by KE4AVB » Thu Sep 21, 2017 5:55 am
Of the 4 cycle handhelds they have been the most reliable ones mainly because they use 2 cycle fuel mix and can operate at various angles without oil starvation unlike those Ryobi and Troybilt 4 cycle units that I keep getting with destroyed engines due to lack of oiling.
I haven't used one enough to say much about using it at variable speeds long term just when I testing a repair but I haven't seen problems as I tend to part throttle around young trees and vinyl siding and underpinning. I do know several of my customers are using them. Some didn't even know their FS90s were 4 cycle until I listed adjusted valves on the repair order.
On the subject of adjustment they take a very narrow width feeler gauge as rocker arms are folded over the valve stems. Something on the order 7/64". or just their valve service kit that includes the gauge.
.004 IN and EX. Valve clearance
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