Too cold to start car

It cranks fine. Starter, battery, plugs, wires are all about 1 year old. Engine was put in last fall. It'll make a puff or two but not enough to keep it going. Usually in the past, I'd just pump it twice then turn over while feathering it. I've been meaning to bring the battery inside and put on the trickle charger, I have another battery I keep on it at the moment.

So the main consensus here is I need a choke.

That might be the same kit I bought before, but after replacing the main body with what I thought was a 4150, the side is just slightly different enough that while the parts bolt on correctly, the little metal squiggly piece connecting the choke to the linkage won't fit properly.

so you have a choke, but its not connected? That's probably your problem. If it is designed to run with a choke, manual or otherwise, its probably compounding the issue. Get your choke linkage fixed and try again.