Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Does the engine seem to have good power when this is happening? How old is the machine? Could it still be under the manufacturers warranty?
Have you had this problem ever since you first received the machine from the dealer or did it just start happening? It could be air in the fuel line, you may need to bleed the fuel system.
Is the transmission full of fluid, if it is low this would cause hesitation and poor performance? The transmission filter could be stopped up, I know that you said it is a new machine but what if there were some impurities left inside the transmission during assembly that have now got into the filter and creating a blockage not allowing fluid to flow as it needs to which would cause performance problems.