• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

2. Old threads should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís thread (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new thread of your own.

4. If you have a question for the original poster (OP) and the thread is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old thread.

5. By starting your own thread, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Mercury 3.3 HP gag/oil mix 2003

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Mercury 3.3 HP gag/oil mix 2003

    Can someone advise the proper ratio of gas/oil for my 2003 Mercury 3.3 hp two stroke outboard motor?

    Thanks


  • #2
    Re: Mercury 3.3 HP gag/oil mix 2003

    Mix 50:1 with quality mfr's oil rated TCW-3 or better. Use regular unleaded non-gasohol if available, if all you can get is gasohol use regular, your little kicker won't need any more octane than that and higher grades have more alcohol which is less-than-desireable.

    Use a carbon-cleaning additive at least several times a season, this'll keep your rings from sticking. Seafoam is great stuff and also acts as a fuel system cleaner & fuel preservative. www.seafoamsales.com

    If you can't get Seafoam, all major outboard mfr's offer carbon cleaning additives and fuel conditioners. Chevron Techron additive works well, also.

    HTH & enjoy........ed

    Comment



    • #3
      Re: Mercury 3.3 HP gas/oil mix 2003

      I thought these newer motors ran on something less than 50:1 , no ?

      Comment



      • #4
        Re: Mercury 3.3 HP gag/oil mix 2003

        OMC flirted with 100:1 ratio's for a while, if that's what you mean by "something less than....". But I didn't think that Merc went radical on any of their little non-injected motors.

        The biggest problem with 100:1 was that it left too little of a residual oil film in the crankcase, to preserve bearings and other sensitive parts while the engine sat for a long time. So the parts would begin to rust. Not a good thing!

        Far as I know, all the non-injected Mercs ran 50:1 in 2003.

        Piqued my curiosity so I Googled and found this Wiki entry that indicates a 50:1 mix still:

        http://wiki.answers.com/Q/What_is_ga...rcury_outboard

        Can't confirm that source but it seems evident that 50:1 makes sense.

        I'm sure someone with an owner's manual can confirm.......ed

        Comment



        • #5
          Re: Mercury 3.3 HP gag/oil mix 2003

          The engine was actually designed by Tohatsu to run at 100:1 and will do so without any problem. The reason they were only released as 50:1 engines was due to the fear that people would not perform routine maintentanice on the cooling system and that the engines would not last long with reduced water flow through that coolant system.
          Elvin
          My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

          The 3 Rules:

          1) Look in your service manual first...Then ask me if it is correct.
          2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
          3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

          Comment



          • #6
            Re: Mercury 3.3 HP gag/oil mix 2003

            I have the Merc 2.5 hp - same motor just a smaller carb. I found out today that the motor is actually a Nissan/Tohatsu from TOHATSU GURU. Apparently all Merc's up to 30 hp are Tohatsu's.

            I needed a replacement carb and the Merc dealer wanted $165 for just the carb. Per GURU's knowledge, I called the local Nissan Marine/Tohatsu dealer and got the carb for $90.

            If you ever need parts for that motor - go through a Nissan/Tohatsu dealer - same parts but almost half the price.
            1989 Four Winns Sundowner 205 5.7 OMC Cobra

            Twin 2005 Seadoo RXT's

            Comment



            • #7
              Re: Mercury 3.3 HP gag/oil mix 2003

              is this ratio available for the 3.3 hp mercury two strokes from 1996 ?

              Comment



              • #8
                Re: Mercury 3.3 HP gag/oil mix 2003

                It's 50:1 regardless of year.
                Elvin
                My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

                The 3 Rules:

                1) Look in your service manual first...Then ask me if it is correct.
                2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
                3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

                Comment

                Working...
                X