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Yamaha 40 HP outboard 4 stroke

redhorserider

New member
My engine runs rough at low RP

My engine runs rough at low RPM but fine at full throttle. I had to replace the fuel line and bulb due to theft and it has run rough ever since. The gas is about 6 months old but has stable in it. I replaced the plugs and used regular automotive fuel line. Could it be the fuel filter?
 
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