The lean condition can come from several places. Usually there are other symptoms to lead you to the lean-ness (decel pop, hanging idle), but not always.
- header crush washer
- mid pipe junction
- air boots
- air jet at intake bell is too large or loose
- un-oiled air cleaner
- un-packed silencer
- wrong jet needle (try NCVS or JD Red at 0-3000 ft)
- damaged fuel screw (the tip can break off or bend)
- exhaust valves out of spec
You can also just take the spring on the fuel screw and 'stretch' it so the fuel screw is tighter, and will no longer want to fall out.
Beyond that, I would be stumped. I would say go with the 52 pilot and try and dial that in.
Edited by Krannie, March 22, 2013 - 04:56 AM.