Having issues with a BG86 and a RS100RX. The 86 sounds like its knocking some times and your not suppose to flood one but I think my help did, now it wont come to full speed. One of my new 100RX's is a ***** to start I mean you just want to poke a ice pick in your ear. Both back at the shop. No its not the gas because all the other new stuff and old Echo trimmers are running fine. The knocking issue on the 86 is only when you rev it up just sounds like it has 15.1 comp.