Need help, Open to suggestions

[Bondonutz]

Originally Posted by SpEEdyBL

One thing about the Tekin 1900 is that it is Y wound which means it is slightly more efficient than D wound motors and responds better to changes in timing. I stick with zero timing, but if I want a little more punch and rpm, i could just bump up the timing a little. You can't really do that with D wound motors.

Pardon my ignorance, Whats the diff between Y wound vs D wound.
Please explain ??