Ok i have a 2008 ltz 400 and i rebuilt it about 5 months ago. It ran fine around 3 months ago until it started having starting issues it seems like it’s extremely cold blooded. Ive rebuilt the carb 2 times in 7 months and i just put a stock jet in it. But its still doing the same exact thing. It will take absolutely FOREVER to start. Im talking like turning it over for 5 minutes. Of course i let the starter cool down. But ive done all i know what to do with it. Ive also changed the spark plug recently to an ngk. Its all stock but the thing is we bought it without an airbox lid. Because the previous owner had an oversized jet and a dg exhaust. So yeah we turned the entire thing back to stock but the stock exhaust we bought, the older owner cut the spark arrestor out of it. That’s really all i got to say i just need someones help desperately because ive done all that i know.