On Tue, 17 Mar 2015 08:24:27 +0000, Tim+ wrote:

Power to weight ratio probably rules out four-stroke engines for
strimmers although I'd be happy to be proved wrong.

Not to mention that 4 strokes generally have oil sumps and don't like
being operated at any angle. Two srokes with oil in fuel aren't
bothered aboout orientation which for a strimmer can be very
variable.

Something doesn't add up between "changing oil", "strimmer" and "4
stroke".

--
Cheers
Dave.