Seadoo education time,alright class listen up,The Seadoo is a porsche,the yamaha is a chevy either will get you where you want to go,just one will get you there faster and you will have more fun getting there.The Seadoo maintaince is a little higher and there are some things that break,keep the exhaust bolts tight,if in doubt tighten them some more,run decent oil it it its not a weed eater don't put wally world oil in it.The old black starter solenoids are junk get a brown one you will be much happier,never ever replace a blown fuse with a higher amperage fuse,if the fuse blows their is a reason ,find out why.Replace the gray fuel lines they are junk,replace ever piece of it,they came out when no alcohol was in the fuel,alcohol eats the lines like candy,candy inside the carbs is not a good thing,clean the carbs ,this is not a suggestion this is a must, replace the lines with regular automotive fuel line.The jet pump has oil in it ,change it because the last guy probably didn't and dosen't even know its in there,you do know know so you have no excuse just do it.There is a fuel filter,clean it because the last guy didn't know it had one either.The wear rings are plastic,plastic is good but it dosen't last forever,if it needs one change it.Other than that the 720 Rotax is one of the most reliable watercraft engines ever built enjoy.The 720 is basically a 587-657 on steroids,don't get carried away hopping it it up,bolt ons are ok but do not go past that,it will quickly let you know when you have gone too far.