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what jetting should i use??

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I have a 2005 yz125 and i want to get my jetting perfect for where I ride. The elevation where i ride is between 25 and 430 meters. The temperature is never below 5 degrees celcius and never exceeds 30 degrees celcius. Any help greatly aprecitated.

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For your conditions I would start with your stock 410 main jet, a 35 pilot jet, and use the third clip position on your stock (6CHY5-80) needle. Set the airscrew at 1.75 turns out from the fully seated position and you will be within 3/8 turn + or – of the optimum setting. When the temperature drops down to 5C you may need to richen the main to a 420. When the temperatures climb to 30C you may have to go as lean as a 400 main jet.

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