Re: 1939 Champion S1E and D1E 1 cylinder motors.

[hotrod]

As far as production goes, they made 3,037 D1E motors and 7,912 S1E motors.
Opinion: Although they made fewer D1E motors, they may have a better survivor rate since they were more expensive and presumably purchased by buyers with a bigger pocketbook who may have taken better care of them (?).
Today, value may depend more on condition than model number.
Opinion: Desirability by todays collector might favor the D1E since it has Deluxe parts for more interest such as top shroud & synchronized mag/carb controls.
There were several versions/running changes of these 2 models: S1E mags were mostly Eisemann but a few later ones had Wico. Crankcases were different for those 2 mag types. Some later S1E motors had the new style 1939 lower unit. D1E motors used 2 styles of hood/tank (4 screw mounts on early motors and 2 screws on late motors). Later D1E motors used the new style 1939 lower unit and new style steering handle.