The ooze coming from the exhaust would
seem to indicate to much fuel. When a motor
wont start take out the plug an check to see if
it is wet. If it is shake out the fuel or better yet
blow it dry with air. Spin the motor over a
dozen times or more with the plug out. Then
put the plug back in and with the mixture screw
closed all the way try to start the motor so it
can clean itself out. To start a motor by bouncing
it off compression you need to have the spark plug
firing after TDC. As you spin the motor
backwards the plug fires before the piston reaches
TDC causing the motor to reverse direction and
take off going forward. When your spinning it
backwards the point that you releasing the knob
is where you want the plug to fire.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.