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  • #1

    F115 synchronization

    Hey guys,
    I was synchronizing the throttle intake on my 03' F115 and I am unable to get all the cylinders the same. No matter how I adjust it always leaves the #2 cylinder out of sync. Is this normal? And with only one adjustment screw how do you get them all in sync?
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  • #2
    How are you seeing this sync on the cylinders?
    Just curious if the procedure you are using is in the service manual

    Comment

    • #3
      A full model # would help but for this 2003 F115 it's similar to my F150(looking at the parts fisch:

      2003 F115TJRB Yamaha Outboard INTAKE 1 Diagram and Parts

      I gather you have manometer? And there's ports on the plastic runner in-take?

      With ONLY two TB's, there's ONE sync screw between them.

      Cylinders 1&2 cannot be synced to each other as their on ONE throttle shaft (same for 3&4). You can only sync the butterflys between the TWO TB's

      My manual is somewhat confusing on how to set them but as noted, you can't separately set #2 cylinder, it'll be off (or as it is with #1 ALWAYS).

      How far out is #2, mm wise at idle?


      .
      Scott
      1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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      • #4
        I am using an inexpensive manometer. Its a fluid gauge and reads all four cylinders at once. I tried to attach a picture of it but the file was apparently to large. 1,3 and four are in a straight line together with #2 about 3/8 to a 1/2 an inch below. The intake ports are actually in the casted manifold entering the block. The reason I am syncing is to try and cure a stalling at idle problem I have ha since I've owned the engine. It's actually a F115TXRB.

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        • #5
          like it has been said.
          you cannot sync 1&2 or 3&4.
          why not fix the stalling issue?
          it is not throttle plate sync.
          what is the ISC request at idle??????

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          • #6
            I would have to reconnect YDS to get that answer for you and I will. But with that said ISC is brand new. Seemed to make no difference.

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            • #7
              as the ISC is NOT monitored it or the harness can fail. may show up as an intake air pressure or other code.
              can be tested.
              last F90 I did a few weeks back the ISC locked and the wire burned in two right at the connector.
              so I had to repair a connection as well.
              there is n air adjusting screw for bypass air in the inboard side of the front of the shutter.

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              • #8
                I have been all through the harnesses and saw no issues. With the attempt at syncing I did manage to get the engine to stop stalling but still coughs as if it still wants to. I see two screws accessible from the side of the engine. Its a little confusing as different sources call these different things. I was using the screw deeper in on the shutter to try and sync and the easier one to get to adjust idle. Was I wrong?

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                • #9
                  I would carefully follow the SM procedure.
                  then look at the latest tech bulliten for the F150 procedure. they use all the same parts just a different location.
                  once I had cyl 1&2 syncd to 3&4 you can use the shutter bypass air screw to ;line up #2 to #1.
                  but do so at your own risk as this is a factory setting and not supposed to be field serviced.
                  I had a customer some years back that he and a buddy removed all 4 shutter bypass screws and it took me most of a day to make it idle again.

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                  • #10
                    I have RB's latest F150 sync procedure as a PDF if you want it...

                    PM me with an e-mail address and I'll send it to you..

                    Question for RB, is there also a bypass screw for the F150? (And no I'm not messing with it, just curious).
                    Scott
                    1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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                    • #11
                      out of memory I cannot remember on the F150.
                      the only reason I remember the F115 is the issue of the guys that removed all 4 then brought it to me.
                      what clued me in was when he told me he had removed the A/F mixture screws.

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                      • #12
                        Originally posted by rodbolt17 View Post
                        out of memory I cannot remember on the F150.
                        the only reason I remember the F115 is the issue of the guys that removed all 4 then brought it to me.
                        what clued me in was when he told me he had removed the A/F mixture screws.
                        Thanks.. I didn't see anything in the manual about it..


                        Syncing the TB's on most Yamaha FI'ed bikes are with ONLY air screws.

                        My bike does have one butterfly screw(for the two separate , 2 BBL TB's) but your not supposed to mess with it.

                        On the newer Yamaha 1300's, there's an "un-authorized TB sync". With 4 separate TB's, guys adjust all the shutters closed(with the screw(s) your NOT supposed to touch). Then adjust with air screws (normal sync).

                        .
                        Scott
                        1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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                        • #13
                          yep
                          but sometimes you must touch the so called tamper proff non-field adjustments.
                          however ONLY when you isolate that it is the issue.
                          usually it is a running issue that causes the intake vacuum not to sync.

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                          • #14
                            Thanks Townsend, I'll PM you my email address. One more quick question fro you guys, Why is there a shrader valve on the top of the VST? Is this for purging?

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                            • #15
                              ya gotta vent it to drain it.
                              yep it is that simple.

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