Surging idle on choke. Not running without.

John C Hannah

XS400 Enthusiast
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Chicago Illinois
The pilot jets are sized up to 145. With stock exhaust and stock air filters. 3 turns out on the mix screw. When full choke It runs super high rpm.

When I take it off choke it dies.
I feel like it's running lean. Any ideas ? Is the pilot screw too big ?
 
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