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Seloc Mercury Outboard Engine Repair Manuals SEC-1416 1990-00 2.5-275 HP Questions & Answers
Serial number decode0B142498
Go to boats.net - Mercury parts - search under hp/serial range - select 20hp 2 cylinder - it will be under the first selection 0A730007 and up.
90 HP 4 stroke runs smoth as silk at 1800 move higher and it stalls have replaced several parts rebuilt carbs no help
when an engine stalls or looses power at high rpms , it is because there is a higher need for fuel to supply that requirement
fuel shortage can be from
blocked filters
low float levels in the carby/s
vent problem in the fuel tank/s
perished hoses letting in small quantities of air
the hoses failing intrenally and blocking off the fuel flow
pump problems from bad diaphragm or the rubber in the hose again blocking the main jets in the carby/s
another area to be checked is the ignition system being able to provide the spark at a higher rpms
this problem can be from failing condenser, ignition module or coil/s
Water in engine oil.
water can get into the engine oil from several points
if the engine has a sump oil cooler hen the cooler coil wil be cracked or corroded at the seal points
more likely the housing behind the water pump has corrosion in it behind the impeller and water pressure is making it leak into the sump
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