Twin-engined jet boat with (Rotax) 717's with oil injection (vs. pre-mix)
Have done own work on automotive/motorcycle engines/drivetrains for many decades and have owned inboard boats for 12 years; but has been many, many years since working with 2-stroke engines - can't find a shop in my area that will still service 2-stroke Rotax engines, so am learning about them again.