So i've just bought a tohatsu 20" sailpro LPG 5 hp motor (Deso!). In reading the manual it mentions the motor might need a high altitude kit for above 1000m. Anyone out there have any advice on this add on for the motor? Used it? Haven't used it? Thanks in advance. Also, plan to be pushing 4...

Looking into getting a motor for my raft. Been on trips that a 4HP engine can push out a good handful of boats and gear. Thoughts on what is best i.e. HP, long v/s short shaft, air cooled v/s water cooled? Thanks.