Dong Fang DF 250 RTB Bobber Information

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Originally Posted by drgnsghost

Looks like my battery just needed charging. Soon as I charged and reconnected the battery, she started right up. Although now the engine is revving extremely high. Turning the air/fuel mix screws didn't help, so I'll be doing more reading on how to adjust the valves like you guys said. Most of the posts I've read say it's pretty easy, just nervous cause I'm new to bikes and mechanics.
Thanks for the help!

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Make sure the slide valve is installed properly in the carburetor. Take the air cleaner off and see it the slide valve is closed. If it is wide open then that is the cause of the high RPM.
Page 6 of http://wem.walbro.com/distributors/s...CAEBURETOR.pdf

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Originally Posted by bowtiewagon

O.K> so next question is, can the crankcase housing/transmission cover come off without disrupting anything...like parts falling out.I have never taken anything that far apart on this bike, and do not want like a lump of parts on the floor just cause I took the cover off.

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what do you mean "housing/transmission" cover? the transmission's clutch cover, stator cover, crank bolt access cover?

Ive found at least on my bike without any leaks, only 1000 miles, and clean, I could remove the head cover, head, cylinder without any problem to reassemble. Meaning no parts fall out, and even the gaskets would likely be reusable as there use no adhesives...

At that point you get a bit more view of the starter reduction gear line

I will take pics tonight. Basically it is the left side cover on the motor,just in front of the drive gear the chain is attatched to,that is around the crank bolt.Which also houses the internal gears for the starter reduction gears.

:riding: Sorry to hijack and/or get off topic, but 501 pages! Who knew among the majority of all the expats living and working in China, and all the Europeans from various countries, seemingly mainly the UK, this thread about a bobber with a cult-following would be the longest thread with the most views :clap:...and not on Chinariders.net which is North American based, while this bike seems to only be available in the US!? Ok, back to normal...:gun_bandana:

culcune,
Yep, kinda funny. Why is the DF250RTB not sold in other countries? There is supposedly a DF125RTB which would not be made for the US market since we don't have the 125cc restriction like the UK. It is a pretty decent quality bike. My 2012 was only $2199 delivered to my cabin in WNC.
http://www.df-motor.com/product.asp

DF needs to build a DF400RTB which would really sell well in the USA. Keep it air cooled and simple and inexpensive.
Attachment 15413
It looks like this guy put a Iron Head Hog in a DF250RTB-B then a 400cc engine should not be too much of a problem.

It would be a great little ride with, say, the Lifan 250cc v-twin (which is a copy of the Yamaha V Star 250 engine). Now I started thinking about putting different engines into the DF frame. The engine from the Buell Blast comes to mind. A 500 single based on the Sportster engine. I rode a Blast, and the one I rode had no problem hitting 80mph stock (the statute of limitations has run out on that crime). Or, what about the nice 650 single from the Suzuki Savage/S40?

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Originally Posted by birdmove

It would be a great little ride with, say, the Lifan 250cc v-twin (which is a copy of the Yamaha V Star 250 engine). Now I started thinking about putting different engines into the DF frame. The engine from the Buell Blast comes to mind. A 500 single based on the Sportster engine. I rode a Blast, and the one I rode had no problem hitting 80mph stock (the statute of limitations has run out on that crime). Or, what about the nice 650 single from the Suzuki Savage/S40?

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Sounds nice in theory, but then you get the savage (or any other of these engines you mention) and try to fit in the DF frame, you realize its nearly as much work to fit the engine to the DF as it would be just to fit a hardtail to the savage...

Both DF front and rear engin mounts need to be moved/modified, The down tube also has to be moved and modded.

so that's exactly what i did... hardtailed the savage

Attachment 15415

on the savage
Attachment 15416

Now if at the time I had another bike to ride, and my DF engine had already blown, it just have done the swap... but still i doubt it.
Its a hard decision to take 2 perfectly working bike off the road today, to have 1 in the future.

Though if you just happen to have a motor sitting around from a otherwise dead bike, then perhaps you can do it over the winter and waste nothing...

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Originally Posted by axa

what do you mean "housing/transmission" cover? the transmission's clutch cover, stator cover, crank bolt access cover?

Ive found at least on my bike with leaks, only 1000 miles, and clean, I could remove the head cover, head, cylinder without any problem to reassemble. Meaning no parts fall out, and even the gaskets would likely be reusable as there use no adhesives...

At that point you get a bit more view of the starter reduction gear line

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Some motorcycles.the starter clutch drive gears can fall out when the charge rotor side cover is removed.I haven't been inside a DF motor so I can't say how the starter clutch is driven.

Woody87,
Still having that sputtering at 20 MPH in 1st gear?
I started getting it with my 2012 DF at about 4K RPM. Turns out I left out the spring clip that holds the needle down in the carb. Must have happened when I was removing the shims under the needle.

My next step was going to be replacing the entire carb with this Keihin (?) PZ30 pumper for $35.99 shipped.
http://www.ebay.com/itm/181230460483...84.m1497.l2649

This carb looks identical to the Sheng Way PZ30 I have on my TMEC 200 enduro. The Chinese are not very original with their carbs! :lol8: