Dong Fang DF 250 RTB Bobber Information

[birdmove]

You may find that the parts are very reasonably priced to fix your engine. If you can get the cylinder off without dropping shrapnel into the bottom end.

[Bobthebobber]

vtwin

http://www.ebay.com/itm/LIFAN-250CC-...c55798&vxp=mtr

[Bobthebobber]

bike300.jpgbike3002.jpg

She hit 300 miles today. Time for an oil change.

[DanDaMan]

ive been thinking about "cheating" and putting a 200cc 2 stroke in it :p , get these things doing 110 :O

u know keep the 4 stroke for inspection time , then swap to 2 stroke for a year , rinse and repeat

Ive just found a 2 stroke 250 online for 450 bucks , that many horsepower may buckle the frame ? although my little dong I love sitting on so much seems pretty sturdy .....

[axa]

ive been thinking about "cheating" and putting a 200cc 2 stroke in it :p , get these things doing 110 :O

u know keep the 4 stroke for inspection time , then swap to 2 stroke for a year , rinse and repeat

Ive just found a 2 stroke 250 online for 450 bucks , that many horsepower may buckle the frame ? although my little dong I love sitting on so much seems pretty sturdy .....

how do they inspect bikes in tx?
i mean, cant you find a garage that will just say whatever... this thing's a toy.
thats basically how they inspected my bike...

[bowtiewagon]

Well guys, the cush bushings arrived as well as the new wheel studs. here is a pick of the correct part number and the new bushings in place.


They came out easy peasy and went in just the same. Haven't remounted the wheel just yet. I started to clean it when I got the bushings in, and the grime and slime came off pretty easy with a can of wd40. wheel actually looks almost new again, then I started to look at the rest of the bike, and figured since I have the wheel off, I could repair the saddle bags, so I took them off, had to go buy a new needle and some leather repair thread,( seam splitting at the bottom of one bag) , gonna do that tonight, and then start from the back forward and clean and tighten the whole bike up. Figured it would be a good 10,000 mile makeover.

[ProDigit]

Does anyone have a tach on them, and can tell me on average how many RPMs the engine does at what speed? (and what their sprocket setup is)

EG: they have a 13/38T setup, and get 5k RPM @ 50MPH, or 4K RPM @ 60MPH, or something?

[axa]

Does anyone have a tach on them, and can tell me on average how many RPMs the engine does at what speed? (and what their sprocket setup is)

EG: they have a 13/38T setup, and get 5k RPM @ 50MPH, or 4K RPM @ 60MPH, or something?

afaik, only barone and i have tachs.

regardless of gear ratios its pretty well observed that max rpm with unrestricted air flow, no filter no cat, is about 7.5k
I have a reverse air ram and am able to top just about 7k if going down any sort of decline.

if you know your rpm, gear ratio, wheel size, you will be able to calculate possible speeds. But lack of power will keep some gear ratios from easily attaining those top speeds/rpm (unless as i say you are headed down a hill or something) then the ceiling is when your valves float, again unlikely more than 7.5k

knowing what you do at a certain speed will let you closely and calculate your speed with differnt gear ratio.

[barnone]

I have a new filter that allows me to reach 7k RPM without the sputtering and cutting out. $(KGrHqV,!gsE9wz0FB24BPj3M3q9UQ~~60_12.JPG

http://www.ebay.com/itm/181180637913...84.m1439.l2649

[ben2go]

I wonder if a larger 28mm to 30mm would gain any increase in power on top end?