The moment you said "tecumseh" I stopped worrying.
You can buy pulleys in any flavor, shape, diameter (ID and OD) you want these days.
For the future, with a cast pulley like that, I've had good luck with a jaw puller, a torch, and a planishing bit in an air hammer. Skip the penetrating oil and use a taper candle.
Here's what you do.
1- install the jaw puller and put some torque on it. Not enough to snap things (oops too late :)). You just want positive pressure. At this point you're not trying to pull it off with the jaws, just putting pressure on it so it will move if it breaks loose.
2- start heating the pulley. Propane works but it's slow. MAPP is better, but acetylene is quickest.
3- stick the candle in the center hole periodically to test the temp. Once you get melting, keep going a bit. If you get a wee whisp of smoke, perfect. If you get sizzling and a lot of smoke, you went too far. If you get flames, way too far. Once you get a bit of wax melted in with a wee whisp of smoke...
4- Turn off the torch and set it down. That 5-10 seconds is perfect to let the wax wick into the spaces. Give one more little turn on the jaw puller. If it moves, you're golden. If it doesn't move, hit the shank with the planishing bit on you air hammer. Do not have your face in front of the pulley. Ask me how I know. I did this with a John Deere G flywheel which is a chunk of cast iron about 28" in diameter and about 100 lbs. I got to the air hammer part and that flywheel popped off in my face. No damage to me or the flywheel, just had to change my underwear.
The problem with using penetrating oil with heat is that the oil burns off before you get enough heat to properly expand the pulley. Wax has a higher burn point that more closely matches the temps you need to get a good expansion on the part.
well new pulley on new motor. Little slack, but that was there on the old setup.
