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1989 Mercury Classic 50
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<blockquote data-quote="maintenanceguy" data-source="post: 468077" data-attributes="member: 24227"><p>Fuel and oil coming out of the carburetors indicates that air from the crank case is being pushed through the carburetors backwards when the pistons move up and down.</p><p></p><p>The reed valves are supposed to allow air to only flow in one direction. I suspect a bad reed valve - either broken (unlikely) or bent from age just enough to prevent it from sealing against the air pressure in the crank case.</p></blockquote><p></p>
[QUOTE="maintenanceguy, post: 468077, member: 24227"] Fuel and oil coming out of the carburetors indicates that air from the crank case is being pushed through the carburetors backwards when the pistons move up and down. The reed valves are supposed to allow air to only flow in one direction. I suspect a bad reed valve - either broken (unlikely) or bent from age just enough to prevent it from sealing against the air pressure in the crank case. [/QUOTE]
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