hello, im helping a friend work on an outboard its a sea-king 3.5 model#vwb19068b serial#56x10511. we have the motor running but not sure of the oil ratio? 24:1 is what were using. also does this motor have a water cooling impeller in the lower unit? we are not sure if this thing should be pumping water out a port someware? any info would be a great help such as year made and the proper fuel to oil ratio. any tips on tuning would be great to we have to adjust the rich lean knob to throttle up or down to run smooth. is this normal? thanks, tom