Go 50:1.
25to1
50:1
The proper fuel mix for all Husqvarna two cycle engines is 50:1 or 2.6 oz of oil per gallon of unleaded 89 octane or higher gasoline.
The mix ratio is 50:1, but be sure to use a good 2 cycle oil such as Husqvarna's or Echo's. Do use a motor boat or motorcycle 2 cycle oil. Those are not rated for the small engines like used in the 141 chainsaw. Best bet is to buy the oil at a reliable mower shop.
25 : 1
50/1
The 450 SX is a single cylinder 4 stroke, so no you do not mix gas.
jonsered oil/gas mixture ratio is 50 to 1.
The perfect gas oil mixture for the jonsereds 49SP is 1:40 !
50 to 1 2.6 oz oil to 1 gal. gas
1/2 pint oil each gallon of gas.
If you use gasoline with no oil mix the engine will not get any lubrication and will overheat and lock up.