Agree on mess in Carb. Just draining it wont do once the damage is done. If it was sitting long I'd take the carb completely apart. Pay attention to the fuel jet its probably microscopic at that horsepower.
That said I would first, or once again check spark, make sure fuel is getting to the carb, make sure fuel is getting to the plug
. Try to flood it by pumping the line hard and over prime. Then pull the plug and make sure fuel is getting into the cylinder.
If the plug is dry and clean then its probably not getting through the carb. Kill switch is another obvious thing to check as welll as making sure its really in neutral. Maybe its still in gear
. My small merc was starting in gear
last week before we took it in.
are so small on these motors things get bent and wires get broke.
If you haven't already, dump your tank and try new gas. An expensive (3 or 4 beers) troubleshooting step I know but Its worth trying before taking the motor
to a mech.
Just saw most ideas have been brought up. Having the obm not start is so common my 12 year old knows all the steps.