On Wed, 1 Aug 2012 06:36:24 -0700 (PDT), "hr(bob) email@example.com"
I have a 4-cycle Troy Bilt trimmer with interchangeable heads (edger, blower,
etc.). Not the best brand but it works quite well. It has a (variable)
throttle trigger but I always use it full bore. Not sure why you'd want to
slow a string trimmer down.
Mostly 2 cycle, but there are 4 cycle unit out there. I bought a Ryobi
(don't know who actually made it) unit on wheels. It was only $100
(refurb) but is a great unit. It has a 4 cycle engine and a
throttle/clutch on the handle. When you squeeze a little the string
head starts to turn. Squeeze more, and it revs up the engine. Very
quiet compared to my 2 cycle, hand held Homelite.
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