Dong Fang DF 250 RTB Bobber Information

**axa** · 09-29-2014, 06:04 PM

I sure appreciate the higher compression each day i do the long incline to work..
At the top this morning while still on the incline i read 60 indicated, im sure that never happened before.
i do have much more trouble starting even when its merely cool, like 15°C. choke doesn't seem to help much.
And when it just starts cold, its seems very labored with a very slow idle that gets much faster as it warms... i didn't notice this much difference cold to warm previously.
The starting will likely be helped with fix charging/new battery.

i really wish i had access to a dyno, id love to know exactly the power gained from stock to deck really was. in theory it should only have been 3 or 4%... I didnt expect to feel any of that, but the effects on holding speed is quite noticeable.

**GonzoX** · 09-30-2014, 05:29 AM

Originally Posted by barnone

My original battery on my 2012 lasted one year. About the same on my 2010. Not good batteries.

Same here. Autozone battery is on it's two year mark now and is still good to go. I did post a model number for the battery a while back and even posted pictures. Had to mod my battery box a bit though. And for the record, my bike is dead in the water if I disconnect the battery. Found that out the hard way.

Never changed my exhaust gasket but the bolts rattled lose one day and I had to locktight them back. Not something you want coming lose.

Sorry I haven't posted in a while. Still looking for a stupid seat cover for my 2010. Cant find one that fits.

**axa** · 09-30-2014, 08:10 AM

ya apparently it is a DC CDI, you will need to have either the battery or voltage from the regulator to charge the coil cap.
I didn't notice exactly what was hooked up when I was testing my charging circuit. leave either the battery or the regulator it will charge the cap

**axa** · 09-30-2014, 08:24 AM

my battery is surely going and may be gone, I'm looking at the "battery tender" BTL09A120C.
Though it seems to me like a real generic Chinese attempt/version/knock-off the Shorai lithium iron phosphate.

Seems to gets decent reviews , but this like many things is something that really needs to be reviewed a year or two later...

**barnone** · 09-30-2014, 12:06 PM

Originally Posted by GonzoX

Same here. Autozone battery is on it's two year mark now and is still good to go. I did post a model number for the battery a while back and even posted pictures. Had to mod my battery box a bit though. And for the record, my bike is dead in the water if I disconnect the battery. Found that out the hard way.

Never disconnected my battery and tried to run the DF but did jump start my long gone 2010 DF and it ran with a almost dead battery. Several of my other Chinese bikes have kick started and run with a almost dead battery. The DF should have a kick starter like all my other bikes including the Kawasaki W650.
The new 2015 Yamaha SR400 is kick start only. I wouldn't want that.

BTW, I always mod the battery box by cutting away some of the box around the terminal access areas to make it easier to work on and reduce the chance of grounding the positive lead.

**DanDaMan** · 10-05-2014, 02:12 AM

did u miss me ? Im back , a girl friends man left her in middle of night I had to go "rescue her" , here 2 months later , my sprockets still wobbling , size washer ID ?

**barnone** · 10-05-2014, 02:26 AM

Originally Posted by DanDaMan

did u miss me ? Im back , a girl friends man left her in middle of night I had to go "rescue her" , here 2 months later , my sprockets still wobbling , size washer ID ?

Dan,
I wondered what happened to you. How sure what "a girl friends man left her" means or what it has to do a wobbling sprocket but welcome back.

**DanDaMan** · 10-05-2014, 02:32 AM

my sprocket started wobbling , or I noticed it , the day she called balling , not fixed or rode since

votage regulator and turn signal relay from http://www.scooterparts4less.com/

Found replacement rear sprocket studs.

Honda Part number 90128-382-670 made in Japan.
Source - Ebay

bent your shift rod ? http://www.gravesport.com/Graves-Mot...Shift-Rod.html

horn bracket as well as a reflector bracket broke for seemingly no reason (rewelded reflector , replaced horn with 1 from Oreilies autoparts (car horn))

sprocket - http://www.oldbikebarn.com/Motorcycl...?search=JTR279 - 520 chain - most seem to go for 36 tooth 38 if your heavy or riding in really hilly conditions , myself (175 lbs) I use a 428 chain 17/36 (17 front wont fit with 520 chain) (15/30 16/33 520 equivalant) (80+ mph indicated perfect conditions) but you MUST HAVE jetting and air ram and keep valve adjustments very close and keep flapping clothing (drag) to a minimum or you will never see the top of 5th
- and remember max horsepower (between 10-15) is produced @ 2/3rds max RPM's unlike overhead cam motors and then it drops off SHARPLY , gear accordingly , you need not reach max rpm's in 5th if you can hold your desired cruise speed at 1/2-2/3 rpm's , which also increases fuel economy and manages heat better

air injector delete

dimming headlight problem, really easy to unplug the blue and white wire from the dark green wire and plug it into the other blue and white wire like it should have been been in the first place. now my light switch works and my lights don't dim

upjet http://www.mychinamoto.com/forums/sh...ll=1#post41593

magnetic drain plug - http://www.oldbikebarn.com/BikeMaste...AG-12MM-ALU-BM

LED tail light ( buy and install new socket/bulb )

I went to auto parts store and bought a radiator hose (used the air filter for sizing) with a 180 degree bend in it cut it to only have the U shape bolted it to the carb the other end to the air filter , now I have a forward facing air intake out in the air stream - aka poormans air ram ( no real effect untill past 50 indicated )

new battery (have to chop into steel battery box to get new 1 to fit) from autozone

HAVE A HUGE PROBLEM!!!!!!
Filled up the tank and started. Holy s--t full RPM, couldn't get to the kill switch fast enough.
pulled the needle seat didnt ya :P
wide open throttle is caused by re-inserting the carb tube (with needle in it) so dont seat fully . I did that myself
look at it the cutout has to be facing the rear wheel , and it will let it seat deeper , stopping that WOT on start

valve adjust - https://docs.google.com/viewer?a=v&p...wZDM3&hl=en_US = compression stroke = both valves fully raised

chain roller - http://www.ebay.com/itm/ATV-CHAIN-RO...009836&vxp=mtr

55/65 watt sealed beam headlight that fits - its a , Sylvania H5006 , and the Wiring harness to go with it , fit inside the existing headlamp shell

all right I believe thats everything fairly relivant to the DF's for the most part (just thought I would mash all upgrade repairs together into 1 compact area) - most are from what others have found im just jamming em into 1 post

from my saved page

**axa** · 10-05-2014, 06:56 AM

I was filled with guilt and thought dan got warped in to the 5th dimension along with gardo, cuz I asked him to film that video doing 80.
phew... though I'm still waiting for that vid...

**barnone** · 10-05-2014, 10:15 AM

Dan,
Good post on updates and maintenance for the DFs.
I used this magnetic drain plug at http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
on my latest Chinese bike.