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1994 Polaris SLT SBT Motor Problems

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  • #16
    Re: 1994 Polaris SLT SBT Motor Problems

    Originally posted by Polaris_Nut#1
    I must be missing something here. I don't see how you could blow out the rear seal without blowing out the inner as well. Wouldn't the inner have to blow and then the outer? Mine was assembly error. I called today. It will becoming back soon. Thanks. (DON'T FORGET, RED LOCTITE ON THE TAPER)
    I won't forget the loctite! I just want to know what might be happening on the rear seals. I have instaled my fair share on SBT motors in the past, but this one takes the cake. I'm wondering if there might be a problem with a crank jig, or assmeble. I understand that the 1st SBT motor on this ski might have had a problem with the sheered woodruff key, causing the seal to blow. But the 2nd motor not having a sheered key, and still haveing the blown out seal, don't make much sense. The first motor only spun 42 rpm, and the second only 5000 rpm. Could it be possible that the 2nd motor was the 1st motor only rebuilt? I don't know. I do, know that I have spent alot of time pulling/installing/testing this ski, and i'm thinking that the motor might be the problem. My customer said that the ski ran excellent up unil the ski blew, so I more than likely, the electronics etc are still working correctly.
    SAMORA'S SKI PERFORMANCE
    WWW.SSPRACING.COM

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    • #17
      Re: 1994 Polaris SLT SBT Motor Problems

      I assure you the motors were not the same, the odds would be astronomical that the same set of cases would happen to be #1 paired together, #2 in the factory during both your build times, and #3 go to the same customer. It just doesn't happen.Beyond what I've mentioned, I really don't know what could be causing, perhaps someone else has some more insight. When you get the engine out, post some pictures of the seal as it's hanging out right now. After that, pull the seal off and take a shot of the inner - see if it's breached.
      SBT Tech Support is here to help with your problems.
      We try to answer each question quickly and accurately.
      Please do not use Private Messaging for Tech Support, use the forums.

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      • #18
        Re: 1994 Polaris SLT SBT Motor Problems

        Originally posted by sspracing
        SBT,

        This is the second time that this has happened on this ski with the SBT motor. 2 motors that I will have to pull, and reinstall. This is why I'm trying to figure what might be happining. I specifically inspected the 2nd SBT motor's rear seal. The 2nd motor was shipped with the seal in place. Something happened. Might the 2nd motor be the 1st motor that SBT shipped me this April? If so, maybe something is not right with the case or the crank. All in all, I'm just wanting this ski behind me. I want some answers, so maybe the 3rd motor install goes in, and runs correctly.
        what you can do is the same trick we did on the older seadoo 580s , use a screw and washer on the rear seal 2 or 3 to make it even . wihout a retainer any seal could pop out . you could do that now and that engine if running fine now should run fine for a long time . or send it back to SBT and put retainers in the next one if SBT says it ok and wont void the warranty that is . it only takes a few min to drill and tap a few screws :-)
        PRIDE IN SERVICE<br /> <img src="http://www.sbtontheweb.com/images/forposts/4609/1.jpg" alt=" - " />

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        • #19
          Re: 1994 Polaris SLT SBT Motor Problems

          If your carbs leaked gas due to a faulty needle/seat, you could easily get a nice backfire to blow out a seal when you went to start it? Also, did you check your reeds? Faulty reeds cause backfires.

          Doug

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          • #20
            Re: 1994 Polaris SLT SBT Motor Problems

            The reeds are new OEM Polaris. The carbs have been gone threw, and cleaned/checked, but did not have to put carb kits in them. We checked the coils in the electrical box with the first motor. Any ideas why we are now only spinning 5000 rpm's. The fist motor only spun 4200, but I blamed this on the shered woodruff key.

            I have been told that the SBT motors, have less compression than a OEM motor. The ski had its twin on the trailer next to it, and the ski really had some power compared to the one with the SBT motor in it. I am running 50:1 for brake in, but I don't think that this would make that much of a difference in RPM.

            Could this be a high speed coil issue? Both skis will rev out of the water, but on the water is a different story. I'm going to pull the pump today, and see if maybe someone put a tall prop that this motor can't turn.
            SAMORA'S SKI PERFORMANCE
            WWW.SSPRACING.COM

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            • #21
              Re: 1994 Polaris SLT SBT Motor Problems

              Originally posted by sspracing
              The reeds are new OEM Polaris. The carbs have been gone threw, and cleaned/checked, but did not have to put carb kits in them. We checked the coils in the electrical box with the first motor. Any ideas why we are now only spinning 5000 rpm's. The fist motor only spun 4200, but I blamed this on the shered woodruff key.

              I have been told that the SBT motors, have less compression than a OEM motor. The ski had its twin on the trailer next to it, and the ski really had some power compared to the one with the SBT motor in it. I am running 50:1 for brake in, but I don't think that this would make that much of a difference in RPM.

              Could this be a high speed coil issue? Both skis will rev out of the water, but on the water is a different story. I'm going to pull the pump today, and see if maybe someone put a tall prop that this motor can't turn.
              there has not been a customer yet come back and say one of the SBT engines i have installed had less power then the OEM in fact all have called to tell me or ask me what i did becouse the ski is faster then it ever was . i have seen with most of the complaints with SBTs engines that it has been the installers foult for failures or bad performance . the book can only tell somone so much , somtimes it takes many yrs in the feild to know what works and what wont . PWCs are very picky somtimes . keep working at it you will get it :-)
              PRIDE IN SERVICE<br /> <img src="http://www.sbtontheweb.com/images/forposts/4609/1.jpg" alt=" - " />

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              • #22
                Re: 1994 Polaris SLT SBT Motor Problems

                Yes, I understand your point. I have been working on this boat since April, the motor has been intalled correctly, we do it every day. Its the rear seal that has came loose on 2 seperate motors that have thrown up the flags with me. Like I said before, I have never had any problems with SBT motors until now. I don't think the rear seal popping happened account the motor was installed wrong.
                SAMORA'S SKI PERFORMANCE
                WWW.SSPRACING.COM

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