Operation; Engine Break-In; Engine Break-In Fuel Mixture - Mercury 300XS OptiMax User Manual

Engine Break-in

Severe damage to the engine can result by not complying with
the engine break-in proceedure. Engine damage may not be
covered by the limited warranty.
Avoid loss of boat control or an unsafe boat handling situation.
Increasing trim under can place greater load on an engine and
enhance breakin. At higher speeds, increasing trim under could
produce a dangerous boat handling situation. It is the boat
operator's responsibility to always drive in a safe manner.
Always vary throttle settings during Break-in
1st Hour
• Allow engine to warm-up for 30 - 60 seconds.
• Do not idle for more than 5 minutes
• Run the engine the majority of the time between 4000 - 5400 RPM
(approximately three quarter throttle).
• Change engine speed approximately every two (2) minutes.
• Avoid trimming the outboard out (up) beyond a vertical trim position during

operation.

• Avoid using hydraulic jack plate (if equipped) to raise engine during
break-in cycle.
Next 3 Hours: Change engine speed every 10 minutes.

Engine Break-in Fuel Mixture

Avoid engine damage. Do not add oil to the gasoline in the fuel
tank.
The Propulsion Control Module (PCM) controls oil and fuel mixture
during engine break-in.
OPERATION
CAUTION
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WARNING
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Break-in Procedure
CAUTION
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