The perfect gas oil mixture for the jonsereds 49SP is 1:40 !
25 : 1
jonsered oil/gas mixture ratio is 50 to 1.
25 to 1
it's electric...there is no gas
50-1 ratio most definitely.
50:1
40:1
50"1 with the proper oil
most chainsaw gas/oil mixtures is 32/1
50 to 1 is the best for all 2 cycles,
50:1 with the appropriate two cycle oil.
The best mixture ratio for this model is 50:1. You can also get away with 40:1.