Can I drop a small car motor into my sea doo jet boat instead of the stock 787? How much trouble would it be?

[trey_lunder]

96 sea doo challenger. Everything there but the motor itself.

[bayliner6065]

take into consideration---how you gonna hook it up to the jet drive?---how you gonna keep it cool from over heating-?---also exhaust set up---controls for the gas throttle---electrical hook ups to keep the batterry charged---last but not least weight---will it be top heavy a wanna roll over on turns?---but if it could be done a small v-6 might be sweet--no much sense in using a 4 cylinder --the two stroke you have in there now should out rev and out power any 4 cylinder---a small motorcycle engine could be more easier done---like a 4 cylinder air cooled or 6 cylinder air cooled engine---make sure you have vents for air if you go with air cooled--