the gear went fine took me about three hours to get it all put on did not change the c.g. any i like it alot better on the fuse then the wings. as far as what im using to tune the engine i broke it in per the instructions and as far as it running rich and what im using to tell maybe im wrong but i run the needle valve to its proper setting then listen to the change in rpm where it drops then back off 1/4 turn, then i have alittle smoke coming out of exhaust, and more excess fuel on the plane then normal. i was just trying to find out why the engine was getting so much discoloration.