Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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You could adjust the rpm up some in order to maybe fix the problem, however I would check all of the drive system before doing so. Is the belt stretched out so that it is slipping? Are you working with a really wet/heavy snow, this would change how far the snow could be moved or blown. I would not want to increase the rpm any above 3600 no load or you risk doing damage to the engine (possibly breaking a connecting rod). Which engine do you have in this machine?