ORIGINAL: heavyaslead
The 540's are the standard RS series Mabuchi motors, avoid the high performance kind as they are tuned for single direction rotation (forward) where the Leo need forward and reverse with equal tuning performance.
You can upgrade easily within the same can size and shaft diameter without re-work.
Thanks heavy, where can I find motors that are higher performance with the same can size? When you say "avoid the high performance kind" do you mean modified stock 27 turn motors like Trinity etc.