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27.05.2021 9:07:31
Lock the dial indicator in place by turning it to the 0 position at top dead center. here
See full version: Timing a Mercury Outboard Motor
Lock the dial indicator in place by turning it to the 0 position at top dead center. here
Locate the flywheel. Remove the cowling cover on the outboard motor's power head and detach the spark plugs. more
Detach the throttle cable from the power head and attach a timing light to the top spark club lead. [links]
Install your spark gap tool into the holes where the spark plugs usually go. [links]
Adjust the timing. Turn the flywheel counterclockwise until the dial indicator is a quarter turn past the .464 mark. Now turn the flywheel clockwise until the dial indicator reads 464.
Re: setting float level on 50 hp mercury
What is the serial number on the motor. Is this a 3or4 cylinder.
Re: setting float level on 50 hp mercury
From the information given you have the Center Bowl type carburetor. With the float mounted with the needle in place and the carb upside down measure from the face of the carb bowl seal surface to the top of the float. This should be 11/16 inch. To adjust bend the float tab lever in the narrow part of the lever. This is the needle actuator lever in other parlance.
1998-1999 Mercury/Mariner Outboard motor service manual application: 98-99 Mercury-Mariner 9.9hp (9.9 hp), 15hp (15 hp) Bigfoot and Non-Big Foot 4-Stroke Outboard Engine. Models Covered are Mercury - Mariner 9.9/15 (4-Stroke) (323 cc) & 9.9/15 Bigfoot (4-Stroke) (323 cc) with Serial Numbers 0G590000 and Above.
Section 1 - Important Information
a - Timing Belt Tensioner Screw M10 x 45
b - Tensioner Spring [links]
Turn the engine on and allow the motor to warm to normal operating temperatures. more
NOTE: Most idle adjustment screws are located in the same area as the motors listed in the beginning of this article. Some differences may apply depending on year and model.
A setting that is to lean will cause hard starting on a cold engine. In fact, the main reason for hard starting on a cold engine is a result of a lean setting. Generally, its always better to have the setting a little rich rather than on the lean side. Always make sure the the engine is not running lean. If after the idle mixture adjustments are made and the motor hesitates during acceleration, the mixture is to lean. This can be resolved by enriching the mixture slightly by turning the idle mixture screw inward. Retest the acceleration condition after the adjustments have been made.
Testing and diagnosis helps determine problems and possible causes. Its important to perform extensive testing and troubleshooting prior to any major tear down or repair work. This ensures that the full extent of the problem is understood beforehand and may prevent any unnecessary repair work. Its recommended you use a factory repair manual when performing repairs on any vehicle, additional safety precautions, or technical data maybe included.