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2006 carb setup questions

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Have a 2006 125 small wheel, I just pulled the snorkel and cut the top of the air box around the lip where the snorkel would go. I removed the backfire screen from the intake and now have a FMF slip on installed. I pulled the carb and did a complete tear down and cleaning. I removed the factory 17.5 pilot in favor of a 20 pilot and I ordered a 117 and 120 main jet from info I found on this site. 

1-where should I set the mixture screw after I drill out the brass plug?

2-how do I install the Yahama  ttr125 needle and what position for the clip? Is there a write-up on it anywhere? The ttr kit has springs plastic washer and all kind of stuff with it?

 

Also I'm at sea level in new jersey, my daughter will ride the bike on single track and open trails 

Edited by superdutyscaler

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There's a jetting thread on here, where people list their set-ups. You may find something helpful there.

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