marine oils have different detergents and corrosion modifiers for engines that have some water come in through the intake, and they are better aimed at keeping your plugs from fouling and your exhaust port from filling up, But they are made for engines that run for long periods of time at the same speeds. which is not ideal for your blaster, and I do not think that they provide adequate lubrication because marine engines are water cooled and dont get NEARLY as hot as ur air cooled blaster, and marine engines are no tuned as much as a stock blaster, so that makes them inherently more reliable.
So marine oil probably wont cut it in the long run!
My buds that race jet skis, they use synthetic or castor based motorcycle oil!