Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Unfortunately we can't tell you if your machine is still under warranty or not that is all based on purchase date and your proof of purchase or receipt. Most units will have a standard two year manufacture warranty, therefore if your machine is less than two years old it could still be covered under the warranty.
However this problem sounds like a fuel related issue and most manufactures will not cover that under their warranty.
Did you clean the main jet and fuel nozzle on the carburetor? If not this would be my first step for troubleshooting or repairing your machine.