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#5011 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Dec 2013
- Location
- TX
- Posts
- 92
06-12-2014, 11:44 AMI'm running a Mikuni 30mm VM series. It's not a pumper so I just layed the extra bit of cable up under the tank. That did not solve the backfire issue so many of us have. I am running the stock jets. I have also replaced the CDI, coil, and plug with "hi performance" units. That did not help either. Just for the heck of it, I'm desiginig a signal conditioner for the line from the pulse coil to the CDI.
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#5012 Re: Dong Fang DF 250 RTB Bobber Information06-12-2014, 12:03 PMVince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
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#5013 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Dec 2013
- Location
- TX
- Posts
- 92
06-12-2014, 12:24 PMMiss, backfire through carb, rough idle. Also at roll on and steady speed. Hot or cold. Load or no load. Since it came out of the case. 2012 Installed new fuel filter at PDI and changed at 50 mi. Bike has less than 100mi. I've seen several posts concerning carb problems. I did rejet the stock carb (110). Plug is tan like it should be. Not a mech so I'm guessing maybe valves - haven't checked them but will when I get a few more miles on her. Emmisions crap is gone and hole plugged. Did leave the crankcase breather on but it is exposed to the air as I installed a new air filter of about the same surface area.
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#5014 Re: Dong Fang DF 250 RTB Bobber Information06-12-2014, 12:53 PM
Neither of my two DFs had/have this problem you are describing. The stock DF should not be backfiring through the carb. Yep, there are a lot of posts considering carb problems, probably most caused by the owners.
I just fixed one I caused.
What model DF? How about adding it to your signature line?
Maybe an air leak causing the backfiring. Do you have good o rings on the carb manifold? Your DF should not need a 110 main jet. A 105 should be plenty big.
What was wrong with the stock carb and CDI,coil,etc? Don't just start changing parts out. I'd put it all back stock and start over.Vince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
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#5015 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Dec 2013
- Location
- TX
- Posts
- 92
06-12-2014, 01:14 PMThis issue was there with the stock parts also. The CDI did seem to help power at mid to high range because of the 4 degree advance, I would say. I always install new ignition parts on new Chinese bikes and scooters. Probably a head trip, but I feel like the aftermarket parts are a little more reilable and they don't cost that much. I did reinstall the factory carb and main jet, CDI, and coil and nothing changed so I changed them back. As for the stock carb, I like the simplicity and quality of the Mikuni. Nothing got worse with the changes - power a little better. My next step is to squirt starter fluid at the manifold and carb connections. Just not sure what the stuff will do to the paint. I've heard some use WD40 for that test. It's a 2012 "B". Rear sprocket is 35T. Took out links to keep the fender clear of the tire. My back ground is electronic design and all the electronics stuffed into that little can with no sheilded wires bother me a little. Probably won't do much good but I still may look at cleaning up the line to the CDI input. Heck, it's a hobby.
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#5016 Re: Dong Fang DF 250 RTB Bobber Information06-12-2014, 01:23 PM
All I can say is that my 2012 DF is all stock except for the rear sprocket change and air injection system removal and does not do the backfiring that you are describing.
Vince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
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#5017 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Dec 2013
- Location
- TX
- Posts
- 92
06-12-2014, 01:25 PMI'll play with it awhile and post when I figure it out. Thanks for the input.
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#5018 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Aug 2011
- Location
- texas
- Posts
- 266
06-12-2014, 11:51 PMya sounds like u need to adjust your valves - baring a airleak
2010 dong 250 cha chopper 15-33 spockets car rear tire , 110 main jet - 90% highway use Austin tx
77 gs 750 susuki
so u did get another 1 Barnone ? awesomeLast edited by DanDaMan; 06-14-2014 at 08:24 AM.
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#5019 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Dec 2013
- Location
- TX
- Posts
- 92
06-13-2014, 12:26 AMJust found out that I blew out the plug I put in the emissions outlet that comes off the block. Repaired that and re tuned the carb. It's much improved but I still have the miss so I'll do the valves this weekend. .002 amd .004 if I remember correctly. I had a truck cut the corner and put me down so I'm also gonna change the oil just in case I had fuel leak into the oil sump while she was on her side. She was down for a min til they picked up the bike off of me. Some drivers forget what they're doing whe they see the bobber. Live in the DFW area so dumb drivers are the rule here. Loved Austin when I was there. Should have stayed.
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#5020 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Aug 2011
- Location
- texas
- Posts
- 266
06-14-2014, 08:14 AM
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