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Does it continue to run so long as you hold the start button? If so this is usually due to a safety that engages once the button is released such as oil sensor or low/no voltage as just a couple examples of many, if if however does not matter if you hold then it very well may be engine related to which we can further diagnose. Could be a fuel supply issue, spark issue, many things. Please let me know.
I am just seeing if you still need assistance with this problem? The reason I ask is because I see that your question has not been answered sooner and I wanted to make sure if you still needed help.
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