New to me- 1984 jet boat .?

Question

What's the oil:gas mixture for a 140hp Mercury motor?

Also, it won't go in reverse. I bought it from a guy who said it just "quit going in reverse" and so he just never got in the position where reverse was needed. Took the cover off the motor and watched cables as it was put into reverse - nothing moved. Any help would be valuable at this point!

Answer 1

JET boat..??? sorry RochM...don't know of any JET BOATS

that have OUTBOARDS !!!!

in which case there shouldn't be any mixing going on, as this shouldn't be an outboard.

as for the reverse issue, i'd say there is a problem with the controls since there was no movement in the cables.

Answer 2

i am going to asume it is an two stroke outboard motor.  If so mix the gas either 40 or 50 to 1.   The reverse part could be the shifter cable is stretched and old.  If not i might be the linkage from where the cable goes into the motor to the lower unit where the actual gears are.