As the title states, my motor won't pull up revs more then 2100 rpm. I recently purchased the boat and for the last 6 outings everything has been running great. The powerhad was rebuilt in July of last summer. It ran fine in the morning, but in the afternoon it lost acceleration. It will rev up fine to 2100 then it won't go any higher, and runs steady at that rev but sounds boggy. I have replaced the fuel filter, and put a new primer bulb on it, the existing one was soft when pumped up. I have bought carb rebuild kits, and wanted to know if someone has some insight of what may be happening, or more importantly, what isn't happening. Thanks in advance.