1. I started a fresh motor, was reving it up without the airfilters on and a chinpad screw I hadnt fully tightened dropped into the carb. Piston and dome head damage
2. taking carbs off and hit positive post with corner of carb, caught carbs and ski on fire. Luckily minimal damage
3. hooked up a msd enhanser wrong, backfired and blew the bpipe chamber off, ripping the new coupler.
funniest thing I saw someone else do (mossman) He just put his motor in and was either in such a hurry to get to lake or had some other influence, that he forgot to put gas tank in. He got suspious when his ski took a whole 5 gallon gas can. He lifted the hood and his motor was swimming in gasoline.
You forgot the main one > Promoting WDK products