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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Tempreture and jetting
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[QUOTE="RM_guy, post: 146172, member: 20652"] [b]It’s not just temperature[/b] Humidity makes a difference too. My boy’s 125 runs great when it’s around 80 degrees at 50 to 70% humidity. We rode the other day when it was close to 100 degrees and 100% humidity. His bike had no low end and burbled on the top. By all rights I should have decreased the main and raised the clip but I knew (hoped) the temp would drop so I left it alone. I didn’t feel like messing with the jetting, it was too damn hot. I would have to change it back when it cooled down anyway and I’d rather it be too rich than too lean. Buzz is right, you can’t simulate a main jet change by changing the clip. You need to lean out the entire system (air screw, clip and main jet) to compensate for the reduced oxygen content in the air due to high temperature and humidity. As Buzz said you can probably get away with just changing the air screw and not the pilot jet. In any case, remember that you changed the jetting when it gets cooler and dryer. You run the risk of running too lean and seizing it you don’t rejet. I keep the bikes jetted for the “normal” temperature and just suffer through when it gets too hot. I hate to jet a carb so that may have something to do with it too. If you want to keep track of the different carb settings for various weather conditions you could just change the jets and settings before you ride. Good luck [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Tempreture and jetting
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