Dong Fang DF 250 RTB Bobber Information

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Originally Posted by bowtiewagon

excellent information Thank you.
I have a question on a bit of another topic. Does anyone know if the stock handle bars on this bike is 7/8 or 1 inch. I am looking to change mine but everytime I try to do a measurement I am unsure and do not want to get messed up. thanks.

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Our Df's have a a 7/8 30 wide 5 pullback 4.5 center and rise is minimial. Due to my 5-8 height I'm replacing with a black 29.5 width 10 pullback 4.5 center 4.25 rise. I trust the extra 5" of pullback will allow me to seat comfortably. Worried if the wire/ brake wires will allow.
Real hassel to find in black. Better optional sizes out there but no black. I hope to exchange bars next week. Will advise.

Break in done & didn't get run over. Changing oil today & soon as weather allows see how this Bubba handles higher speeds.

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Originally Posted by GUN ROD

Our Df's have a a 7/8 30 wide 5 pullback 4.5 center and rise is minimial. Due to my 5-8 height I'm replacing with a black 29.5 width 10 pullback 4.5 center 4.25 rise. I trust the extra 5" of pullback will allow me to seat comfortably. Worried if the wire/ brake wires will allow.
Real hassel to find in black. Better optional sizes out there but no black. I hope to exchange bars next week. Will advise.

Break in done & didn't get run over. Changing oil today & soon as weather allows see how this Bubba handles higher speeds.

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GUNROD,
Please post a photo of your 10" pull back bars and the source when you get them installed. Did you change the 45 tooth rear sprocket for a 35? Stock gearing is way too low.
http://www.oldbikebarn.com/Motorcycl...?search=JTR279

I am looking at the 4inch dog bone risers to attach to the existing risers and a 3 to 4 inch pull back on the handle bars.. will decide today.update soon.I was trying to stay black,but they ARE hard to find.

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Originally Posted by barnone

GUNROD,
Please post a photo of your 10" pull back bars and the source when you get them installed. Did you change the 45 tooth rear sprocket for a 35? Stock gearing is way too low.
http://www.oldbikebarn.com/Motorcycl...?search=JTR279

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Yes, I will send photo. Yes I received the new 33 sprocket (they were out of 35s)yesterday, but waiting for chain break tool.
You have experience in making handle bar changes, do think I have enough cable/line to push out the extra 5"?
I ordered two pussy back bags that will substitute full size saddle bags. Matching tool bag for front. New seat coming too.
New chain (520 X-ring 120) & handlebars expected early next week. Buying up my wish list fast before the wife comes out of the ether.

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Originally Posted by bowtiewagon

I am looking at the 4inch dog bone risers to attach to the existing risers and a 3 to 4 inch pull back on the handle bars.. will decide today.update soon.I was trying to stay black,but they ARE hard to find.

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Why not buy a bar with the rise already bent in? For 7/8 bars Bikemaster & Flanders offer the best selection. Due to Black availability, had to go with Flanders #650-03602. If you want 3-4" pull with more rise check out the classic Daytona style

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Originally Posted by GUN ROD

Yes, I will send photo. Yes I received the new 33 sprocket (they were out of 35s)yesterday, but waiting for chain break tool.
You have experience in making handle bar changes, do think I have enough cable/line to push out the extra 5"?
I ordered two pussy back bags that will substitute full size saddle bags. Matching tool bag for front. New seat coming too.
New chain (520 X-ring 120) & handlebars expected early next week. Buying up my wish list fast before the wife comes out of the ether.

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I think that you will have enough cable. My bars are only 5" or so, 32" wide and plenty of cable. I would like more pull back so am interested in how yours turn out.

Also am interested in a report on your X-ring chain. Source? I've got 2200 miles on my OE chain and it seems to not need adjustment as often as before.

You better hurry on your mods as winter is coming.:lol8:

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Originally Posted by barnone

I think that you will have enough cable. My bars are only 5" or so, 32" wide and plenty of cable. I would like more pull back so am interested in how yours turn out.

Also am interested in a report on your X-ring chain. Source? I've got 2200 miles on my OE chain and it seems to not need adjustment as often as before.

You better hurry on your mods as winter is coming.:lol8:

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Chain: Motorcycle Superstore. EK mfg SKU#68208
There does seem to be extra slack for the pull, just worried it won't work after all the trouble and expense.

You guys with your Chinese bobbers might find this post interesting, from Bike Exif...

http://www.bikeexif.com/wp-content/u...umph-tiger.jpg

Not sure how your feet work around those pipes, though.

cheers!

old bike barn is definitely out of 35 tooth sprockets and don't know when they will get more. every time i search for the model number jtr279.35, everybody's out of them, i look for suitable alternatives and every place wants to know your make and model of your bike but naturally aren't going to have dong fang listed. i guess i'll tell them to send me the 36 tooth if they have it. my local honda shop made me take the sprocket off and bring it in to see if they could match the bolt pattern, but they couldn't.

hooliganboy,
If you go to http://www.jtsprockets.com/61.0.html and plug in the JTR sprocket number such as JTR279.35 the site will tell you what bike it fits. Go show your Honda dealer how to do it.

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Originally Posted by GUN ROD

Chain: Motorcycle Superstore. EK mfg SKU#68208
There does seem to be extra slack for the pull, just worried it won't work after all the trouble and expense.

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You might have to do a little cable rerouting. Thanks for the info on the chain.

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Originally Posted by barnone

hooliganboy,
If you go to http://www.jtsprockets.com/61.0.html and plug in the JTR sprocket number such as JTR279.35 the site will tell you what bike it fits. Go show your Honda dealer how to do it.

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I hope the Honda dealer isn't that daft.I would have to go else where.I recently ordered a JT sprocket and I checked the website to confirm I was about to order the correct sprocket.It wasn't for a DF tho.

I for got to add.Check this site or call them www.kinneycycles.com .That's where I got my sprocket from.They were $6 less than everyone else,including shipping.

thanks guys, and rather than look anything up at honda, the guy just compared the bolt pattern to every sprocket they carried, then told me nah, we don't have nothing like that, you might want to try the internet, like i haven't been relentlessly searching online already. and old bike barn's next sizes are 33 or 38, i'm just not sure what to go with. i guess i'll figure it out, or just wait til someone has the 35 in stock.

hooligan,
The point was you or your Honda dealer could look up what Honda model the JTR279.35 fit and then he could look up the Honda part number and order it.

Anyway, there is a JTR279.35 on Ebay http://cgi.ebay.com/HONDA-CMX-250-RE...sories&vxp=mtr
Also other size JTR sprockets on Ebay.

Anyone know of a source for a shop manual?

I'm assuming that the rear wheel needs to be removed from frame to install new sprocket.?

No shop manual for the DF that I know of.
Rear wheel needs to be removed to replace the rear sprocket. Make sure you notice what side of the old sprocket is out so you put the new one on the same way.
Lot less cussing with http://www.harborfreight.com/10-inch...set-97406.html
Also http://www.harborfreight.com/catalog...?q=Chain+break to shorten the chain.

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Originally Posted by barnone

hooligan,
The point was you or your Honda dealer could look up what Honda model the JTR279.35 fit and then he could look up the Honda part number and order it.

Anyway, there is a JTR279.35 on Ebay http://cgi.ebay.com/HONDA-CMX-250-RE...sories&vxp=mtr
Also other size JTR sprockets on Ebay.

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barnone,
thanks for link to ebay, i ordered it a little while ago.

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Originally Posted by barnone

No shop manual for the DF that I know of.
Rear wheel needs to be removed to replace the rear sprocket. Make sure you notice what side of the old sprocket is out so you put the new one on the same way.
Lot less cussing with http://www.harborfreight.com/10-inch...set-97406.html
Also http://www.harborfreight.com/catalog...?q=Chain+break to shorten the chain.

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I have both of those and they work beautifully.Just used them last week.

barnone, how many RPM's do you lose with the 35 tooth sprocket? I haven't even studied this subject at all , except for what I have read posted here so , don't laugh your ass off at me when I ask you if we could used an even smaller sprocket to lower cruise RPM's further and how would it affect the low end torque? Could we possibly get a larger sprocket for the output shaft? I am just curious about the performance possibilities for the DF. Would any of these changes be enough to make the DF a triple digit bike? (I don't want to go that fast on a bike, I am just being curious...)

Thank you sir , also... I like your new avatar, WAY COOL !!

bobber250,
I didn't do any testing of the stock gearing verses the 35 tooth sprocket so don't have an answer for you. I am currently running a 38 tooth rear here in WNC but have run a 33 also. Although I have not run the 35, I think it might be the best size for all around performance.

I'm guessing that the DF and like powered bikes with the CG250 are topped out a true 65-70 MPH. You will need to do a more powerful engine transplant to get 100MPH.

Take all claims of top speed posted on the net with a grain of salt.

hmmm, i wonder how much modification to the frame it would take to drop in a 652cc suzuki engine. it's a single cylinder air cooled engine too. just a thought.

Motorcycle gear/rpm/speed calculator

This will help show the impossible...

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Originally Posted by hooliganboy

hmmm, i wonder how much modification to the frame it would take to drop in a 652cc suzuki engine. it's a single cylinder air cooled engine too. just a thought.

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On my ride today I saw a Suzuki Savage (650) but was on my W650 and also didn't have a tape measure.:lol8:
On the other hand, I don't know if I wanna go much faster than 70 MPH on a hard tail bobber.:wheelchair:

Thank you barnone and mailman... the link mailman posted is an eyeopener, I think 65-70 mph is plenty speed for me... for now... LOL. As I get comfortable with the DF, I will probably upgrade to a larger bike.

Now for a new topic.... Has anyone counted the number of cycles there are on the road today?.... I remember not more than a year ago, that to see a motorcycle once a week was normal. Yesterday , while doing the weeks shopping and bill paying, I counted almost 100 bikes in about 5 hours.

Thank you guys.

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Originally Posted by bobber250

Thank you barnone and mailman... the link mailman posted is an eyeopener, I think 65-70 mph is plenty speed for me... for now... LOL. As I get comfortable with the DF, I will probably upgrade to a larger bike.

Now for a new topic.... Has anyone counted the number of cycles there are on the road today?.... I remember not more than a year ago, that to see a motorcycle once a week was normal. Yesterday , while doing the weeks shopping and bill paying, I counted almost 100 bikes in about 5 hours.

Thank you guys.

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for sure, there are lots of motorcyclists out on the road these days. even when i take a short ride i find myself waving to at least 10 people. on longer rides (25 miles or more) it might upwards of about 40 people or more, but soon we'll be seeing less riders as it gets colder outside.

When I was in high school.Six seniors had bikes.A few hardcore HD bikers rode year round.That was in the early 90's.Today,I can't go anywhere without passing 15 to 20.the only time you don't see a bike around here is when we get winter weather.Our snow is more like shaved ice than snow.

Finally a window of weather today to ride after the breakin & new oil. My dealer had 10w30 in for breakin, now that I put in the 10w40 wet clutch oil, it shifts smooth. Neutral available still only on down shift from 2nd. 'Bubba' was strong & fast up to 60, unable to keep going up due to speed limits. Will try again on a freeway soon.
Yes the gearing is original, I'm finally getting the parts in to modify. For guests reading, understand this is not a factory out of the crate view, i spent 20 hours before photo to remove stripes and paint most chrome items (light sand 600, clean acetone, light first coat, then nail what you want, Weber grill 1500 spray with Duplicolor ceramic engine paint, also 1500 degree paint. Note after delivery allot of ferris metal not protected take the time with light sanding & cleaning paint those areas. After getting into the real world you can't reverse the rust coming. Sounds like most of you need to wait for registration anyway. Get to know your bike. Its an important relationship.Attachment 5641

just got my 35 tooth sprocket in the mail today. i'm going to put it on in the morning, i can't wait to take a ride and see how much of a difference it makes. thanks again barnone for the link to ebay, it came pretty fast.

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Originally Posted by hooliganboy

just got my 35 tooth sprocket in the mail today. i'm going to put it on in the morning, i can't wait to take a ride and see how much of a difference it makes. thanks again barnone for the link to ebay, it came pretty fast.

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Your welcome, always glad to help out.

Make sure you put the new sprocket on with the same side out as the original one.

I am interested in your impression of the difference in performance. It been so long for me that I don't remember the difference. Documenting your speed before and after would be helpful for others.