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  1. #5811 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru barnone's Avatar
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    I've used my compression tester like this one below many times over the years. Should be done before tearing into an engine.

    http://www.ebay.com/itm/Professional...-/321971101392

    Maybe one can be borrowed from a auto parts store.

    Really doubt this problem is caused by the leaking exhaust gasket.

    The cause of the "loud dathunk " needs to be found.
    Vince
    2009 Suzuki TU250X
    2018 Dong Fang DF250RTG
    2019 Ice Bear CT70 Clone
    2020 Ice Bear 150cc Scooter
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  2. #5812 Re: Dong Fang DF 250 RTB Bobber Information 
    C-Moto Guru ben2go's Avatar
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    I wonder if a valve adjuster backed off enough to not open the valve properly.
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  3. #5813 Re: Dong Fang DF 250 RTB Bobber Information 
    C-Moto Guru bowtiewagon's Avatar
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    I am pretty sure the adjusters are tight. but once I get her back together I will triple check the gap.
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  4. #5814 Re: Dong Fang DF 250 RTB Bobber Information 
    C-Moto Guru bowtiewagon's Avatar
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    If I could reach into this forum and give every one of you a firm hand shake I would. I want to thank each of you for the awesome assistance for helping me get my baby back on the road. Head gasket it was.. so it seems. It came in yesterday, I put her all back together today, and took her for a nice ride. She is practicaly new feeling. You are all the best. I have learned much from each of you, and hope we can all continue to support each other through our coming rides. Peace and respect and a hearty thanks.
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  5. #5815 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru axa's Avatar
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    Quote Originally Posted by bowtiewagon View Post
    If I could reach into this forum and give every one of you a firm hand shake I would. I want to thank each of you for the awesome assistance for helping me get my baby back on the road. Head gasket it was.. so it seems. It came in yesterday, I put her all back together today, and took her for a nice ride. She is practicaly new feeling. You are all the best. I have learned much from each of you, and hope we can all continue to support each other through our coming rides. Peace and respect and a hearty thanks.
    im real glad for u. and just think, you guys were this close to picking out a new engine.

    did you torque to about 21 ft/lbs i think i read.
    i bet it was your just your head bolts that got themselves loose over all those miles you rode.
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  6. #5816 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru barnone's Avatar
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    bow,
    Great news. May she run another 18k miles.
    Vince
    2009 Suzuki TU250X
    2018 Dong Fang DF250RTG
    2019 Ice Bear CT70 Clone
    2020 Ice Bear 150cc Scooter
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  7. #5817 Broken Sprocket Studs 
    Senior C-Moto Guru axa's Avatar
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    turns out I just broke all 4 rear sprocket kush bearing studs.
    i already know others have complained about these likely having broke them.

    I'd recommend taking the time to change them out before you run in to a problem. I've not even got 1800 miles or so.
    many thing are life threatening on a bike, might as well eliminate the ones you can.
    Last edited by axa; 05-09-2016 at 11:38 AM.
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  8. #5818 Broken Sprocket Studs 
    Senior C-Moto Guru axa's Avatar
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    i just ran a failure analysis on my sprocket bolts and found all 4 had deep and smooth beach marks covering for a majority of the shear area, leaving a fast failure on a minority of the area.
    This means that the process was long and slow, and only took a light load to break at the end (which was true as i was just pulling out of a stop)

    I cant really tell if it was just the material being shit, or if it sat in the kush bearing hole too lose movement, or if the shoulder of the bolt was turned with a too sharp angle by a dull tool which allowed the tiny smooth cracking to begin.
    But these all seem a problem, and a systemic one to Chinese manufacturing, imho everyone should swap these bolts out.
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  9. #5819 Re: Broken Sprocket Studs 
    Senior C-Moto Guru barnone's Avatar
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    http://www.ebay.com/itm/NOS-OEM-GENU...NWuR93&vxp=mtr

    Changed them out severals years ago when I changed the sprocket.
    Vince
    2009 Suzuki TU250X
    2018 Dong Fang DF250RTG
    2019 Ice Bear CT70 Clone
    2020 Ice Bear 150cc Scooter
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  10. #5820 Re: Broken Sprocket Studs 
    Senior C-Moto Guru axa's Avatar
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    Quote Originally Posted by barnone View Post
    http://www.ebay.com/itm/NOS-OEM-GENU...NWuR93&vxp=mtr

    Changed them out severals years ago when I changed the sprocket.
    thanks for the link, those show the proper rounded shoulder instead of the 90 edge the stock came with.
    i found similar sets last nite, and i turned a new set this morning before work...
    to a not for profit machinist like me, 24$ for a set of bolts seemed really outrageous

    but then there are these, 2 sets for 9$, though you'll probably end up with the same problem later.
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