Wow, you had alot of questions. I have never replied on here but figured i would give you my opinion. 1st, ive owned alot of 2 stroke and 4 stroke engines, mainly onland quads and what not. I think the 4 stroke is a more reliable, long lasting, cleaner running engine. As for power, theres no comparing a 2 stroke and 4 stroke in power. If its the same CC just differnt stroke, the 2 stroke will almost always produce more power. I think some of these skies use a turbo now in the 4 strokes to compansate. I have a 96 seadoo gsx 800 (110 hp 2 stroke) that ran like a raped ape for years, but now the battery wont stay charged (salt water ruins). I think if i do get a new one i will spring for the newer 4 strokes as i also believe that the 2 strokes will soon be out of production.
As for mixing, my seadoo has an oil injection unit. Just fill when low and let the machine inject the oil into the fuel as needed. Its much easier than mixing the right ratio and filling with gas cans and stuff. I would also have to guess that the 4 stroke motors would get slightly better gas milleage as well.
Also, if your looking for 50 mph, i would think that most waverunners at or around 800cc and above should produce that no problem.
BTW, i think 1500 for your ski is more than reasonable exspecially if its on a trailer. Try using craigslist.com to advertise and sell it, ive sold tons of stuff on there.
Hope this helps. At least you will be out riding one or the other this summer, ill be sittin at the docks with a battery system that wont charge....HAHA
Last edited by stanranger; 03-30-2008 at 08:23 PM.