Hi, Im having problems with one of my king tigers its never previously had issues running on grass but recently It refuses to perform neutral turns with one track locked, the motors just stall out. This tank uses impact 3:1 boxes and kenny kong metal tracks. Ive tried using different sets of motors (all broken in) and not luck. Strangly my other KT with uses impact metal tracks and gear boxes runs just fine on the grass! If anyone has any ideas Id be greatful!