Sorry about that. Hadn't thought of a worn slipper pad.
With the taller gearing and larger engines, the HPI slipper requires frequent resurfacing or it glazes over, then slips so bad that it over heats and melts the spur.
Unless you run yours like I do which is pretty much locked down so it doesn't slip. Which kind of defeats the purpose of a slipper... and makes diffs/axles unhappy if you aren't really careful.
With the taller gearing and larger engines, the HPI slipper requires frequent resurfacing or it glazes over, then slips so bad that it over heats and melts the spur.
Unless you run yours like I do which is pretty much locked down so it doesn't slip. Which kind of defeats the purpose of a slipper... and makes diffs/axles unhappy if you aren't really careful.