Sorry about that smoke thing.I'm told they run on smoke and if you let it out it DON"T WORK NO MORE I have the hardest time understanding that but oh well.As for my MRC I had it working but the adapter for the rear wheels acts somewhat like a plow.The front unit also tries to climb the rear unit when in reverse and turning at the same time.I'm sure I can work it out.The front drive motor screams pretty bad,What type of lube do you use?You bugger you got me started on this MRC and I don"t have time for my hellis or any thing else.Thank rusted rc I really enjoy tinkering with this stuff.Later Smoke trail Charlie.