Posted by cisgww on December 19, 2009 at 12:29:10 from (71.10.81.89):
Inherited a Super H #21894J I grew up with.
New wiring harness, 12v neg system with 6v starter, new coil and ignition parts, rebuilt carb. Have hotter D21 Champion plugs in it gapped at .028. Fresh oil and coolant/antifreeze. Turns over with no problem.
Starts fine with no or little throttle and runs well in warmer temps. Under about 40 degrees, doesn"t start worth a darn. The only way it starts like a champ in cold weather is if I warm the carb with a heat gun for 5-10 minutes. It then starts with a few cranks and some choke. In only a few minutes, I can add throttle with no problem, even faster than when starting in warmer temps.
Tried wrapping the carb with heat tape but that didn"t help at all, wasn"t hot enough. Don"t think a block heater or "tank" heater would improve cold starting. as it turns over fine and wouldn"t heat the carburetor and fuel system.
It all seems to be poor atomization of the fuel when carb is cold. In MN all gas has 10% ethanol.
Any suggestions, or just contunue to preheat the carb? Without preheating carb, it just floods out.
If I do add a block heater, where can I get a replacement for the original style block heater that goes down throught the head into the water jacket on the left side of the engine?
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