My '87 Trx maintenance and mods.
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Thread: My '87 Trx maintenance and mods.

  1. #1
    Junior Member Glorfindel's Avatar
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    My '87 Trx maintenance and mods.

    So, i just got my trx and since it's off season here, aka winter, i'm working on it to get ready for 2020 season.

    First thing i did is removing the head. The head is stock. So i did a little port job on intakes/transfer without touching port timing.

    The pics are after sand blasting, there is little bit more job to do, but it's almost done.

    I removed the clutch cover and cheked the impeller....

    So first question, is it normal that the impeller is hard to turn??? They way it's done, to seal both side and the spring stuff is pretty new to me.


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  2. #2
    Junior Member Glorfindel's Avatar
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    Got my answer on BHQ.

    Thx.

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    Senior Member acecarlos's Avatar
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    The WP Impeller answer is Yes, they are hard to turn when the Mechanical Seal, Oil Seal, and Shaft are New...once worn in they are a lot easier to turn...never should they turn freely or spin with little resistance, that's an indication the WP assy is worn out.

    If you "sand blasted" as stated; you need to ultrasonically clean the cylinder vigorously; if you don't it will wear your piston & cylinder quickly as sand particles embed into the Aluminum casting, Harsh washing alone does NOT remove the sand particles.

    Carlos
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  5. #4
    Junior Member Glorfindel's Avatar
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    Thx for the reply !!

    Yes, the sandblasting was not a good idea. Kind of a brain fart ;-)

    Hopefully, the porting was not finished, so i reworked some area and did the final surface finishing with sanding drums.

    Lesson learned.


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    Junior Member Glorfindel's Avatar
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    Rear caliper. One piston is jamed.



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    Senior Member acecarlos's Avatar
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    Quote Originally Posted by Glorfindel View Post
    Rear caliper. One piston is jamed.



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    Use a grease gun or Hydraulic pressure to remove frozen piston...FYI; fill from Brake Oil Line inlet.

    Carlos

  8. #7
    Junior Member Glorfindel's Avatar
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    Quote Originally Posted by acecarlos View Post
    Use a grease gun or Hydraulic pressure to remove frozen piston...FYI; fill from Brake Oil Line inlet.

    Carlos
    I'll probably have to make an adapter (M10x1.25) to use hydraulic pressure from our hydraulic jack.

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    Junior Member Glorfindel's Avatar
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    .sorry.
    Last edited by Glorfindel; 11-27-2019 at 09:52 PM.

  10. #9
    Senior Member 2ndmoto's Avatar
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    I wouldn't suggest filling your caliper with grease, would be a chore to clean afterwards. I would soak the piston in pb blaster. Hook it back up to your brake system. slightly compress the working piston with a c-clamp, to keep it from falling out, then pump the brakes to see if you can get the stuck piston to move. If not, use a propane torch to heat the caliper slightly and try again. I have drilled and tapped pistons before, then use a slide hammer to pop them out. You have to be extremely careful, so you don't drill into the caliper body.

  11. #10
    Junior Member Glorfindel's Avatar
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    Quote Originally Posted by 2ndmoto View Post
    I wouldn't suggest filling your caliper with grease, would be a chore to clean afterwards. I would soak the piston in pb blaster. Hook it back up to your brake system. slightly compress the working piston with a c-clamp, to keep it from falling out, then pump the brakes to see if you can get the stuck piston to move. If not, use a propane torch to heat the caliper slightly and try again. I have drilled and tapped pistons before, then use a slide hammer to pop them out. You have to be extremely careful, so you don't drill into the caliper body.
    I did an adaptor yesterday to be able to use a manual hydraulic pump. I didnt try it so far 'cause one fitting is missing. I should get it next week.

    I also worked on a lefty thumb throttle for a friend.



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