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2005 kx250 jetting

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Just a got a kx250 and its bogs from 3/4 to full throttle in 3rd to fifth gear. I'm thinking it's too lean. It has a 158 main jet which is smaller than stock. Please help.

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What temp and elevation you at

I have a 158 main but I ride at sea level and 80-95 Fahrenheit

What temp and elevation you at

I have a 158 main but I ride at sea level and 80-95 Fahrenheit

Also premix ratio effects jet size as well

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