Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Check the push rods and valve clearance. Back firing can cause these 2 parts to get off and mower to run rough.
Just wanting to check in with you and see if you have been able to repair the issue. Let me know if I can help further.
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I am unsure. I do not handle the money side. There should be a spot at bottom of page for you to contact the web site