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  1. #5801 Re: Dong Fang DF 250 RTB Bobber Information 
    C-Moto Guru ben2go's Avatar
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    Quote Originally Posted by bowtiewagon View Post
    ben, I have been trying to find a new gasket for the exhaust but the three I purchased thinking they were it, were to small. have not had any luck with descritions and these sellers answering back.
    Try to match it up at a dealer, and then see what online prices are going for on the same P/N.
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  2. #5802 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru barnone's Avatar
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    The gasket does not look that good to me but I am miles away.
    Check your head for flatness https://www.youtube.com/watch?v=qCMZGaLSO8w You can use a piece of flat glass for the flat surface.
    If you can get the rear wheel off the ground then put the bike in gear and turn the wheel and listen for noise.
    Vince
    2009 Suzuki TU250X
    2012 Royal Enfield with Cozy sidecar
    2018 Dong Fang DF250RTG
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  3. #5803 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru barnone's Avatar
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    http://www.scooterparts4less.com/web...ust_gasket.htm

    Measure the exhaust port and select size from chart above.
    Vince
    2009 Suzuki TU250X
    2012 Royal Enfield with Cozy sidecar
    2018 Dong Fang DF250RTG
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  4. #5804 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
    also would this be tha same.. it says for a CG250, but it looks the same. http://www.ebay.com/itm/160293568896...%3AMEBIDX%3AIT
    this gasket is fine. i think i bought from the same guy some time ago.
    heres a cheaper one with bottom end gasket included

    http://www.ebay.com/itm/191242927459...%3AMEBIDX%3AIT
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  5. #5805 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru axa's Avatar
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    Quote Originally Posted by barnone View Post
    http://www.scooterparts4less.com/web...ust_gasket.htm

    Measure the exhaust port and select size from chart above.
    I often use rolled up tin foil, but this is a decent deal.
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  6. #5806 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru axa's Avatar
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    Quote Originally Posted by ben2go View Post
    No signs of a bad head gasket.I would replace it just to be safe.The sound in the video sounds like an exhaust leak between the header and head.I would replace that gasket as well.The intermittent running could be a coil,pick up,or CDI starting to fail.They all do wierd things when they start to go out.

    I have to agree it doesn't 'appear' to be at all damaged. Mine looked like it was blown out about an inch in the circumference. i speculate i under tightened the the head bolts as i didnt take the time to get the specs.

    But what I should have suggested is try to get a sense of where the leak was (by putting your hand around a pumping head) preferably before it stopped running for good.

    now again supposing it is a head gasket leak cuz u stated power loss (and not a exhaust leak where you wouldn't lose much power just backfire alot) you must check for flatness.
    If you cant find a warp, you will need to clean it up with acetone, seal it back in place, and see where the leak might still be, you might just get lucky and the problem gone.
    (Its not beyond comprehension that your bolts just loosened up)
    but be sure to let me know if you find either your mating surfaces, head or cylinder, warped.

    But take your time to try and isolate if speculation has been utterly inaccurate thus far.
    Last edited by axa; 05-02-2016 at 11:09 AM.
    2012 DF250RTB_B with Yamaha XV250 V-twin
    2018 DF250RTG
    1998 XVS650 (For Sale)
    2003 LS650 with Voodoo Vintage hardtail
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  7. #5807 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru barnone's Avatar
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    bow,
    Too bad we didn't suggest a compression test before the head was removed.
    Vince
    2009 Suzuki TU250X
    2012 Royal Enfield with Cozy sidecar
    2018 Dong Fang DF250RTG
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  8. #5808 Re: Dong Fang DF 250 RTB Bobber Information 
    C-Moto Guru bowtiewagon's Avatar
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    I ordered the head gasket. Also the exhaust gasket. Problem I have with all this is that when it was running during the video I showed, I was getting smoke out the exhaust. I have never had smoke out the exhaust before this. Plus puffs out the intake filter as well when i shut it off. Thats is what lead me to believe it may have to do with the timing more than anything. once the gaskets arrive (botht of them. I will get it back together and hope we are good, and keep ya posted. Thanks again all.. very helpful.
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  9. #5809 Re: Dong Fang DF 250 RTB Bobber Information 
    Senior C-Moto Guru barnone's Avatar
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    bow,
    Not so sure that you had a bad head gasket. From original post

    "Was in the process of pulling out of a driveway from work, put her into first, large dathunk ,stalled, hard to restart, got her going and no power at all, stalled again, and would not start .."

    I suggest you turn the engine over before you put the head back on and listen for noise.

    Put the bike up on blocks so the back wheel is off the ground, put the bike in gear, and have someone rotate the back tire and listen for noise close to the engine.

    Also check the head for flatness before you reinstall it.
    Last edited by barnone; 05-02-2016 at 01:42 PM.
    Vince
    2009 Suzuki TU250X
    2012 Royal Enfield with Cozy sidecar
    2018 Dong Fang DF250RTG
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  10. #5810 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
    I ordered the head gasket. Also the exhaust gasket. Problem I have with all this is that when it was running during the video I showed, I was getting smoke out the exhaust. I have never had smoke out the exhaust before this. Plus puffs out the intake filter as well when i shut it off. Thats is what lead me to believe it may have to do with the timing more than anything. once the gaskets arrive (botht of them. I will get it back together and hope we are good, and keep ya posted. Thanks again all.. very helpful.
    yup a compression test would often be a prerequisite, but honestly i don't have the tool and never see myself getting one.

    but going off the "no power" part of the statement, i do think that much of a leak would be noticeable whether its a hole in the combustion chamber (gasket or otherwise), or worn piston rings causing blow by.

    anyway, its easy to jump to conclusions; efficient diagnosis is really a methodical process.
    ill be sorry if this all ends up to be a leaking exhaust gasket causing a big change in the combustion mix... but ive run with out a gasket and the worst of it is severe backfire, the accumulating smoke at stop lights was unsettling as well.
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