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If it hasn't been used in 3 years you most likely have a clogged needle valve in the carburetor from be gas. What happens when fuel gets stale and is able to evaporate is it causes something called varnishing of the lines. This prevents the bowl of the carburetor from getting fuel. I'd recommend you take in in for service. Once it's fixed I always use a product called SEAFOAM in my gas to prevent this in the future.
Okay. I'd still use the seafoam it an amazing fuel additive.