Dong Fang DF 250 RTB Bobber Information

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Originally Posted by axa

Ive been looking for more motor nearly as long as ive owned the bike... nothing feasible.
I'm likely just going to get the rebuild kit and head for $180 and call it a day...
ill get old waiting to hit the lottery on another LS650...

Out of curiosity i researched the price of a dozen 68mm over pistons, and boring .5 from the cylinder wall...

The place that bored out my LS650 does it for about 35$ and i needed to confirm the 3mm walls could go down to 2.5 without trouble...
But the custom pistons would run near 350 each in small quantities...

400$ + just not that feasible for a 7cc bump.

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The wall thickness on my GS engine is 1.95mm with 10.5:1 compression and turns 13,000 thanks to aftermarket valve springs.

So I finally got the DF out on its first street ride, and the damn speedometer isn't working. It's getting power, both to the LCD display and to the turn/headlight indicators, but the speedometer needle and odometer aren't working. Any ideas on the possible cause and fix? I checked the wiring from the male-female connector down to the front hub, which I assume is the mechanism for the speedo. Ran out of daylight though, and I'll give it a go in the morning.

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Originally Posted by ben2go

The wall thickness on my GS engine is 1.95mm with 10.5:1 compression and turns 13,000 thanks to aftermarket valve springs.

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Good to know... So if we can get about 8 people together who want to try a 68mm bore for about 350 bucks... I know who to call...:deal:

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Originally Posted by barnone

http://www.alibaba.com/product-detai...632055351.html

Displacement (ml):

270cc

Attachment 15314

16 HP?
Awaiting reply from supplier in China, probably not EPA so no go.

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This would be pretty cool. Its a nice looking engine... But one off shipping from China is often a deal breaker as well.
Let us know if they actually get back to u.

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Originally Posted by Woody87

So I finally got the DF out on its first street ride, and the damn speedometer isn't working. It's getting power, both to the LCD display and to the turn/headlight indicators, but the speedometer needle and odometer aren't working. Any ideas on the possible cause and fix? I checked the wiring from the male-female connector down to the front hub, which I assume is the mechanism for the speedo. Ran out of daylight though, and I'll give it a go in the morning.

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Did you check the speedo cable at both ends?

I haven't gotten too in-depth with troubleshooting yet, BUT, the cable appears to be an electrical-sensor type and not a mechanical speedo, as one end goes to a 3-wire connector.

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Originally Posted by Woody87

I haven't gotten too in-depth with troubleshooting yet, BUT, the cable appears to be an electrical-sensor type and not a mechanical speedo, as one end goes to a 3-wire connector.

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Something must have changed.I thought all of them had a cable run to a drive unit on the front wheel.

My 2012 DF's speedometer is a mechanical one with a drive cable. Forget what the one on my 2010 was but it might have digital with an electrical pickup on the front hub like the one Woody is describing.
It is hard to tell from the parts list at http://www.scooterdepot.us/parts_htm...arts_list.html

Found a possible cause. The speedo will work with the engine off, however, when the engine is running the needle won't budge one bit. Clutch adjustment, maybe? I used an electric drill with a flathead bit and was able to spin the hub-drive end up to about 20mph.

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Originally Posted by Woody87

Found a possible cause. The speedo will work with the engine off, however, when the engine is running the needle won't budge one bit. Clutch adjustment, maybe? I used an electric drill with a flathead bit and was able to spin the hub-drive end up to about 20mph.

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Key on, engine nor running, spinning with drill motor and it works. That is weird.
The speedometer did work when you took your driving test,right?
Don't see how the clutch adjustment would have anything to do with it. Coasting at speed on bike with clutch in and speedometer works?
Engine running no work says it has something to do with charging?