Here is the English translation of my blog:
As I have pus to see it, the engines brushless cannot be assembled on L E4 WITHOUT MODIFICATION of the frame and the cells because of the tète larger than the engines brushed
The 1ere stage consists in cutting out the exchange part of the frame or come to place the engine, that allows a better cooling, and as the tète is slightly longer on the brushless it touches against the frame, therefore will be necessary to file 1mm the frame or the tète come to touch, so that the tete returns perfectly in are housing
Being gives that to put the engine in are housing it is necessary to remove the cell and the support of belt tightener!!!
Once the engine goes up without correction of the cells, the engine almost does not move in are housing and impossible to regulate L between teeth correctly and to mount too large pinion of A the cylindrical tète of the engine which touches between the cell and the support of belt tightener
The 2nd stage consists with a dremel to come to sandpaper and decrease the matter of the cells in order to be able to remove and put the engine without having to remove the cell and to thus be able to correctly regulate L between tooth of the pinion