I purchased a new Yamaha 8hp 4st (2009) and it has never run right. More time in the shop then on the boat. First it would race while in idle until put in gear. After a couple of weeks of this, it wouldn't start at all. I took it back and they rebuilt the carb. (at my cost). Immediately took it back to the boat and in order to keep it running you needed high RPM (too high to even attempt to put in gear). I took it back and it ran fine, idled right down. I took back to the boat, had good luck for a few weeks and now can't start again. I took it back to the shop, they have had it for 2 wks and say nothing wrong. I have no faith in the engine at all. The shop is a long drive from the boat and I honestly wonder if the drive itself isn't freeing something or shifting something that causes it to run. The engine has less then 10 hours running time. Any thoughts? I go to the shop to pick it up but really have no reason to believe it won't be in a state where I can't start it again. The shop will work with me, but they are offering no advice. BTW: I always bring my gas can with the engine, so it isn't the fuel which is fresh with factory suggested additives.