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Re: What is the fuel mixture for a 9.9 mercury outboard...
With modern oils all 2 cycle engines (if it is a 2 cycle) can be safely mixed at 50:1. Most auto parts stores will carry the proper 2 cycle oil for outboard engines.
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What should the compression be on a Mercury outboard?
180-210 PSI
What Outboard Compression Test Results Mean. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI.
You are in car category. Should be in marine or boat section. If your outboard has a vacuum port then have engine running in water and connect a vacuum gauge to it. Adjust vacuum to highest level then turn in lean until vacuum drops a bit. Lower rpm is used because high speed jets are not adjustable. High speed can be adjusted with some units having second air flow adjustment using air flow meter to sync multi-carb setups like motorcycles use.
if you have spark at the plugs there is a complete ignition circuit for it to start
fuel is the question --are the plugs wet or dry
dry plugs indicate no fuel
wet plugs indicate flooding
inside these motors there are reed valves that open on induction and close for the compression stroke so the mixture is pushed into the combustion chamber
these reed valves fail and the mixture is swapped between cylinders in the inlet manifold hence no combustion mixture for the cylinders
Talk wit a mercury service center for the parts and processes
Could be several reasons for this, poor quality / dirty gas, restricted fuel line either partially blocked or pinched at some point come straight to my mind.
If you have carburetors your float is stuck. It can happen more than it should and if it is a smaller engine, laying it on its side can cause it.
You would have to look at the float and imagine which way to lay the engine down in the future. The float could also be bad. You would take it out and float it in Gas, not water to see if it sinks.
If this is a big HP outboard and injected your fuel regulator is bad.
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