Results 4,091 to 4,100 of 6336
|
-
#4091 Re: Dong Fang DF 250 RTB Bobber Information07-31-2013, 05:50 PM
Problem is that the horn is incorporated into the bracket , and cannot be removed, I have looked over it like 50 times and even took the last one apart and it basically is worthless now. I guess the best thing to do is just get a new horn set. and maybe mount in onto a better bracket before I stick it on the bike.
-
#4092 Re: Dong Fang DF 250 RTB Bobber Information07-31-2013, 05:50 PM
So what is being stated here is that a ratio lower than 2 and a third is required if ever hoping to do over 60 indicated...
becuase with 2.3333 as just about all of us have a standard front and 35 tooth back, no one (that im aware) is able to hold anything over 60mph indicated due to the rpm limitation.
dan, can you HOLD say at least 50 indicated on even the slightest incline?
if you can im going to suggest that something is seriously differnt about ur set up...
cuz i wont argue that down hill or even on a flat, your lower ratio will allow better speed at the 6k we can all achieve, but that decreased ratio wont help on an incline cuz the the power is what it is.
So if you can hold 50 or better on any incline its just got to be something else, maybe the forced air...
Anyway, think you can get your hands on a GPS and get a certain speed reading?
Even down hill I still seem to be capped around 6 or 6.5k, I had no understanding that the engine output would be limited in this way.
Of course there would be a ceiling but i had no idea it was so close to normal operating rpm.
Otherwise i would have went with a lower ratio myself
hopefully either forced air or jets will help increase power and there by increasing rpms
-
#4093 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Aug 2011
- Location
- texas
- Posts
- 266
07-31-2013, 06:08 PMI HOLD 70 in 5th up a slight incline into the wind , but to much an incline or to much wind ill have to downshift to 4th and scream along at max rpms at 68 or so
pushrod motors are famous for producing the most power at valve float terminus , pay attention to max torq rating and set your optimul cruising speed for that rpm , then there still something left and retaines enough umph to run your cruising speed
90-95% of my 6000 miles are all highway miles in texas on 65-70 mph roadways , and its rare I feel im to slow
my wife tailgunned me in her mustang , running into the wind up a slight grade , I couldn't get bike over 70 indicated , but she told me I was going 63 according to her speedo
bowtie - local auto parts store , the doit yourself section , $8 horn - fixed it after stock bracket broke , never a problem since
-
#4094 Re: Dong Fang DF 250 RTB Bobber Information
-
#4095 Re: Dong Fang DF 250 RTB Bobber Information
- Join Date
- Aug 2011
- Location
- texas
- Posts
- 266
07-31-2013, 06:46 PMvotage 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
-
#4096 Re: Dong Fang DF 250 RTB Bobber Information
-
#4097 Re: Dong Fang DF 250 RTB Bobber Information07-31-2013, 08:02 PM
Dan,
Your hp and torque numbers sound about right .
I was thinking the same thing about the gearing earlier today and ordered a 30 rear sprocket to try in place of my current 35 tooth one. I can pull my steep gravel driveway in second gear with the 35 so I should have plenty of first gear still and will just have to downshift more often here in the mountains.
Seems like I could run 68 MPH GPS on my 2010 with a 35 tooth but I could be dreaming.Vince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
-
#4098 Re: Dong Fang DF 250 RTB Bobber Information07-31-2013, 08:12 PM
Take a flashlight and get down on your knees and look up the muffler. The catalytic converter is in the front of the muffler. Yes, you are removing the catalytic guts. I used a one inch bimetal hole saw with a 12 inch extension and did a slow cut. I was lucky this time and all the guts blew out when I started her up. When I did it on my long gone 2010 I has to take the muffler off and run a snake from the front of the pipe to get all the pieces out.
Warning:The exhaust note is going to be a lot louder. Nothing like a Harley loud but...
Doing this gets rid of that real hot spot in the front of the muffler. That cat puts out some heat.Vince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
-
#4099 Re: Dong Fang DF 250 RTB Bobber Information07-31-2013, 08:20 PM
Dan,
I bought a 1157 led and replaced my taillight and didn't have to change the socket. Got rid of the dimming when I put on the brakes on my 2012. I didn't feel the need to fool with any of the wiring.
Thanks for bringing up the common issues post.Vince
2021 Ural cT
2022 Dong Fang DF250RTG
2021 Ice Bear 150cc scooter
2020 Ice Bear 150cc Scooter
-
#4100 Re: Dong Fang DF 250 RTB Bobber Information08-01-2013, 02:32 AM
Hey guys. I got my air injection off today and capped the port. Bike sounds a lot better. When adjusting the valves, how can I tell when the engine is in the compression stroke? In the past ive just put my finger over the spark plug hole or listened for the air sound. is there a visual way or easier way to do this on this motor? I know both valves should be closed for the compression stroke.
Most say that these bikes run lean. I still think my bike is running rich and not lean. It seems to run better when the motor is cold.. and as it warms up I lose performance. My plug has some black around the base. barnone said he thought my plug looked lean.. but I dont see any white on it, just black.Last edited by Bobthebobber; 08-01-2013 at 02:55 AM.
2012 DF RTB_A
Satin black, 35 tooth rear
« Previous Thread | Next Thread » |
Similar Threads
-
Help ID this customized chinese bobber please?
By fonzerelli in forum StreetReplies: 6Last Post: 01-16-2022, 01:39 AM -
DD350E-2 Bobber
By xacarrere in forum Manufacturers and ImportersReplies: 2Last Post: 08-28-2015, 12:03 PM -
Bobber Bikes
By Geronimo in forum SidecarsReplies: 12Last Post: 07-20-2011, 05:02 AM -
my 2nd 16 inch bobber
By Geronimo in forum SidecarsReplies: 3Last Post: 09-13-2010, 11:10 AM -
JH600B Information Wanted
By blazeafar in forum Welcome to MCM!Replies: 1Last Post: 04-29-2008, 12:38 PM
Tags for this Thread |