Jerry,

I had a stock KV1 and tried to upgrade it using Mato metal tracks and sprockets. I had the same issue. I tried several different tracks and sprockets (working with my local clubbie Phil Phfleuger) and we tried HL, Mato and Tamiya sprockets, but just couldn't get the Mato tracks to work. I eventually put the stock Tamiya plastic tracks/sprockets back on and it works fine. Sorry this is no help, but at least maybe you don't feel like a one-off here.

Jeff