1988 70 HP ( 70etlg ) Wont crank / turnover

[mattzmojo]

Hello All,
This motor is new to me and I am fairly new to these motors. I am not sure where to start since I don't have a manual other than the manual that spans a bunch of motors.

I am not sure if this is related but I looked at the 10 pin power bundle and noticed that the yellow wire has been cut on the motor side portion of the bundle. Should I be concerned about this or is this simply a wire that is not used on this model motor?

When I hooked up the battery to the motor, I get a click for the trim motor(up) but nothing down. When I turn the key, I get nothing no click no starter.

Does anyone have any wiring diagrams for this motor they wouldn't mind sharing along with any suggestions?

Thanks,

[ausnoelm]

Do the VERY easy stuff first... is the battery DEFINATELY good? is the gear/throttle lever in neutral? remove and clean the battery terminals, even if they look OK, do those simple things, then get back to us and we can try a simple voltage drop test next.

[robert graham]

Do the VERY easy stuff first... is the battery DEFINATELY good? is the gear/throttle lever in neutral? remove and clean the battery terminals, even if they look OK, do those simple things, then get back to us and we can try a simple voltage drop test next.

My 2nd on this....is your emergency cut-off tab in place?....remove/clean/grease/tighten heavy wire connections on side of starter.....

[mattzmojo]

Thanks for your suggestions. I cleaned up all of the connections and as you said, even though they looked good, they were brittle. It now cranks but wont start. I checked spark and it seems to have a good spark so i know its fuel.

My primer bulb does not seem to be tight when I pump it so I am thinking that could be an issue.

My other concern is this is a new motor to me and I am used to mixing my own oil. How does one test the oil injection system? Does anyone have a good procedure?

[rodbolt17]

easiest way is run the next six gallons on a 50/1 premix AFTER carefully marking the oil tank level.
it should consume 1 pint in six gallons.
if it does,run it.