I am attempting to repair a BR700 backpack blower for a friend. My friend brought it to me saying he had it looked at by a local Stihl dealer..who told him it was tied up and needing major engine repair. I removed the spark plug and put an oz. of ATF and a little gas in the spark plug hole…worked the crank back and forth a few degrees at a time, and it came loose. I reassembled it and it started and ran. It re-starts.
What I am experiencing is a situation where it will run for 5 minutes at full throttle and then it will seem to lose power. It runs so good for the 5 mins. it’s hard to believe that t there is an internal engine problems. I have not removed and or cleaned the carburetor, but I have tried to adjust the low and high speed needles and I just don’t seem to be able get it adjusted to rev fmsmoothly or so