I would try Cosby's suggestion....easy first move.
By the way, tough little gearcase and if you hurt it there are lots of used ones out there. People burn up the power heads more often.
If you paid $30 bucks for 2 coils than I'm not sure what quality you bought.
I would finish dialing in the motor before I went fishing. Have you done a link and sync?
I have the 87 and it's slightly different. I have the low speed screw on the front and then they moved it to the side so I agree 89...90 all the same really.
Are you having any issues with it?
In Washington state no titles for motors either.
I agree motor is not running on all 3 cylinders. Check spark as well.
The carb number he wants is on this tag.
Yes, next time don't just order a part when you haven't tested what's wrong.
Swapping or testing coils, plug wires.....dirty connections, the list goes on.
Get a spark gap length tool. You can get an inexpensive single one for under $10
Check spark for a 3/8 jump with a good blue snap. Most likely bad spark or crap in the carb. Don't run it with high rpm's in a barrel or on muffs.