I went for a ride close to my house on Saturday. During the ride to the trail and on the trail the bike ran great. After the dirt portion was over I started the bike up to ride home. The entire ride home the bike ran like crap, stumbling all over itself. It was poping like it was running lean. The fuel hose wasn't blocked. Before I tear the carb apart does anyone have any ideas where I should look for the problem. Prior to the ride I had moved the clip on the needle up for winter if that would make a difference.