On 12/06/2017 15:37, Al-W wrote:
Hi,
I've acquired an Echo SRM-2010 strimmer / trimmer, and would like to know what fuel to put in it.

Someone on YouTube has a video of servicing an Echo GT-2100 which has what appears to be the same engine, and he hazards a guess at using what he describes as "50:1".

What does this mean? Is it 50 petrol to 1 of something else? I cannot find a user manual for the SRM-2010, even at the main Echo website!

Many thanks,
Al-W

I don't know this particular machine but 50 to 1 is a quite normal mix
for 2 stroke engines. It means 50 parts petrol to 1 part 2 stroke oil.
You can buy a mixing bottle to make life easier mixing a tank full.

Look up 2 stroke engine cycle on Google for a better understanding of
what is going on.

Mike