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Throttle issues?

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I just bought a 07 RMZ450 and it runs good, shifts smoothly, and is real powerful but sometimes when i first crack the throttle it falls on its face.... but if i let of the throttle and twist back into it it takes off does anybody know why its doing this? i rode a friends 426 and it did the same thing.

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Read the sticky in the jetting forum about setting your pilot jet and fuel screw. sounds like its too rich off idle. What altitude are you at?

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it has the quick knob at the bottom of the carb to adjust with your fingers...?? I'm new to all of this so bare with me.... 1026ft above sea level

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Turn it all the way in and then turn it out 1.25 to 1.5 turns out. This is a stock setting and works really well. You will notice it popping on decel very noticeably if it's set wrong.

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