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Service the air cleaner element. Tighten or replace the spark plug. Check the Specifications section for the correct plug and gap for your unit. Repair or replace fuel filter and/or fuel line. Refill with fresh, clean unleaded gasoline with a pump octane of 89 or higher mixed with an air cooled engine oil that meets or exceeds ISO-L-EGD and/or JASO FD classified oils at 50:1 gasoline/oil ratio. Consult with an authorized Shindaiwa servicing dealer. Engine is rough at all speeds. May also have bl