I have a sears 3.5 obm there is no model # or serial # i looked behind the carb & there is no <br /> engine# everything is gone.<br /> it,s olive green in color,air cooled,<br /> and down by the prop there is a tube that takes the water to the leg.<br /> what i would like to know is the fuel ratio,<br /> do i use chain saw oil,and close to the year if possible. i got the motor a month ago,it starts <br /> but i want to be sure of the fuel ratio.<br /> need help. thanks charlie.
