LSN inthe Slide. The MRN is shown on photo. Is mostly for a more experience person to adjust. If you set up as one turn out from flush, your slide will be closed to 1mm or less for air gap. Probably idle speed will be lower. With patience and time you can make it idle like a Harley. Try and post a photo of your air gap. I have problem with posting Photos. may ask for your email addy, if you dont mind, I'll leave mine on your PM's on RCTech.