Originally Posted by
RSM-Gazza
Ps, if that BR700 close by doesn't sound perfect and run perfect or has a clangy noise or whatever be suspect of it.
As the only problem would be the operator having a brain fade and using straight fuel.
My BR 600 ran almost fine, not totally right - but usuable for a month after the damaging straight fuel event. I had the Stihl dealer check it and they put a camera in the bore and saw the scored cylinder lining and showed me.
I took the BR 600 home in pieces from the dealer, the next day I reassembled it and sprayed WD 40 down the cylinder via spark plug hole and it worked fine initially for 2 weeks then got worse and failed after a month. If I was dodging I could have sold it immediately.