devondumpling wrote:Is that 40 oil to 1 petrol?
In my humble opinion, most strimmers are TWO stroke therefore requiring a TWO STROKE OIL and Petrol mix.
Name the make and model of the strimmer and we can find the correct ratio however, my Husqvarna Brush Cutter (Strimmer) is a 50-1 mix the same as my Husqvarna Chainsaw.
A little extra oil won't hurt, it'll just make it smoke a little more, but I am of the opinion that a little more is better than a little less.
To get the right ratio, I went to that Chemist shop you have in Gen. Inzovo and bought a couple of plastic syringes (minus needles) so that I could draw up the correct amount from the Two Stroke Oil bottle.
I cannot at this moment tell you how to measure it accurately as I have it written down somewhere, but all of the mixing ratios can be found via Google.
Back to your sit-on Mower; as folk have suggested this might be Four Stroke and therefore DOES NOT require a Petrol to Oil mix although, there will be a separate oil reservoir which must be kept topped up with Four Stroke Oil.
You can buy Four Stroke Oil in any Lukoil or Shell type station, but the Two Stroke..... I usually get mine from the Husqvarna dealer in Karnobat, but for you, just up from BRE on the opposite side of the road is a shop that sells Strimmers, Chainsaws and accessories and they're sure to have it.
Are you planning to FLY around on this strimmer instead of sitting on your Mower!
Oh, and if using the former (strimmer), be very careful and wear safety glasses as a minimum. You'd be surprised just how they throw things up with the velocity of a bullet. I have a few dents in the caravan to prove the point.
Edit. Shown below is a link to a suitable site that you can enter your amount of fuel in Litres (if you scroll down past the Gallons part), enter your ratio of oil i.e. 25, 32 or 50 etc, and it will calculate how many millilitres of Two stroke oil you need to add. I used to mix up a litre in a clean and empty whiskey bottle and hence I used the syringe to get the correct measurements. Give it a shake before adding to the strimmer and even if the strimmer is left unused for a while, give the strimmer a shake to make sure the fuel/oil is mixed again.