well i hope u have fun with it id probably say just start with a 10.5 motor as most back yard tracks are blown out or atleast lomey and u will be looking for traction. you may want to run rear motor setup as well. i never seen your tracks bt those are my thoughts. also get the rear aluminum rear suspension hangers and fill the empty ball stud holes in with set screws.around front and rear camber link position. just helps strengthen the plastic