So, my 4 stroke suzuki 15 horse isn't running right and I got to messing around with it today. To get the stuff I need, I had to move my roommate's 4 stroke 4 and lay it on the ground. Having seen many motors laying down with the handle up throughout life, I think nothing of it. Come to find out, those were all 2 strokes. [smiley=1-doh.gif] After an hour of fiddling around with no luck, I head out to run some errands. A little later I get a call from a pissed off roommate about the mess I've made of his motor and all the work he's going to have to do to get it cleaned up. Luckily he has the know- how to do the work himself and no boat at the moment to put it on so it's not time sensitive and won't cost me too much to pay him for whatever parts he needs, but I still feel really bad. Anyway, to no one's surprise, he now seems a little less than excited to help, so I'm asking y'alls' advice. I have to choke the motor every time I go to start it (not normal in the past), and when I go to push in the choke, it sputters for a couple seconds and dies. Trying to keep it alive by revving it as it sputters does nothing to help, and the couple times I've gotten the choke pushed in more than the slightest bit, I've had to keep the rpm's high. The carb was just cleaned, and fuel lines were just replaced, so I don't think it's a fuel problem, but from the previous story, you already know I don't know a ton about motors. Other than rolling of the eyes and laughter, any thoughts?