1.) I run the 8x1.3's, but I know that a lot of people were crazy about the 6x1.5's, and now they are going for the 4x1.8's.... So, track conditions and driving style should determine further decisions..

2.) I run 55(losi) Front 50(losi) Rear

3.) Yellow up front, Orange rear

4.) Dont know.. Never calculated it out, but most common motor for this truggy is the 2000kv or 2050kv

I hope this helps. Granted, these are just what I run, and different people will run different things.. Best choice would be to just take a practice day, and try different setups, but only do one thing at a time, and make a note of the different affects each change makes. Also, make large adjustments. (i.e change oil from 35 to 50, vice or versa so that you can know without a doubt what that is doing. Then do your fine tuning later (2.5 oil changes))

Good luck!