1--Choke knob is installed upside down ??----2---Remove sparkplugs.----Put 6 drops of fuel in each hole.----Install sparkplugs.----Try and start it.-----Report the EXACT results of this test.
What are the actual compression values?-----Good numbers are around 135 / 140 PSI on those.----Poor hot start ?----Load test the battery and take starter apart for inspection / ohm check on armature.
For me the " bump " when it was running is a HUGE clue.----Then again " hope " is eternal.-----Go ahead and run it.-----Make sure you have oars and paddles handy.