... 1.Small spark. BOSCH 91115 BSX 184-185 2-BS 184-185 ,dynastart carbon brush,starter carbon brush ... 8661 004 320 1631 004 320 1640 001 107 401-404,406,407,410,411DW(R) 1.1KWMercedes ... never appears scratch, rough, ablation and so on. (2) With a good flow properties and set to change commutation ... original manufacturer's specification. Any more than a 2 degree variation in the setting can cause arcing, ...