One small difference the old starter coil was rated 240V the new starter coil is rated 120V (same make and model) wired the new starter exactly the same as the old one.
Did you change the wiring so the 120 volt coil gets 120 or did you leave it as it was with 240 volts supplying a 120 volt coil.
If you have 240 supplying a 120 volt coil you bet it will..
Get Hot.
Smell bad.
Let smoke out.
Stop working.
