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Most outboards have a manual release screw on side of motor.wide impact driver may be needed,then pull up manually and lock
low speed jets were mentioned,crud builds up in them,sometimes cleaner,solvents are not enough,try a copper wire in there.A lean running engine can cause
followed by spark test,lincnsync,fuel system diagnosis.
Before firing engine clean plugs inspect fuel lines,looking for the obvious,loose connections on connectors, wiring in general,might have to pull carbs
I highly recommend, if you are getting into things like valve clearances, timing marks, etc that you purchase a Honda Shop Manual.