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150 hp mercury outboard - Boating

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017

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SOURCE: 9.8 hp mercury outboard shutting off in low idle speed.

My problem ended up being the spring on the reed valve being weak.But at the same time and while I had already had my carb broke down I took a can of carb cleaner to it and cleaned it. In order to replace the spring on reed valve you will have to buy a new one, but don't worry I only payed about $6.00 for mine. You may also look into replacing your primer bulb if you haven't already because may allowing air to build up in your gas line while you are basically idiling.Once you get the carb straightened out you may have to reajust it again. If I might be able to help you again you may contact me at

Posted on Jun 16, 2009

  • 1 Answer

SOURCE: Free wiring diagram for 1978 Mercury Outboard 115 HP boat motor

I have a maintainance manual for this engine (I have the same one) with pages of wiring diagrams. What specific system/area are you interested in, I could scan in the page(s) and email them to you.


Posted on Sep 20, 2009

  • 7 Answers

SOURCE: I have a 1978 mercury outboard 150 HP motor that

For the DIY boater it could be a number of possibilities - fouled plugs, old fuel, improper air fuel mixture or dirt in the carburetor.

Pull the plugs and check the color of the ceramic. Light tan is good. Dark and oily is an indication of misfiring, fouling and too rich oil or improper air mixture. Make a note of which plug came from which cylinder. If they're all about the same color (dark) replace them all. Properly set the electrode gap and install the plugs.

You could try spraying the intake with carb cleaner like "Gum Out"
to clean out the carbs too.

Drain and clean out the sediment bowl of the carb(s) test again.

If cleaning sdoesn't take care of the problem then you need to Reference a Mercury marine manual for initial air screw mixture settings, ie: air screw location and how many turns out are recommended.

Air fuel mix is adjusted by a screw on each carb. No more than a 1/4 to 1/2 turn should be made at a time. Test again.

Also when you store the motor for the season, get some "Gas Stabilizer" for the fuel tank. Mix the recommended amount in a full tank of fuel, run the motor for several minutes. This step will put the stabilized fuel into the carbs for storage.

Hope this helps.

Posted on Oct 05, 2009

  • 86 Answers

SOURCE: Spark plug gap 150 hp Yamaha outboard

The correct gap is .035

Posted on Oct 16, 2009

  • 202 Answers

SOURCE: changed the ignition switch on 150 EFI mercury Outboard

just take the old one off and put the new one on just like you took the old one off

Posted on Mar 27, 2010

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Hi Daniel!

Oil mix is 50:1 (Quicksilver recommended. Go figure!)
Here's a link to your service manual if you need it.

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