2 stroke mix ratio for a string trimmer

[ryan.s]

What is the 2 stroke oil/fuel mix ratio for a standard 25cc gas string trimmer? My chainsaw uses a 50:1 mix ratio and was wondering if string trimmers for the most part are the same.

Thanks.

[Joe Lyddon]

My Ryobi 31cc string trimmer uses a 32:1 mixture...

Does that help?

[ryan.s]

Thanks, that does help. The reason I ask is I was at HD earlier today looking for gas string trimmers and noticed that the 2 stroke oil next to the trimmers were smaller in size than the oil they had near the chainsaws. Made me wonder if the mix ratio is different, if so then I would need to buy another can for the string trimmer.

[LCHIEN]

Thanks, that does help. The reason I ask is I was at HD earlier today looking for gas string trimmers and noticed that the 2 stroke oil next to the trimmers were smaller in size than the oil they had near the chainsaws. Made me wonder if the mix ratio is different, if so then I would need to buy another can for the string trimmer.

just for fun i did a quick search on google (2 stroke oil ratio)
and there are mixes of as low as 20:1 and as high as 50:1 mentioned as recommended by manufacturers in various tool and small engine forums.

I think the best thing is to find the manual and follow the manufacturer recommendation. too little oil (bigger ratio) will result in premature wear and engine failure
and too much oil (lower ratio) will result in fouled spark plugs. Generally too much oil is preferable (easier and cheaper to fix by cleaning) so if you can't find it, try 30:1 or so for your string trimmer.

Those people with multiple 2-cycle tools, to avoid several different cans with different mixes, say they use the lowest fuel/oil mix so as to over-oil rather than risk under-oiling some tools. E.g. lawnmower want 40:1, trimmer wants 32:1, chainsaw wants 50:1, then you should use 32:1 as your mix if you are only going to have one can of premixed 2-stroke fuel.

[maxparot]

It depends on the motor and the oil. Follow the manufacturers recommendations carefully.

[Stick]

Those people with multiple 2-cycle tools, to avoid several different cans with different mixes, say they use the lowest fuel/oil mix so as to over-oil rather than risk under-oiling some tools. E.g. lawnmower want 40:1, trimmer wants 32:1, chainsaw wants 50:1, then you should use 32:1 as your mix if you are only going to have one can of premixed 2-stroke fuel.

That's pretty much what i do. On the farm I've got lots of small engines. One chainsaw runs 16:1, but it has zero safety features so I am the only one to use it, and I keep it locked away. Two other chainsaws and a weed whacker are 32:1, one snowmobile 40:1, 3 snowmobiles 50:1. I leave one gas can with 32:1 and just tell the wife to use that in everything. When I'm home I use the right mix for each.

Four stroke small engines all get 30W oil, so do the tractors in the summer. Tractors run 0W40 in winter. Compressors run that year round. Big trucks all run 15W40 year round.

Oils are a nightmare when you have multiple engines with multiple operators. best thing is to try to standardize where you can.

[ryan.s]

Thanks for the tips guys. I tried downloading the manuals of some of the string trimmers that I was planning to buy but none of the them mentioned the mix ratio. My attempt was to find one that was similar to the chainsaw but it looks like that won't be possible. I'll try the recommendations of using the lowest mix ration (over oil) on the chainsaw since I won't be using it as much as the string trimmer.

[parnelli]

Thanks for the tips guys. I tried downloading the manuals of some of the string trimmers that I was planning to buy but none of the them mentioned the mix ratio. My attempt was to find one that was similar to the chainsaw but it looks like that won't be possible. I'll try the recommendations of using the lowest mix ration (over oil) on the chainsaw since I won't be using it as much as the string trimmer.

It's usually written on the gas cap.