The timing specifications for a 1991–1999 Mercury 2.5 Liter 2-Stroke V6 outboard typically vary depending on the specific model (150, 175, 200, 225, XR6, carbureted, EFI, or high-performance versions such as the SST-120, 245 HP, 260 ROS, 280 Race/Consumer, 300 Drag, S3000).
Here are the general timing specs for this range:
Base Timing (Idle Timing)
Carbureted Models: 0-8 degrees BTDC (Before Top Dead Center) at idle.
EFI Models: 0-10 degrees BTDC at idle.
Best to set this while idling and to the desired idle RPMs, base timing is the correct way to set idle on these motors.
Maximum Advance Timing (WOT Timing)
Standard/Carbureted Models: 21-25 degrees BTDC at wide open throttle (WOT).
High-Performance Models: Up to 25 degrees BTDC at WOT, depending on the specific model.
Idle Speed:
600-700 RPM in gear.
Additionally, always verify timing with a timing light while following the manufacturer’s recommended procedure for your specific engine.
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