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  #1  
Old 11 Feb 2010
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Carb adjustment for altitude CGL125

My Honda CGL 125 lacks power at altitudes over 3000 meters. What is the simplest way to adjust the fuel mixture to get back those 1 or 2 horsepower that I need to climb mountains?

thanks
Andy
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Old 12 Jun 2010
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At altitude, it isn't getting the amount of air (oxygen) that it needs, so either you need to increase the air (modify the intake??) or reduce the amount of fuel to match. going down a jet size is the easy option
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Old 2 Jul 2010
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This may be a bit of a bodge fix, but whenever we were in high altitude areas on ours, I just took the air filter assembly out.

It may have been entirely in my head, but it seemed to work.

Birdy
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Old 2 Jul 2010
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That would certainly have helped the mixture
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Old 3 Jul 2010
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Exclamation

Yep, high up - reduce the main jet a by a size or 2.

Also, when tackling a steep uphill gradient, at altitude - take a ferkin' great long run-up
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Old 24 May 2014
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Having just fought this battle, I'll weigh in.

Get a 75-80 main jet. Problem solved. We went from 40km/h max speed on the flat, back to around 70km/h+. Bikes runs clean throughout the rev range.

We have one bike with a 75, which is slightly faster than the bike with the 80. Excellent economy now - 350km before reserve

Stock main jet is 95.

Random info; Toyota jets fit just fine in the CGs. So, if you're struggling to get one that small, you can hit up a Toyota parts dealer.
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