just picked up a 1991 a.c.lynx for my daughter to learn on...got it cheap but its been messed with quite a bit..does anyone have the carb.specs.for this unit...air screw setting etc. can' t get it to stay running....it sat for about 4 years put a new fuel pump on...disassembled the carb for cleaning and just want to set it back to factory specs.as a starting point. thanks