http://www.ebay.co.uk/itm/BRAND-NEW-18V ... 2111wt_922

will warn ya, they are a bit hit and miss. as i said before, one of the motors keeps sparking whilst the other 3 don't. I'm going to try turning the frequency down on the ESC but other than that, its going to need a new motor. out of the original 4 i bought, two needed replacing straight away.