Hey guys here's the deal I purchased a yz400f last year and it is the first bike I have ever owned. Midway through the summer last year it started leaking fuel and slowly got worse. Bike ran fine just leaked fuel. So last week I ordered a moose racing carb rebuild kit and put it in. I put the OEM jets from the jetting database in the bike and I can't get it to fire. If I let it sit for a while I can get it to fire but only with the choke on. Like i said I put all new jets in it. The bike ran fine before I did the rebuild just didn't want fuel every where. It's getting frustrating main jet was a 178 and I started with that one and changed to the 175 when it wouldn't start. The pilot jet that was in it I was not able to tell what it was because the numbers were gone. I put the OEM one in that came with the kit. If anyone has any advice on what I can try next I would love hear what I it is. Oh and my accelerator pump was good.