course make sure every passage and jets are clean, and the air filters are clean. You’ll probably need a leaner needle for the 125 as well.
What people dont realize is that no matter what you are riding or driving, at 10,000 you have ~30% less HP naturally aspirated.

Whats crazy is I live at USA feet of 1,200 and we have ridden up to 13,500 at times in the Rockies and all I do change the main and drop the needle 1 notch or 2 depending on the temp before we leave to head out.
We unload around USA feet 8,500 so thats what I put in so it's plenty safe anywhere we go since its mostly all up from there.. Might adjust the air screw a tad but really, takes me all of 5 minutes. I don't understand how people have such a hard time with it.


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motorscross
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Broomfield, CO US
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motorscross 6/11/2019 8:31pm
6/11/2019 8:31pm
stangkag wrote:
Ive got 2 bikes bought within the last 6 months but they both bog at wot and run like crap here @ 6000 feet of elevation...
Ive got 2 bikes bought within the last 6 months but they both bog at wot and run like crap here @ 6000 feet of elevation. I live in the mountains of Colorado and just want to ride, im tired of playing the guessing game and buying different jets only to still have a crappy running bike. Do I trade them in on a new EFI bike?

2006 KX450F and 1998 KX125


bro i think those are fuel injected
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