Cam Chain Tensioner
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  1. #1
    Member roamineye's Avatar
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    Hi, folks - I'm a new TW owner as of 27 Dec, and have a couple of question for the experts:



    What's the procedure for adjusting cam chain tension?



    There's a metal bracket mounted under the bike between the back of the crankcase and the front of the swingarm on a cross brace. It has a tubing barb on it, but the metal "tube" appears to be solid. What in the world is it, and what is its function? I believe it had a short piece of plastic tubing on it, about 2" long, that didn't connect to anything else. I think I knocked it off while wiping excess grease off after greasing the swingarm.



    Several searches in this forum haven't yielded any help.



    Thanks in advance!
    1988 Yamaha TW200

    2007 Honda ST1300A

    2008 Suzuki DR650




  2. #2
    Senior Member lizrdbrth's Avatar
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    The j-tube is for the carb vent. It's supposed to have another piece of tubing on the south end of it, but no one's ever seen one cuz they fall off 10 miles from the showroom. Without it the j-tube traps water and causes stalling. I ditch it and end the vent tube a few inches above it, in the motor's wake.



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  3. #3
    Member roamineye's Avatar
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    Quote Originally Posted by lizrdbrth View Post
    The j-tube is for the carb vent. It's supposed to have another piece of tubing on the south end of it, but no one's ever seen one cuz they fall off 10 miles from the showroom. Without it the j-tube traps water and causes stalling. I ditch it and end the vent tube a few inches above it, in the motor's wake.




    Thanks - I'll have to have a look at my vent tube. Not sure where it is right now!
    1988 Yamaha TW200

    2007 Honda ST1300A

    2008 Suzuki DR650




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  5. #4
    Member roamineye's Avatar
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    Anyone have any ideas on the cam chain tensioner?
    1988 Yamaha TW200

    2007 Honda ST1300A

    2008 Suzuki DR650




  6. #5
    Senior Member lizrdbrth's Avatar
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    Quote Originally Posted by Roamineye View Post
    Anyone have any ideas on the cam chain tensioner?


    Service manual. Section 3, page 5. Download info on the site.



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  7. #6
    Member roamineye's Avatar
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    Quote Originally Posted by lizrdbrth View Post
    Service manual. Section 3, page 5. Download info on the site.




    Thanks - appreciate all the support
    1988 Yamaha TW200

    2007 Honda ST1300A

    2008 Suzuki DR650




  8. #7
    Senior Member sinophilia's Avatar
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    You can also adjust the tensioner with the engine running - this way you will see the rod moving in and out, you can adjust it so that you can feel it with your finger.
    Red Max - 1996 TW200 - 14/45, 320mm toothed brake disc, X-Racing titanium exhaust, Ricochet skid plate, Mule hitch pins, large pegs, VeeRubber VRM274&275 tires

  9. #8
    Member roamineye's Avatar
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    Thanks - downloaded the maintenance manual and got it done with no problems. Also checked valve lash, but the bike has only 1350 miles on it, and no adjustment was necessary. Rough idle and inconsistent idle speed is still an issue. I'm running some sea foam in the gas and this has helped, but I think I'll end up pulling the carb and inspecting it.
    1988 Yamaha TW200

    2007 Honda ST1300A

    2008 Suzuki DR650




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