Mercury 250 Specifications download pdf (Page 55)

OPERATION

Setting Trim Angle While Running Engine at Idle

Speed

The exhaust relief hole on the outboard may become submerged

if the outboard is trimmed full‑in while running at idle speed. This

will cause exhaust restriction, rough idle, excessive smoke, and

fouled spark plugs. If this condition exists, trim the outboard up until

the exhaust relief hole is out of the water. The outboard should be

lowered for accelerating from a standing start or from idle speed.

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Engine Break‑in Procedure

IMPORTANT: Failure to follow the engine break‑in procedures can

result in poor performance throughout the life of the engine and

can cause engine damage. Always follow break‑in procedures.

GASOLINE/OIL BREAK-IN MIXTURE

Do not use pre‑mixed gas and oil during break‑in. Oil from the oil

injection system will supply adequate lubrication during engine

break‑in.

BREAK-IN PROCEDURE

1. For the first hour of operation, allow the engine to warm up for

30‑60 seconds.

a. Run the engine at varied throttle settings, the majority of

the time between 3000 and 4500 RPM or three‑quarter

throttle.

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Mercury 250 Specifications Page 55