Could not get on plane

[BuilderFL]

I checked compression and I have 4 cylinders at 116 and 2 at 120, so we're good there. I took out the sound box and sprayed a can of carburetor and choke cleaner on all three. The timing advance arm moves freely and I would like to check the ignition timing adjustment, but I have misplaced my manual and don’t remember the setting or procedure for this Merc 200hp.