i do mine at 40 to 1 runs fine no smoke
jonsered oil/gas mixture ratio is 50 to 1.
50:1 with Echo oil use 100ml of echo oil to 5 liters gas
50"1 with the proper oil
it's electric...there is no gas
40:1
50:1
50:1
50:1 with the appropriate two cycle oil.
most chainsaw gas/oil mixtures is 32/1
The perfect gas oil mixture for the jonsereds 49SP is 1:40 !
50:1
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.