HI do set the high end first pinch method is good thereto set the low endcome up a few hundred rpms from idle ( 500-1000 )-turn the low end in until the engine starts to run a bit roughback out the needle valve until the engine noticable starts to run very smooth-the low end is SETnow set your idle speed based on the wind conditionsidle speed should fly the plane on to the runway- before a days flying i always check my high end RPM on a tachto be sure i have not developed an air leak of some kind and all is as it should be-a loose headhole in the fuel line-carb base loose fuel tank leak will cause an air leakan air leak if not detected will lean you out-cause excessive heat and render you dead stik-and burn out the glo plugdead stick is alway a safety hazard-and an unpleasent situation to have to deal withso be sure to have your engine is set up before take off -any sudden increase in your RPMSor your needle valve needing a new adjustmentwhen it always ran at a certain place -is a sign air is getting into your engine-should be investigated and corrected before taking to the air again based on 25 years of handling glo engines-ENJOY REGARDS TONY " the omega man " think pink