... 1.Small spark,safe BOSCH 91111 BSX 172-173 2-BS 172-173 ,dynastart carbon brush,starter carbon brush ... 004 320 2442 004 320 2450 001 416 063-66,68-780 001 417 056-072,KB(R)5 ... never appears scratch, rough, ablation and so on. (2) With a good flow properties and set to change commutation ... the original manufacturer's specification. Any more than a 2 degree variation in the setting can cause arcing, bar ...