Super H cold weather starting problem

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?

Greg

How long has it been since you added fresh gasoline? Unless you have add some that was purchased this fall you will have either a summer blend of at least fuel that has the light ends evaporated off. You don't have to replace all the fuel. Even adding 10 percent new fuel can make a big difference in cold weather starting.

Winter and summer grades of fuel are different in areas that have different seasons. Places like southern california don't vary a smuch but place that get hot and cold have different volatilities becasue Gasoline is not as volatile in cold temperatures. If you have summer fuel in it, try adding some fresh stuff and see how that does.

Since you grew up with that tractor, you probably already know the trick of getting the engine spinning over before you pull back on the choke and then using that choke sparingly.

I agree with the others, put in some fresh gas and see what happens. I live in southwest Iowa. E-10 is all I use and my 1950 H starts and runs just fine in zero temps and below.

Gas is as fresh as it gets. Added about 5 gallons last week, and previous fill was this past fall.