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Fuel oil mix ratio for 65 hp 4 cylinder mercury

danield

New member
"I have an old model 650 mercu

"I have an old model 650 mercury outboard can anyone please tell me the oil to fuel ratio, I was told it 50-1 but would like to be sure, thanks"
 
"Daniel, the ratio will depend

"Daniel, the ratio will depend on the serial. Your 4 cylinder model if built before 1966 would run at 24:1, after 50:1...

Running oil heavy on a later model would mostly only result in fouled spark plugs - running 50:1 on an early model could mean welding a piston...."
 
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