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#5801 Re: Dong Fang DF 250 RTB Bobber Information
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#5802 Re: Dong Fang DF 250 RTB Bobber Information05-01-2016, 07:58 PM
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
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
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#5803 Re: Dong Fang DF 250 RTB Bobber Information05-01-2016, 08:12 PM
http://www.scooterparts4less.com/web...ust_gasket.htm
Measure the exhaust port and select size from chart above.Vince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
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#5804 Re: Dong Fang DF 250 RTB Bobber Information05-02-2016, 01:57 AM
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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#5805 Re: Dong Fang DF 250 RTB Bobber Information
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#5806 Re: Dong Fang DF 250 RTB Bobber Information05-02-2016, 02:10 AM
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
1998 XVS650 (For Sale)
2003 LS650 with Voodoo Vintage hardtail
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#5807 Re: Dong Fang DF 250 RTB Bobber Information05-02-2016, 11:53 AM
bow,
Too bad we didn't suggest a compression test before the head was removed.Vince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
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#5808 Re: Dong Fang DF 250 RTB Bobber Information05-02-2016, 12:10 PM
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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#5809 Re: Dong Fang DF 250 RTB Bobber Information05-02-2016, 12:51 PM
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
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
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#5810 Re: Dong Fang DF 250 RTB Bobber Information05-02-2016, 03:10 PM
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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