I'd almost be willing to bet my paycheck that what you're hearing is nothing more than your engine hitting the rev limiter. It just sounds different in a 4-mix.
You have to have it adjusted perfectly to you. Mine are adjusted that when I'm using it, both my arms are all the way down. The only fatigue is my grip strength.
When you're trimming and there's windows 2 ft off the ground, or you're trimming around vehicles, you definitely don't want to run that thing wide open.
I had one of the first 90R trimmers that came out. I didn't like that it was either idling or wide open. There was really no in between. It was also heavier than an equivalent 2-stroke. I later got a FS11RX and it had more throttle control but I still don't like the 4-mix. I'm glad you do like...
I tried out this line yesterday and I really like it. It cuts like a pair of scissors and is totally quiet when it's swinging through the air. It's x-shaped but twisted.
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