Dong Fang DF 250 RTB Bobber Information

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Originally Posted by barnone

Gun,
Looking good. Like those bars with the pull back. Did you post where you got them?
Regarding your head light, did you check the switch on the right side of the handle bars. Mine is working the way I want with the head light off and the small bulb on with the switch in the middle position. With the switch all the way to the left then the headlight is on.

If it is not the switch then check the blue/white wires under the tank.

What bags on the back?

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Flanders - Bars
Better photosAttachment 5665Attachment 5666Attachment 5667Attachment 5668Attachment 5669

thnx bar 5/8X1/4 520 chain now just need to dig up a 36 tooth (have 15/42 now , redlines at 70ish)

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Originally Posted by DanDaMan

thnx bar 5/8X1/4 520 chain now just need to dig up a 36 tooth (have 15/42 now , redlines at 70ish)

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Dan,
You said earlier " bolted up but teeth were to narrow to fit into the chain , any idea's how to determin type of chain I have ?"

Did you mean that the teeth were too wide to fit in the chain?

BTW, The DF has a 520 chain. Better check your measurement.

Go to http://www.gizmology.net/sprockets.htm for more information on how to measure your chain.

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Originally Posted by DanDaMan

glad to see someone else go to the gearing extremes im going for and that your getting the speeds I was expecting

but I'm still having 2 problems

1) even though my chopper has the same motor , the sprocket linked by barnone didnt fit : ( , bolted up but teeth were to narrow to fit into the chain , any idea's how to determin type of chain I have ?

2) I installed a 112 main jet , did wonders for top end power , but am still leaning out a bit near top speed (plug white with the faintest ting of tan) (prob that air ram i installed :p ) , would increasing my pilot and needle jets slightly help toward riching up 75-90% throttle ?

just broke 800 highway miles on my lil bike but need another 10-15 mph to really make highway runs more comfortable

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Have a look at this.It may help.I can't remember if the DF has a pumper or a cv carb. http://www.factorypro.com/tech_tunin...m_engines.html

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Originally Posted by ben2go

Have a look at this.It may help.I can't remember if the DF has a pumper or a cv carb. http://www.factorypro.com/tech_tunin...m_engines.html

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The DF has a PZ30 pumper so go to http://walbro.com/brochurefiles/3368...g%20Manual.pdf
Don't know what carb DanDaMan's bike has on it.

I prefer a pumper carb on a single.

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Originally Posted by DanDaMan

glad to see someone else go to the gearing extremes im going for and that your getting the speeds I was expecting

but I'm still having 2 problems

1) even though my chopper has the same motor , the sprocket linked by barnone didnt fit : ( , bolted up but teeth were to narrow to fit into the chain , any idea's how to determin type of chain I have ?

2) I installed a 112 main jet , did wonders for top end power , but am still leaning out a bit near top speed (plug white with the faintest ting of tan) (prob that air ram i installed :p ) , would increasing my pilot and needle jets slightly help toward riching up 75-90% throttle ?

just broke 800 highway miles on my lil bike but need another 10-15 mph to really make highway runs more comfortable

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look at your chain really good, my chain has the number 520 engraved on some of the links, some links have KMC, some links have IZ, some links have 520, and the rest are just blank.

Sense we're on the subject. Installing the new chain yesterday, I used EK's patented Screw Type Connecting Link. No riveting or clip.
It comes with extra long shafts that are threaded half way. After inserting, put plate on and finger tight nuts provided. 5/16 wrench start equally torqing down. Once it bottoms, you break off threaded shafts. Must work like a plumbing compression fitting. Clean look & reported to be as strong as a riveted link without the hasel.

also have pumper carb , looking at links I did find a link with a number stamp , 428H JE KMC, ..... well atleast I know what to order now (engine/carbs seem to be an exact match between your bobbers n my chopper , and had all of the same electrical issues listed earlier in the thread as well (solved by simply installing new rectifier ) oddly enough 428 is a match for the honda CG 125 that the motor is derived from

still have the a bit lean problem at mostly open throttle , 45 pilot(stock) dunno about needle jet size but have 2 washers on it and 112 main , still lean but at least there is the very faintest tinge of tan wer as be4 with the 88 it was always bone white (used a bit of 180degree ( U shaped) radiator tubing to reposition airfilter from rear facing out into the airstream and forward facing)

but I have read that ALL 3 jets effect WOT , and was wondering if up sizing pilot n needle jets might solve my issues /shrug there cheap enough trial n error may not hurt , gunna go up 1 size on my pilot n 2 on needle n post my results

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Originally Posted by GUN ROD

Sense we're on the subject. Installing the new chain yesterday, I used EK's patented Screw Type Connecting Link. No riveting or clip.
It comes with extra long shafts that are threaded half way. After inserting, put plate on and finger tight nuts provided. 5/16 wrench start equally torqing down. Once it bottoms, you break off threaded shafts. Must work like a plumbing compression fitting. Clean look & reported to be as strong as a riveted link without the hasel.

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You have a link to that?I'm replace a DID O ring chain on one of my bikes soon.That maybe an option for me since the bike is't getting but maybe 35 hp to the rear wheel.