I just talked to our Motor Artisan and he said the Sp means it is specialized meaning somthing was done differently in the either the wire or how it was wound usually we only have these made for testing or by special request from some of our shops who have a specific need.
How did you aquire this motor?
TEAM ORION - AVIONICS - KYOSHO - KO PROPO - PEAK
"Racing is about the journey not the destination if it wasn't it would simply be called Arriving"
"The solution is people need to spend more of their efforts on promoting and finding more people to race with, rather then a personal quest to form a class that they can win at."