Base setting for TT46Pro is about 2.5 turns out for the HSN and about 1.5 turns out for the LSN (carb must be closed), its a base only and gets you to a better start for tuning. If your engine cuts abruptly when you throttle up then the low end is probaby too lean. Another easy way to test for LSN is to let her run on idle then do the pinch test, pinch the fuel tubing and see how the engine quits. If it picks up by a fair before quitting bit then its too rich, if it drops RPMs before it quits then its too lean.