Ok, I thought I had this thing fixed, and it worked fine for a while. Now, When I pull the throttle, it works fine when going forward, but when I throw it into reverse, it arcs like mad while the throttle applied. I dont know whats happening. And also, I pull the throttle and hold it for about 20 seconds, and I can see carbon already building up on the comm. After a run, the comm is black, but the residue comes off easily. Whats going on here? I am clueless once again.
Thanks for any help.