How old was fuel already in tank? I know this because my Kawasaki sat for four months without use, not even started and the fuel in total was about six months old, and I could not get it to run when starting. I rang Shell and asked if fuel can deteriorate over time, they said it may collect condensation and some chemicals can evaporate, so lose quality. I drained fuel and replaced with fresh fuel and started and ran no problem. There may have been enough old fuel to contaminate new fuel.
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