I went through something similar today...after checking the tank venting, petcock, and carb lines I removed the carb. Took it apart and found debris in the float bowl and main jet (mine ran ok til about 3000rpm then coughed and sputtered).Well after attaching the vacuum hose it only ran for a few more seconds. I've nearly done the entire trouble shooting list, other than removing the carb and tearing it apart.
I get spark, I get fuel to the carb, but it just isn't starting for more than a few seconds.
I had a similar experience a few years ago with my 07.. turned out to be the float valve needle in the carb. The rubber cone gets affected by the ethanol in gasoline. You likely cannot see anything wrong with it. Bought one and changed it out. Soaked the carb with pine sol to clean it while I had it apart.
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