Dong Fang DF 250 RTB Bobber Information

Hello NEW Bob, Big welcome to the forum! If your a true 140 a 35 tooth or maybe even a 33 may work even better...hmmm not sure you may lose too much torque though...?
Best source for a steel sprocket I found was:

http://www.jtsprockets.com/61.0.html
and plug in the JT sprocket tooth count at the end of the stock number.

For example of a 35 tooth stock number that fits is jtr279.35 they take paypal also. Mine came in just a few days.

NEVADA BOB has the exact bike.

Welcome New Bob.

Quote:

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Originally Posted by Crelow

I managed to put something together temporarily. The first set of wires the shielding started to melt because it was too small of a gauge. The second did well. Not sure if I'll be able to put in a charger as the shed has no power and the run is too far from the house. I may just remove it each time i leave out of town. Also Seen a bunch of corrosion on the bottom of the batter box due to the acid leaking. here's a video of the bike running. Does the hiccuping happen to you guys. It's partly why i cant keep it running. http://youtu.be/eheOaHZgfiA

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CRELOW Thats the same exact backfire I had. Caused by a bad air fuel mix and then an explosion of un burned gas that stops the crank/ it isn't too healthy for the engine when it explodes during exhaust cycle and stops the bike. Does it go away after its warmed up good? is your plug black and fouled/ bad spark could cause this. Unburned gas is exploding... from too lean ( too much air) or too rich ( too much fuel) either condition can cause backfiring thru carb. many web sites to help tune this pumper carb. But some trial and error is seldom avoided. Once you get it right it will run as smooth as silk

Warm the bike
Air fuel Mix screw adjust use a 1 inch long screw driver flat blade end from an interchangeable screw driver. start with the air fuel mixture screw on the side of the carb facing the engine.

Idle screw tweak( your idle sounded way high unless you were working the throttle
New gaped NGK plug

Lastly
Make sure idle jet isnt clogged
Valves could be out of adjustment
If you cant get it tuned, get help!

The link you posted does not work :(

Quote:

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Originally Posted by Goodbar

Hello NEW Bob, Big welcome to the forum! If your a true 140 a 35 tooth or maybe even a 33 may work even better...hmmm not sure you may lose too much torque though...?
Best source for a steel sprocket I found was:

http://www.jtsprockets.com/61.0.html
and plug in the JT sprocket tooth count at the end of the stock number.

For example of a 35 tooth stock number that fits is jtr279.35 they take paypal also. Mine came in just a few days.

NEVADA BOB has the exact bike.

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Yea im 140-145.. 145 is my max weight when I pump up with my lifting in the summer time heh. That link doesnt work btw

Try this one they have a new web site
http://www.jtsprockets.com/

Its for a
1974-1976 Honda CB200
Just type in that stock number in yahoo or google and lots of distributers pop up/
even old Bike barn has them as does amazon.

http://www.amazon.com/JT-Sprockets-J.../dp/B001AVVW0K

No shortage of sources

Quote:

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Originally Posted by Goodbar

CRELOW Thats the same exact backfire I had. Caused by a bad air fuel mix and then an explosion of un burned gas that stops the crank/ it isn't too healthy for the engine when it explodes during exhaust cycle and stops the bike. Does it go away after its warmed up good? is your plug black and fouled/ bad spark could cause this. Unburned gas is exploding... from too lean ( too much air) or too rich ( too much fuel) either condition can cause backfiring thru carb. many web sites to help tune this pumper carb. But some trial and error is seldom avoided. Once you get it right it will run as smooth as silk

Warm the bike
Air fuel Mix screw adjust use a 1 inch long screw driver flat blade end from an interchangeable screw driver. start with the air fuel mixture screw on the side of the carb facing the engine.

Idle screw tweak( your idle sounded way high unless you were working the throttle
New gaped NGK plug

Lastly
Make sure idle jet isnt clogged
Valves could be out of adjustment
If you cant get it tuned, get help!

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My next stop was the plug. And re tuning the carb. As suggested I'm trying to wait to do the valves. As this will take more time. I'm headed back to DC this weekend. So it may have to be put on hold till I return. That dam air mixture screw is the hardest thing to do because of its location and fat fingers.

Smooth like silk is how I want it. 44 miles on it wanna have it fixed before 100mile oil change. I have the magnet plug

Anyone else with corrosion on their battery box?

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Originally Posted by Bob form NV

Walmart has a Schumacher charger maintainer for around 20 bucks. It has a nice wire connection that you can leave permanently attached to the battery so you can plug it in while it's parked.

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I second that. Best $15 I ever spent. I have noticed that when its cold the battery dies out quick. Have to charge it. Now on a warm day it starts right up. Take note of the terminal wires, they are thin and weak. I already had one break off with rust by barely touching it (red possitive cable). Ironically the negative cable has zero rust on it and is fine. Put my own head on the positive cable and it seems OK now. Note that this is my first bike so I am a total newbie in all things motorcycle.

On a side note I finally rode my bike today. My horn went dead so I got a french replacement horn on ebay and it seems to work fine. Also noticed today that my clear coat is flaking off. No biggie. Once it's gone Ill just wax the crap out of the paint thats left underneath.

Only thing that worries me right now is the rust on the spokes. Net pretty and Im not sure how to tacle that yet. Open to suggestions. The bike sits outside as Im out of room in my garage. Arg! Even the exhaust pipe is starting to rust.

Now that I have the bike paid off Im almost ready to start modding a bit as funds permit. Im wondering which mods are the most important as far as bang for the buck. What mod is recommended above all others if you could only afford one mod?

So far only thing I have added are the NKG plug, new mirrors. replacement horn, replacement shift linkage rod and replaced a blown rubber air injection hose with a stronger US made one.

Quote:

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Originally Posted by Crelow

Anyone else with corrosion on their battery box?

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i just put my battery in a couple weeks ago when my bro was over here and he commented on how i should drill a hole and run a hose through the bottom of the box before i dont have a bottom anymore. Actually my box has a hole but its directly under the battery. I will drill another so that i can let the battery drain.