Got a50hp evinrude lark and it will not start but has spark

Check batt leads are not switched pos to neg,or obviously you have a short somewhere.make sure fuse is twenty amps

first, do not use the spark plugs to test for spark. They could be fouled. (another lesson) use new plugs or a spark tester, This a HOT (powerful) ignition system so be careful. Test for spark. No then, find the black wire with the yellow tracer is the ignition kill circuit, (or it was, should still be) I would disconnect it from the ignition switch and test for spark. Do not touch this wire during or after testing, it will hurt. if you have spark, ground the wire back to the terminal to discharge. You probably have a bad key switch. more if this does not work

Sounds like dirt in carbs

Dirt in carbs or filters

If you mean PROPELLER you tighten that nut till it stops and then back it off to the first cotter pin hole. There is not specification for tightening the nut.

The 70s Johnson or Evinrude outboards of similar sizes did not have any charging system. I had an old Johnson 50HP (key injection) mounted on an 18Ft Zodiac and I needed to remove and recharge the battery once every couple of weeks. Keep the battery dry and the contacts well greased.

I the metal rod to pull out on the starboard side.

Thanks

how can I adjust the shifting linkage on my 50hp evinrude. I have the cable adjusted all the way out but it will not go into reverse