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Check the actual model and serial number with Mercury. If newer it’s possibly a four stroke. If it’s an older motor it’s more likely to be a two stroke.
2 possibilities:
-1 Your head gasket is burned. Caution, some Mercury engines have no head gaskets. I could tell if I had your serial number.
-2 Your cylinder has seized. If it's the upper cylinder, you'll have also to check your cooling system! Look at your spark plug if you can't see some 'aluminum' deposit on it. Or, inspect the inside of that cylinder with an endoscope.
Such an old engine is mostly not worth a complete overhaul. So, in case of seizing, just hone that 1 cylinder and use a new piston with rings.
It's in any case better not to use that engine in this state.
Disconnect the battery then remove the wire off the starter , remove the bolts that hold the starter to the engine !
Bolts might be across ways or come upwards ! Pending what modle /make of engine you have !
I have a problem with my 2 stroke 20hp mercury 1989,when I run 10-90% throttle it's works fine but when in 100% its only runs in 90% and doesn't sound normal like it's not burning right.
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