Over here we mostly run on gras and astroturf tracks, very similar to your typical UK track. Most of us use the 3* motor in 2WD, although this can be a very hot setup when it becomes slippery (rain, the occasional clay track). For general purpose in 2WD, I would say a 2* would be fine. A 4* is waaaaaaay to hot in a 2WD. Some tried a 4* and ended up running 5 cells.
I use a 16t or 17t on the stock spur depending on the track length.
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