Dong Fang DF 250 RTB Bobber Information

**axa** · 08-17-2014, 03:14 PM

I just mounted one of the cylinder heads I have acquired, I found the mounting head cylinder bolt holes up to ¼ inch out of place... but I relocated the holes...
thing is I apparently didn't do it exact so when mounting needed to leave out the cylinder to head mounting bushings to get it to fit.
These are 3 metal inserts that slip over 3 of the head bolts and fit precisely on to each half of the cylinder and head making sure it's in the correct position and centered...

point is it should be know that if you blow up your engine you won't be able to find proper replacement parts for this loncin version of the 167fmm...
and unless you ate a machinist, you might well be shit out of luck.

trouble is that all these parts are all made differently and every one who sells them has no idea what they are selling,..
and in the end I could not find drop in replacement parts, so I recken you just might be better off replacing the entire engine

if I did it again I would never buy this bike or any with a clone Chinese engine.
it's a crap shoot....

**Woody87** · 08-17-2014, 05:22 PM

So I've cleaned out my pilot jet, and now I'm getting ready to re-install it. I took out the mixture screw, and have forgotten the order in which the washer/o-ring and spring should go in. Does someone know the correct install order for this?

Also, would someone be able to post photos of their clutch adjustment, as in a photo of the clutch cable (engine side) and the clutch lever/adjustment nut? This would help me greatly by giving me a reference point. Thanks!

**birdmove** · 08-17-2014, 06:19 PM

So, one may have to buy a new engine if yours needs any major engine work? That's a big drawback.

**barnone** · 08-17-2014, 07:36 PM

axa,
Did you use this for part numbers?
http://www.df-motor.com/MLC/Parts%20...TB-B(2014).pdf

909 939 3064
626 498 1298
dongfangmotorinc@gmail.com

CRT@nbchariot.com

**axa** · 08-17-2014, 08:34 PM

Originally Posted by barnone

axa,
Did you use this for part numbers?
http://www.df-motor.com/MLC/Parts%20...TB-B(2014).pdf

909 939 3064
626 498 1298
dongfangmotorinc@gmail.com

CRT@nbchariot.com

I called that number, about a dozen times, months ago. not only do they not pick up the phone but don't return message they receive.

furthermore as I mentioned, unless you go to a full service retailer, don't expect that Chinese part venders will even try to do any sort of cross referencing of part numbers. there are no resources for this.
they can't just pick up the doorman book and find all the manufacture numbers.
And the ones that will even try are 3 times the price, but still your not guaranteed a compatible part.

they will have only their internal part numbers, none will have blue prints or diagrams, they will send you measurements in imperial when you know the parts are I'm metric.
and then when you you have have asked all the relative questions, you realize you didn't ask about the cylinder outer sleeve diameter or the push rod through chamber positions.

besides... I've still not found a single vender for new rods...
how I got a set entirely lucky and unconventional..

on this thread I estimate up to 20 owners have come through,
2 dead engines.. neither which have been repaired. while not scientific, a10% failure ratio is a shitty reliability number.
I don't think its anything we didnt already know, but when you buy a Chinese bike and it working for you, then you tend to forget the reputation; until it doesn't work for you any more...

**axa** · 08-17-2014, 08:35 PM

Originally Posted by birdmove

So, one may have to buy a new engine if yours needs any major engine work? That's a big drawback.

that's what I've found...

**axa** · 08-18-2014, 03:56 AM

Introducing the worlds first 167FMM with a 10+ compression ratio...
slapped it together this weekend, it started right up!

i was actually rather anxious given all the crap it put me through.
did a few short bursts on the street, i like what its showing, but time will tell if it pulls any better...

IMG_20140817_232406141 (Large).jpg

the paint job looks sharp with the shaved fins.
vht flame proof satin coat over rustoleum high temp semi gloss black.
took the rest of the paint and did the carb and exhaust...

**birdmove** · 08-18-2014, 03:59 AM

Looking good!

**barnone** · 08-18-2014, 11:13 AM

axa,
That engine looks great.
So where did you get the parts?

As an aside, I got one of the "racing CDI" installed and it appears to have raised the top rpm by 800 or more. The engine sounds better with it installed. Higher top speed like my old 2010 DF.
http://www.ebay.com/itm/250908061794...%3AMEBIDX%3AIT
I'll have to ride a good bit to the four lane to get a good test. No level straight roads around here which is one reason why I am here in the mountains.

**axa** · 08-18-2014, 03:31 PM

Originally Posted by barnone

axa,
That engine looks great.
So where did you get the parts?

As an aside, I got one of the "racing CDI" installed and it appears to have raised the top rpm by 800 or more. The engine sounds better with it installed. Higher top speed like my old 2010 DF.
http://www.ebay.com/itm/250908061794...%3AMEBIDX%3AIT
I'll have to ride a good bit to the four lane to get a good test. No level straight roads around here which is one reason why I am here in the mountains.

thanks, i have various parts, from dealers online, and ebay, ultimately they might have came from the same company... hard to know.
but all of the heads were wrong.
im sure someone sells the proper head but i haven't found it...

So does this advanced/delay timing at all? adjustable??
This is extremely interesting indeed.
ive always been under the assertion that a spark is a spark and an explosion is an explosion...

there always is the very possibility that cheap/thin wire in the oem ignition...
now the timing... that for sure is a variable...

so what is your top rpm now?