Ok guys I just got a new boat and it's the first time ever having an outboard. It has 1972 Johnson 115hp 2 stroke. Before I bought the boat I had the motor checked out and the mechanic that looked at it said it was in great shape. I have taken it out 3 times an it has always ran like a charm. Well last night I took it out and it did great until it was time to head back to the boat ramp. I turned it on and pushed the throttle up. When in low throttle it doesn't seem to have any problems but when I try to get above 5-10 mph it won't go. The rpms go up like it wants to go but it just won't. It kind of jerks like its tryin to go but she won't do anything. A trip that took me about 10 mins to make ended up takin me about 30 mins to make it back to the ramp. I could only go a little faster than what my trolling motor could do. Like I said this is my first outboard so I'm completely clueless about it... All input would be appreciated, I need to get it fixed so I can make it to the big 30 this weekend
