Hi, I'm new to the forums. I have a 2003 Outlander 400 that was given to me. I had to replace all of the fuel lines as it had been sitting for many years I also cleaned the fuel tank and I cleaned the carb many times and I put a brand new side diagram. The intake boot looks good and I think the fuel pump is good bc it idles and runs good to about 1/2 throttle and then sputters. Its got a brand new air filter too. I can't figure it out. I'm pretty sure it is running lean bc if you give it a little choke it smooths out, and the plug is dry. But all the jets are clean. And the needle moves up and down as it is supposed too.