RE: quadra q52 sparkplug gap
Set plug gap to .025", magneto gap to .015 ( the thickness of a business card) I'm assuming it is a magneto and not electronic ignition. Prop size is ok...20/10, 22/8. There is no "carb spec". Start at 1-1/2 turns on each and tune richer or leaner to suit. When you say it misses, will it rev up or just sound "flat". If it's too rich it will sound "burbly". Make sure plug wire cap is securely on the plug.