... 1.Small spark,low noise BOSCH 91109 BSX 166 4-BS 166,dynastart carbon brush,starter carbon brush,carbon ... not loose, falling off, broken off side, off angle, clamp and so on. 2. From the use of terms: ( ... change color carbon brush‘s body, no ablation. (4) During the running, It can make the surface of ... Pressure in Pounds/Brush = (Width x Thickness x 4 psi)Brush Holder Quartering:To insure that the best ...