05 9.9 4 stroke spark problems

I'm new so be nice. i have this barn find motor that had a rats nest in it. i cleaned it all up and reconnected all the chewed wires. It fired right up and i was totally surprised. However a few weeks later sitting on it's back (I know now that's not right) it would not start. Maybe a few hits when using start fluid. The spark seems very week. I replaced the coil with a used one. I replaced the CDI with a new one no difference. i am retired and rebuild johnson/evinrude 9.9 and 15 hp 2 strokes with my eyes closed. But this ones got me. Any suggestions?

Yamaha's traditionally have a weak spark,is it getting fuel? Layed up for that long I find it hard to believe the carb doesn't need cleaning

Have you ohmed out the coil