Sea Doo went to the trouble of including holders for three spare spark plugs in the lid of the cargo compartment. Why did they do that? Who thinks it's necessary to carry spare plugs with them and why? Even the tool kit has a plug "wrench" (heaven forbid I should ever have to use it ). This all implies that it's not uncommon for plugs to go bad while on the water. Should I stow spare plugs on my rigs?