Dong Fang DF 250 RTB Bobber Information

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Originally Posted by Crelow

Hey Churk,

I'm still around reading post. I just haven't been able to save enough to buy new tank. But as you know here in fl I can ride year round. So I'm just tring to get the bike paid off. I said that before and just kept buying things. So now that I can't ride I'm sticking to my guns and paying it off. My brother had me pull it out the other day so his daughter could take a picture with it. But I still come read post I just don't comment as much because I don't have the bike running. But soon as I get tank and battery ill be posting photos and writing more. Till then I'm listening.

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Mine is leaking also Crelow,

I called scooterdepot to see how much a replacement would cost. Somebody earlier mentioned $75. When I called them they said they dont make the old treardrop tank anymore so I would have to order the new tank that comes with the B model and it would cost me $130 and I would have to drill some holes on my frame to mount it. It's 1.8 gals and IIRC its bigger than the original so that's better for me.

I may call them tomorrow and just put the damn thing on my CC. The sooner I get this fixed the better. Hope they have it in silver.

well these responses worry me a bit... i also specifically told them what it was and asked for high temp hose... first was gates for sure, and both went quick...
i was expecting you all would tell me i have to use a Steele line or something...

well i cant imagine im burning that hot so it must been the wrong hoses.
ill try again for no other reason than id like to do other things than retune the carb if i block it off... but that a fine compramise... though id like to get the the bottom of it first

anyone ever consider getting a fatter wheel on the rear?
im thinking it might have a good look...

our wheels are 170/70r18, which comes out to a 5.25-5.5" wide wheel.
having what appears to be perhaps 3.75" (wide) rear rim, not sure but, initial research indicates we could take a 150 or perhaps 160 wide wheel with a lower aspect ratio, maybe 60, to give a similar ~26" diameter.
i measured the rear fender, it has a 6" wide mouth and considering this is a hard tail and the fattest part of the wheel wouldn't never travel any closer into the wheel-well i think a 160/60 may be possible...

not that i think would waste money to do this, especially when i have a perfectly fine tire, but it intrigues me

now i don't know if i will ever wear out the rear tire, but if i do, ill be sure to give this a shot.
but i was just curios if anyone else into vanity has tried this already...

"0.3125""(8mm) ID High Performance Silicone Vacuum Hose, Black"-Flex Technologies

You might want to look into this type of hose.

As far as tire size... Do Not forget rear frame to axle measurement.

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Originally Posted by axa

anyone ever consider getting a fatter wheel on the rear?
im thinking it might have a good look......

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haha , I put a car tire on rear :p , Fat as hell , But my bike is so custom now its hardly recognizable , and its the chopper version , but all electrical and mechanically the same


and that hose should NOT be getting hot , because fresh cold air should be blasting into the motor via that
1) either your air pump isnt functioning
or
2) your vacume hose to the manifold (what carb bolts to) is bad , making the air pump malfunction





ps , how do I post a pic ?

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Originally Posted by axa

anyone ever consider getting a fatter wheel on the rear?
im thinking it might have a good look...

our wheels are 170/70r18, which comes out to a 5.25-5.5" wide wheel.
having what appears to be perhaps 3.75" (wide) rear rim, not sure but, initial research indicates we could take a 150 or perhaps 160 wide wheel with a lower aspect ratio, maybe 60, to give a similar ~26" diameter.
i measured the rear fender, it has a 6" wide mouth and considering this is a hard tail and the fattest part of the wheel wouldn't never travel any closer into the wheel-well i think a 160/60 may be possible...

not that i think would waste money to do this, especially when i have a perfectly fine tire, but it intrigues me

now i don't know if i will ever wear out the rear tire, but if i do, ill be sure to give this a shot.
but i was just curios if anyone else into vanity has tried this already...

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The rim size should be stamped on the rim somewhere.I would use that number and the tire manufactures recommended rim fitment sizes.Motorcycle tires can roll the bead off the rim if the wrong size tire is installed.I wouldn't want to see someone get hurt or killed due to this.

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Originally Posted by DanDaMan

haha , I put a car tire on rear :p , Fat as hell

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what size is your car tire?

205 / 65

and it being a hard tail , I would NOT go with a smaller tire profile , its the only "shocks" you have on the rear

but can change the profile for the front SLIGHTLY to get the speedo more accurate

it reads about 10% fast , so increase the profile by about that and speedo be near dead on

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Originally Posted by DanDaMan

205 / 65

and it being a hard tail , I would NOT go with a smaller tire profile , its the only "shocks" you have on the rear

but can change the profile for the front SLIGHTLY to get the speedo more accurate

it reads about 10% fast , so increase the profile by about that and speedo be near dead on

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wait a minute, you squeezed in a 205 on this bike? or chopped your frame perhaps?!?

Ive gotta see this.
To post a pic go to the Settings on the top of the page, scroll down to the "General Settings" and change the message editor settings until you get one that works for your browser...

Its funny i was just going to post pics to show you how to do it, when i realized i cant post from work cuz my browser set up... hmm

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Originally Posted by DanDaMan

haha , I put a car tire on rear :p , Fat as hell , But my bike is so custom now its hardly recognizable , and its the chopper version , but all electrical and mechanically the same


and that hose should NOT be getting hot , because fresh cold air should be blasting into the motor via that
1) either your air pump isnt functioning
or
2) your vacume hose to the manifold (what carb bolts to) is bad , making the air pump malfunction

ps , how do I post a pic ?

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I too was thinking something is blocked, cuz ive been blowing the same quality American hoses that GonzoX is using successfully.
Before this started happening i was getting a decent vacuum, so i figured when I read another post of the same problem, the problem was the Chinese made hose...

That said, if the pump comes off for a check, i doubt its going back on...

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Originally Posted by ben2go

The rim size should be stamped on the rim somewhere.I would use that number and the tire manufactures recommended rim fitment sizes.Motorcycle tires can roll the bead off the rim if the wrong size tire is installed.I wouldn't want to see someone get hurt or killed due to this.

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surely I would match the rim to tire.
out of curiosity im going to check the rim for actual specs...
but our cst tire states a recommended rim size of 3.75, which is more or less what i measured manually of the rim.

So when i looked up the proper rim width/tire width match, it noted the 160 was a valid combination.
then changing the ratio to 60, you can match the over all diameter of the original.

Then of course we could always change the rim...
which is apparently what Dan has done.
cuz i didnt bother to measure between rear forks, but I didn't imagine a 205 could fit ever. therefore really i hope Dan can manage to post the pics.

Axa , if you read above , I have the Chopper , but its same mechanically and electrically , and theres no forum for the chopper , so I am here

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I had around 150 miles on mine before I took the pump off and the hose to the head was perfect, sounds like you have some mini muffler action going on to me. Maybe they hooked it up backwards and it's sucking out exaust and blowing it into your carb.

I did the head light fix today. Mine being a 2012 and with different controls than the 2010 I hoped that they had resolved the issue, but no. Mine was bright in idle but as soon as you get the revs up it'd dim. Took the tank off and found the blue and white stripe hooked to the dark green. There was no nub of the other end of the blue and white to be found so I folded the green wire under and hooked up the blue and white to the black (Ground) coming off the ignition switch. Comes on when I turn the key and stays bright under load. Yeah

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Originally Posted by Bob form NV

I had around 150 miles on mine before I took the pump off and the hose to the head was perfect, sounds like you have some mini muffler action going on to me. Maybe they hooked it up backwards and it's sucking out exaust and blowing it into your carb.

I did the head light fix today. Mine being a 2012 and with different controls than the 2010 I hoped that they had resolved the issue, but no. Mine was bright in idle but as soon as you get the revs up it'd dim. Took the tank off and found the blue and white stripe hooked to the dark green. There was no nub of the other end of the blue and white to be found so I folded the green wire under and hooked up the blue and white to the black (Ground) coming off the ignition switch. Comes on when I turn the key and stays bright under load. Yeah

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Yea, i took my first nite ride last nite, scared the shit out of me... first of all the headlight was dim as you say. On coming cars would drown my light from 100 yards.
And not being able to see that far ahead, with these springers, things creep up on you until BAMMM!
I love the look of these springers, but hate the feel...

Anyway, the wiring is funny indeed. dim and then when you squeeze the brake light the headlight brightens...

So it seems you are bypassing that ac generator/regulator thingy, and driving the headlight strait from the battery.
I would just be concerned with having it like that. if i were to try to start in the cold, when my battery has begun to wear down from age, will i get stranded... but maybe thats not an issue if your not in the cold..

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Originally Posted by DanDaMan

Axa , if you read above , I have the Chopper , but its same mechanically and electrically , and theres no forum for the chopper , so I am here

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its all good.
well you weren't kidding were you...
I was looking at the chopper at some point, and saw even the frame is a similar design, but it cant be the same is it?

those are some seat spring and forward control mods you got there.

im going to mill out some new shift linkage, i find mine a bit loose.
but thats about as far as ill go for now...

ya , I am 6ft 5inch , even on a 1977 suzuki GS 750 , or a 1980 honda CB 750 F super sport , or the 1975 kawasaki KZ 1000 , I make em all look like mini bikes , so I might as well actually ride a mini bike

the top of the seat even with my 3" spring mod is lower than my knee

and the sissybar is so I ride "recliner" style , seriously , sit in a recliner , kick your feet up , and lay back as far as possible , thats my riding position atop the slightly underinflated car tire

crelow- thanks for using the pic of my bike. it is an honor.

for sale: used sais for dfrtb. works fine. make offer. will swap for springer front end.

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Originally Posted by chruk bashre

crelow- thanks for using the pic of my bike. it is an honor.

axa-how did your hose pop off? how fast were you going? did it burst or what else happened to it? nothing you report makes sense concerning the hose. they melt?
you must have something working or how else did you go night riding?. how about a photo of the mess. i would like to see how it melts. same as bobformnv, i never had trouble with my hose popping off or bursting or ripping. certainly no melting.never a problem.. so tell us exactly what you did to start this mess so it can get fixed.

for sale: used sais for dfrtb. works fine. make offer. will swap for springer front end.

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Chuck, im just as perplexed as you are, while riding after a good 15 min warm up, twice i blew out quality American hoses. and another decent looking hose a second time.

Blew out rather than melting perhaps, BUT since I was riding and the hole would just get bigger and bigger till it almost split, I really assumed at the time it was melting.

So i dismantled the ENTIRE pump last nite. And now understand how this thing should work...
It was new and clean as one would expect on a new bike, nothing stuck or corroded...

So there i was blowing and sucking on it like a Patpong hooker...
The only puzzling thing i found was the pressure of the spring on the output valve, and how small that output valve is.
It seemed to be about 5 to 10lb spring, at first observation i thought a bit heavy for an air system, nothing i could over come with lungs pressure anyway.

Honestly i don't quite understand where the pressure or the vacuum would built to open this valve.
One side has an open passage to the fresh air intake, and the other side being a needle passage to the primary intake...
The system would make sense if the spring was much weaker, but not with the strength the spring has.

So now that this has been investigated, the only possibilities i received 3 bad hoses or that spring is just out of spec...

I find it implausible that I got 3 bad hoses, i don't imagine finding a proper replacement spring, and as far as i know it really doesn't matter, so ill just cap the system off.

It would be interested for me if you or anyone with a working pump would just push in the valve and see what kind of strength it has. it can easily be accessed without dismantle but pushing a screw driver through the fresh air hose opening

I did also check the plug, and it was a bit black along the base rather than white so i assume im not running lean and hot...

Sorry i didn't take any pics, i was thinking of doing that at the time but not sure anyone would be interested... which is really a silly thing to think on this forum...

ill have to consider swappi9ng the secondary for the springers... :>

axa so what happened to the original hose? it broke? or did you change it out before really using it meaning fixing something that wasnt broke. just have to know every detail in order to troubleshoot. how about a hose clamp to hold it down if the pinch clamp doesnt work. PICS.

bobformNV- hows about some how-to page on valve adjustment?

All you want to know about running car tires on a motorcycle. http://darkside.nwff.info/?p=tires

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Originally Posted by chruk bashre

bobformNV- hows about some how-to page on valve adjustment? what did you go by? where are the directions. (dont tell my wife i was asking for directions)

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chruk this link was taken from Dandamans mods list.

valve adjust - https://docs.google.com/file/d/0ByFv.../edit?hl=en_US = compression stroke = both valves fully raised

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Originally Posted by chruk bashre

axa so what happened to the original hose? it broke? or did you change it out before really using it meaning fixing something that wasnt broke. just have to know every detail in order to troubleshoot. how about a hose clamp to hold it down if the pinch clamp doesnt work. PICS.

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not at all. the original hose was the first to blow at 30 (indicated) miles.
changed it for the gates and that blew at around 50 miles.
got another 'fuel line hose at 60, that didnt last down the street.

it seems to drive fairly well enough when its blown.
In fact i initially got the feeling i had a slight increase in top end. cant be sure though.

Now the entire secondary air intake is off, im going to cap it off as soon as i get the chance.
but hope this doesn't end up having been something else entirely.

sorry about no pix, i really should have. at the time i thought it was likely a simple issue

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Originally Posted by ben2go

All you want to know about running car tires on a motorcycle. http://darkside.nwff.info/?p=tires

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where the dfrtb listed!?
:riding:

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Originally Posted by chruk bashre

crelow- thanks for using the pic of my bike. it is an honor.

axa-how did your hose pop off? how fast were you going? did it burst or what else happened to it? nothing you report makes sense concerning the hose. they melt?
you must have something working or how else did you go night riding?. how about a photo of the mess. i would like to see how it melts. same as bobformnv, i never had trouble with my hose popping off or bursting or ripping. certainly no melting.never a problem.. so tell us exactly what you did to start this mess so it can get fixed.

for sale: used sais for dfrtb. works fine. make offer. will swap for springer front end.

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FWIW in my case my hose did not melt, it burst. I was doing max speed 60mhp on the hwy at full throttle when it happened. And as I stated before, I will never get on the hwy again. It's 75mph limit on there and most cars do 80. Here I was straining to keep it at 60 to keep from getting run over LOL. Never again.

This is why Im seriously thinking about getting a Royal Enfield. 6K for a 500cc and I read it does 70 tops so I would still have a light bike. But I think it would be a world of difference over the -250cc in my DF.

delete......

:popcorn:

ive not done it myself , not had to , but start with the smallest screws availabl so u can move to bigger n better as it slowly wallers out

use a brand new metal drill bit , smaller than the screws u bought


and im not sure but AXA might have a bad MAIN from the intake manifold (bit carb bolted to) to the air pump , or asothers have said have it bolted backwards

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Originally Posted by DanDaMan

ive not done it myself , not had to , but start with the smallest screws availabl so u can move to bigger n better as it slowly wallers out

use a brand new metal drill bit , smaller than the screws u bought


and im not sure but AXA might have a bad MAIN from the intake manifold (bit carb bolted to) to the air pump , or asothers have said have it bolted backwards

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If I understand what ur talking about, I can't imagine that primary air intake tube was bolted on backward but I'll take some pics.
Maybe it's just me, but without that smog pump I kind of find the engine compartment bare

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Originally Posted by axa

If I understand what ur talking about, I can't imagine that primary air intake tube was bolted on backward but I'll take some pics.
Maybe it's just me, but without that smog pump I kind of find the engine compartment bare

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bare you mean like this?

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