20 years ago I installed one of those oversized westcoast gas tanks in a 550. You had to fill it at the tank. was not thinking and poured gas in through the gas cap. realized what i had done. Turned hull upside down to drain out gas. Went to put in water and battery was dead. No big deal, jump it off my X2 that was on the trailer. Jumper cables slipped of and Boom........ Uh, did not get all the gas out of the hull. I realized this as I flew though the air backwards landing in the water.
6 years ago had rubber dampner blow out. Called a buddy and drove 2 hours round trip to get another one. Come back, pull the motor (It was 11:00 pm at this point Memorial day weekend). Go to bed and get up early to put everything back in. Walk out to the shop, look at the motor sitting on the bench and started wondering why in the hell did I pull the motor, all I had to do was loosen the four motor mounts and shift the motor forward.............. dumb ass........
Funny, I almost did something similar.
I installed a gravity feed drag fuel cell in my modified SN that runs the fuel lines tight to the flywheel cover and underneath the rideplate. When my strap mounts broke and the tank shifted freely, I decided to live the motto "F~ck it" and found myself 20 feet from the dock bogging my way in... Opened the hood to find 3 gallons of gas unloading into my hull, a floating Ballistics battery, and my Dual one-way water dump valves unloading the gas into the water surrounding the boat launch. My hands were shaking and my adrenaline was out the roof while unhooking the battery... Made it out alive though.
2)
Big-bored, ported, piped, dual carb'd and dual cooled a 550 piston-port engine... No water restrictor to the pipe, never worked but couldn't figure out why... Clogged the cooling lines with sand (unknowingly) and she ran like a bat out of hell for 30 seconds into the middle of the lake. And then I swam that beautiful door-stop all the way back in... I came to find out later the carbs were different sizes as well (38mm & 40mm).
3)
Bought a 'broken-but-fixable' Polaris 780 ski from a machinist who's worked on skis his whole life. NEVER got it to work.
4)
Painted gel-coat on with no thinner and used a brush. I assumed it was like painting a house, SUPER ROOKIE mistake. Sanding it all off after was a total b!tch...
I have many more...
-Gringo