I installed a SuperTrapp Mudslinger and a K&N yesterday and took my AC 400 out for a test ride today to see how it was running.

During my ride, I noticed a fuel leak that appears to be coming from the carb vent hose.

The carb is bone stock, and hasn't been touched. I wanted to see how it was running before planning any jetting.

What does this mean? How worried should I be?

 

not very worried your needle are prolly sticking i suppose clean the carb and it will be alright

 

Clean the float while your in there.

 

I think I figured out what's causing my gas leak.

After looking at it again today and thumbing through the manual, I found that the float bowl has a drain screw and hose.

I think my drain screw might have backed out, and that's what's causing the leak. I'm going to check this week to be sure.