Modern engines do bugger all if in gear and you turn the key!!
Re. the Otter thing, there was a boat next to us on the mooring on Sunday, I thought it had a similar name! It had a yam 70 2 stroke that wouldn't start and he had the plugs out etc etc!!! Think my brain was frozen!!!
Have you tried some easy start in to the air intake??
If the wiring for the kill cord thinks it is missing due to a wiring fault it won't start.
I leave my fuel for months without use in plastic yam tanks. With breather closed, never had an issue, use a double dose of Redex once a year.
Rob