Hi Redeye,
I know the motor at least

It is a Kirby Tecumseh two stroke of which there are several models... If you have a look on the engine bottom crankcase bolt there should be either an alloy tag at right angles or a coloured plate across the bottom with the engine details.
I suspect this one will have the tag and it may well be a KAH 74 on it.

The other models which look the same are KAH7, KAH9, KAH11 (although I have not see this one in a round finned barrel configuration, stand to be corrected there

) and KAH87.
I dont know who made the line trimmer itself though, looks like a similar layout as vccomm's villiers powered one.
