Welcome Guest - Sign Up today
Welcome Guest - Sign Up today

Announcement

Collapse
No announcement yet.

Tohatsu 70hp Timing (model M70A)

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Tohatsu 70hp Timing (model M70A)

    I’m trying to get the right timing information for a Tohatsu 70hp. The model number is M70A. It’s probably from the 80’s. From my research the timing should be 5 atdc at idle and 20 degrees btdc at wot. I think the service manual has long been out of print but am hoping someone out there has the information. Any advice is appreciated. Tom

  • #2
    Maximum timing usually does not go out of adjustment.-----And be very careful if you decide to adjust the idle timing.-----What is your motor doing / not doing ??

    Comment


    • #3
      I agree it usually is good to go but the previous owner did some “work” and I’d like to make sure things are set up properly. When I got it the timing was way off. It seems to run good now that I adjusted the timing/carburetor pickup (5 ATDC and 20 BTDC). I just don’t want to burn a piston up if I’m not in spec. From my understanding, it can run good but still damage things if the advance isn’t right. Thanks for the reply.

      Comment


      • #4
        SERVICE MANUAL : 3 & 4 CYLINDER 2-STROKES


        Description

        Covers all 3 & 4 cylinder 2-stroke models.

        Part #: 003-21036-1

        List Price (MSRP): $50.00
        Paul
        Certified Tohatsu TLDI Technician
        Buffalo NY USA

        Comment


        • #5
          That’s it? Buy a manual to verify a timing spec? Count me out. I help a lot of people (Locally) with their motors for free when a shop would charge them a $120 just to peek at it. Anyways thanks for the reply-that’s answer enough for me.

          Comment


          • #6
            The Factory service manual is your friend. Not just for specs. And not even half of $120.
            Last edited by pvanv; May 17th, 2020, 03:34 AM.
            Paul
            Certified Tohatsu TLDI Technician
            Buffalo NY USA

            Comment


            • #7
              You’re right, just bought it on eBay for $14.99. That’s less than half of $50.00 MSRP that you quoted earlier. And it’s not even one of those fireplace SELOC or CLYMER manuals (even though they’d probably have the spec I need).

              https://www.ebay.com/itm/TOHATSU-NIS...72.m2749.l2649

              BTW, the M70A is a two cylinder so the manual you pointed me to would be the wrong one. Plus, it’s a free pdf download (I already have it, downloaded it prior to my first post on this thread).

              http://www.tohatsu.dk/forhandler/Ser...202-Stroke.pdf
              Last edited by Junedog123; May 17th, 2020, 09:12 AM.

              Comment


              • #8
                If you had the correct manual prior to posting, I would have expected you to be an expert at answering your own question regarding timing. What happened? Just curious.

                Comment


                • #9
                  Hello, I didn’t have the correct manual prior to posting. I was pointing out that the manual recommended by an expert to buy was not the correct one and that it’s a free download (so why buy it). I ordered the correct manual this morning on eBay for a 2 cylinder 70hp Tohatsu (what I have, not a 3 cylinder). I simply was asking to see if someone could verify a timing spec on a m70a Tohatsu. I didn’t get a solid answer other than to buy something.
                  Last edited by GA_Boater; May 17th, 2020, 11:15 PM. Reason: We work openly or the forum becomes worthless

                  Comment


                  • #10
                    Originally posted by Junedog123 View Post
                    You’re right, just bought it on eBay for $14.99. That’s less than half of $50.00 MSRP that you quoted earlier. And it’s not even one of those fireplace SELOC or CLYMER manuals (even though they’d probably have the spec I need).

                    https://www.ebay.com/itm/TOHATSU-NIS...72.m2749.l2649

                    BTW, the M70A is a two cylinder so the manual you pointed me to would be the wrong one. Plus, it’s a free pdf download (I already have it, downloaded it prior to my first post on this thread).

                    http://www.tohatsu.dk/forhandler/Ser...202-Stroke.pdf
                    The paper manual is cool. I do have a reprint of it. They are copyrighted, so the PDF could incur the wrath of attorneys. I would zap that link if I were you.
                    Paul
                    Certified Tohatsu TLDI Technician
                    Buffalo NY USA

                    Comment


                    • #11
                      It’s also cool to help people out. The manual from eBay came in. The answer to my original question is 0 degrees at idle And 20 degrees BTDC at WOT. If anyone needs any questions answered for a M70A just ask I’ll be happy to try and help. I won’t try and sell you anything.

                      Comment


                      • #12
                        The manual also covers the M55A Motor.

                        Comment


                        • #13
                          Yeah, but you can't get parts. Not even a water pump kit, They are 40 years old. Keep that in mind.
                          Paul
                          Certified Tohatsu TLDI Technician
                          Buffalo NY USA

                          Comment


                          • #14
                            Hey junedog. I have a m70a as well. The carb air fuel adjustment screws are out of adjustment. Is there a baseline number of turns out from a seated screw. I think I saw 1 1/4 turns but I'm having some trouble getting it right without a tachometer. Thanks.

                            Comment


                            • #15
                              Sign up today
                              Manual says it’s 1 turn, plus or minus 1/4 turn. Hope that helps.

                              Comment

                              Working...
                              X