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  1. #1
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    TAV2 clone issue

    So I've had my bike together for a couple weeks, maybe has an hour on it, tops. 212 predator backed with a knock off TAV2 from OMB. 12/54 gearing on a stretched DB30, 15x6-6 rear tire.

    When I first got it together, the TAV would drag at idle and rotate the back tire slightly. Pulleys are aligned, and belt is in the correct direction. I ultimately attributed this to a new, tight belt. Upon inspection I noticed some amount of bronze dust, and assumed it was simply braking in. Looking at it today, as I was getting ready to order a new driven spring, the bronze bushing on the drive side is gone. I guess there was more bronze dust than I realized.

    What would cause this? Belt too tight? I imagine it is a wear item, however I only have an hour on it, on pavement.
    Is the bushing necessary? I see the 1" drive unit does not use a bushing.

    Thanks
    Dave

  2. #2
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    I just had to buy a some these bushings. My buddy ate one up on his bike. I've bought a few tavs off ebay and the quality control is not the best. I would run it off the ground and really see how th tav is operating. My friends tav has a wobbly driver pulley which is eating his bushings and causing vibration.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  3. #3
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    These also never come with enough spacers, I use a straight edge to line up the pullies for the belt and always need to add extras.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  4. #4
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    Thanks. Pulleys are aligned. I will say there is some runout on the driver, and some vibration at idle. I have plenty of full scale toys but this is my first mini bike. I would expect some vibration from a rigid mounted single cylinder, but I don't have a good feeling for what is acceptable/excessive.

  5. #5
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    I took some quick measurements before I left for work. Didn't have an ideal setup...but good enough for what I was looking for.

    The outside of the inner pulley surface on the driver had 0.014" runout, while the "snout" had 0.002-0.003".

    IMG_2701.JPG
    IMG_2703.JPG

    The Driven had 0.010" on the inner outside surface.

    IMG_2702.JPG

    I didn't get a chance to run it to quantify the "wobble"
    Last edited by OUTLAWD; 09-14-2017 at 08:58 AM.

  6. #6
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    I think there are members who have said they run their TAV 30's without the bushing.

    The way that appears to operate is that the bushing protects the belt at idle. Basically prevents unwanted partial engagement at idle. You would think that without the bushing in place there is more "breathing" room for the unengaged belt at idle. Something you can look at closely with the wheel off the ground.

  7. #7
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    You need to use dry lube on inside of bushing. Comet sells it or get dry molybdenum spray. Bushing is there so it does not drag at idle.
    Ole

  8. #8
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    I have new bushings on order...no one local had them in stock...once I get a Comet replacement, I will measure it and order more from an industrial supplier at $1/ea rather than $5/ea

    That being said, I threw it back together sans bushing, and it worked fine, and didn't drag at idle. Maybe the chinese belt is too tight...I ordered some Bando kevlar belts.

 

 

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