Stihl part #4180 007 1061 for complete kit. the br 600 has the zama c1q 100a. Normally what fails in this carburetor is the accelerator pump. The o-rings swell and cause the pump to leak.the part # for the complete pump is stihl #1137 120 9704.They also fail due to throttle shaft wearing due to dust and debris and this allows the debris to enter the pump area and damage the orings and cause them to leak.The complete carb is part #4282 120 0604
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