Original Posted By: "MICHAEL SILVIUS"
Hi Folks,On the recent posts on hard starting, I've found that the old Stromberg NAS-3 needsit's idle mixture richened up about 1/4 to 1/2 turn in the cold weather.I had overhauled the carb as per the manual, installed the steel needle, andset the float level by the book last summer. Ran great, plugs were perfect, idlemixture screw was at about 1 turn (set for best hot idle, like the book says).Pull thru 4-5 blades, switch on, crack the throttle, and she'd pop right offand idle, although a little rough until it warmed up. Now that it's cold (well, as cold as it gets around here), she'll pop right off,run for 4-5 seconds, and die. This would be repeated a couple of times untilshe would finally stay running (carb heat on). Opened up the idle mixture 1/4 turn or so yesterday and it's about 90% better.Still died once, but stayed running on the second attempt. My old BMW motorcycle needs seasonal idle mixture tweaks, and so did the old Porsche,so I suppose this is to be expected with a simple carb with no manifoldheat.My 2 cent's worth :-)Dave MordecaiPanacea, FLHi Folks,On the recent posts on hard starting, I've found that the old Stromberg NAS-3 needsit's idle mixture richened up about 1/4 to 1/2 turn in the cold weather.I had overhauled the carb as per the manual, installed the steel needle, and setthe float level by the booklast summer.Ran great, plugs were perfect, idlemixture screw was at about 1turn (set for best hot idle, like the book says).Pull thru 4-5 blades, switch on, crack the throttle, and she'd pop right off andidle, although a little rough until it warmed up. Now that it's cold (well, as cold as it gets around here), she'll pop right off,run for 4-5 seconds, and die. This would be repeated a couple of times untilshe would finally stay running (carb heat on). Opened up the idle mixture 1/4 turn or so yesterday and it's about 90% better.Still died once, but stayed running on the second attempt. My old BMW motorcycle needs seasonal idle mixture tweaks, and so did the old Porsche,so I suppose this is to be expected with a simple carb with no manifoldheat.My 2 cent's worth :-)Dave MordecaiPanacea, FL________________________________________________________________________________