I am new to 4wd electric buggies and I just built this one yesterday. When I give it power on the track the slipper clutch just slips so much the car barely moves. If I have it off of the ground the wheels move fast. I have tried to tighten the slipper as tight as I can but it does not seem to help. What am I missing? I have a castle 5700 KV brushless with a 19T pinion and the largest spur that the car came with. Any help would be great.