Dong Fang DF 250 RTB Bobber Information

**Cmanleylancaster** · 08-15-2014, 03:52 PM

So multiple alibaba.com companies have offered me my bike for $380. Now I'm really thinking of going to China to buy a few in person, come back and sell the extras on ebay or craigslist. What do you guys think?

**4950cycle** · 08-15-2014, 04:51 PM

OK
no problem then. Must be getting crappy batt after crappy batt then. .

**4950cycle** · 08-15-2014, 05:12 PM

$380 ! No wonder these bikes need "EVERYTHING" modified or improved. My main pet peeve is them sending them over here with the goofy tractor gearing that you have to immediately change (=$) as soon as you get the bike. And I like 520 chain, not minibike sprockets and chain on my bike. So it wasn't easy for me.

**Cmanleylancaster** · 08-15-2014, 05:27 PM

Originally Posted by 4950cycle

$380 ! No wonder these bikes need "EVERYTHING" modified or improved. My main pet peeve is them sending them over here with the goofy tractor gearing that you have to immediately change (=$) as soon as you get the bike. And I like 520 chain, not minibike sprockets and chain on my bike. So it wasn't easy for me.

What all did you change? I'm sure I'll want to upgrade mine ASAP...
Already picked out LEDs and headlight and more...

**4950cycle** · 08-15-2014, 06:48 PM

I already typed the long list then this site logged me out so I lost it. Also had to type everything at least twice . Because this site won't take the info I'm typing for some reason. Ofcourse this time its working fine but I don't have all day to do it again.

**barnone** · 08-15-2014, 07:09 PM

Originally Posted by 4950cycle

OK
no problem then. Must be getting crappy batt after crappy batt then. .

Did you do any testing for a current draw? You could have a problem.

**4950cycle** · 08-15-2014, 07:43 PM

Yes I did. But I'm not quite sure I did it right. So I will have to do it with different tester. It showed no draw. But the mutimeter I was using was more the AC /home construction type meter. I'd feel more comfortable with one of those little yellow multimeters from Haborfrieght. Just keep forgetting my coupon to get a free one. lol

**axa** · 08-15-2014, 10:09 PM

even if hes sometimes a grumpy old man, barnone should get admin rights to this thread.
it'd be half the size.

now back to the RTB

new top end is baking in oven as we speak...
https://docs.google.com/file/d/0B-Mh...p=docslist_api

a nice cross hatch...
https://docs.google.com/file/d/0B-Mh...p=docslist_api

new heads parts can be found but they are barely the quality of the OEM loncin.
castings are super rough, they will need to be ported even if you don't want to port.
push rod openings in the head are undersized and needed to be bored larger.
they come with nearly no cylinder home and cross hatch.
and there is no one selling replacement rods... I hadn't found a single vender regardless of location...
and ugly gray paint to boot ...

it's a full week of work including paint...

I decked this head out a full point for a 10:1 compression ratio...
what can I say I'm a pioneer...
now let the problems begin.
but I've bought a couple extras just in case I blow this one up as well.

by the way , I've got the old cylinder in the lathe now, boring it one over.
I just wanted to try out my home made boring bar, but if I get time down the road I'll look to cut a custom 68mm piece.
quite the challenge I think.

**axa** · 08-15-2014, 10:18 PM

Originally Posted by 4950cycle

Yes I did. But I'm not quite sure I did it right. So I will have to do it with different tester. It showed no draw. But the mutimeter I was using was more the AC /home construction type meter. I'd feel more comfortable with one of those little yellow multimeters from Haborfrieght. Just keep forgetting my coupon to get a free one. lol

what's wrong with what ever that meter is u describe.
no joke that yellow HF is as bottom of the barrel as they come. mine sits broken on my desk.
I'd go with the red one first. that one still works for me.
and I'd try it in the store before I leave...