YZ426 Not Starting

My Yamaha YZ426F is not starting, it has a spark and every once in a while it will pop, can anybody help me?

When is the last time you checked the valves and/or cleaned the carb?

When is the last time you checked the valves and/or cleaned the carb?

September 2008

doing the right starting procedure? and if you are it sounds like your lean

September 2008

Has it ran since September? If not, it needs a carb cleaning.

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