Didn't use wheel weights, but I did put some larger wheels on it than what was called for, so that did help a little but was not far enough forward to do the job. Thanks to all of you for your ideas and comments. I have added the necessary weight by attaching it to the bottom of the engine mount. I took an old iron railroad spike and cut and ground it to the weight I needed, drilled it and screwed it to the MM. Now I'll go to fly it and probably spike the damn thing!