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40:1 ratio is the norm, up to 50:1, you can get a 40:1 ratio mix by adding 2.5 cc of 2 stroke oil to 1 litre of petrol. Make sure you do not use car engine oil, it must be special 2 stroke oil which is what they sell for old lawn mowers and strimmers etc. If your exhuast is smoking then you put in too much oil so add more petrol...
You mix 2 stroke oil with the petrol/gas at a rate of 40:1 (40 parts petrol to 1 oil). For longer life use a good quality oil like Husqvarna or Stihl rather than the cheaper types you buy at car service stations.
The oil you use for the chain lubrication is just known as chain oil and can be bought at tool hire outlets.
use 25 mils of oil for every 1 litre of petrol you mix this is 40 :1
or on a 2 litre qty mix you would pour in 50 mils of oil in a clean petrol container 1st then add 2 litres of petrol only and give good shake then fill your saw
If your petrol has been sitting in the machine for a long time then yes it is your petrol. Mix a new batch usually you cannot let that sit around for more than 30 days, I always try to use fresh mixes, usually that means making smaller batches unless you use your trimmer quite a bit, most people do not though and that's when problems arise.
The fact that your engine turns over easily with the spark plug removed simply means that, with the plug removed, there is no compression, so the piston goes up and down very easily. If it has been a while since you ran the machine, and if you left gas in it, your carb may have gotten gummed up from the gas losing it viability and turning to something like varnish. You might try spraying carb cleaner into the carb (with the air filter removed), let it sit for a few minutes, then try starting. In the future, you probably should get some fuel stablizer (available at almost any hardware store) and add it to the fuel that you use for your small machines. It will keep the gas viable for a much longer period of time. Hope that you are lucky enough that the carb cleaner, a good dose, will work. If not, you may have to disassemble and clean out your carb. (if you've never done that, a series of digital camera photos so you know where to put things back is a good idea).
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