Dong Fang DF 250 RTB Bobber Information

[chruk bashre]

or do you mean bare like this?

chpbobdone3.jpg

[chruk bashre]

[chruk bashre]

[chruk bashre]

just updated my Album. tricky clicky to get the before/after thing just right. free preview time

Before
1plug 007.jpg
After
chpbobdone2.jpg
Before
Chpboba-1.jpg
After
chpbobdone1.jpg

[chruk bashre]

i thought i stopped that last picture from going on, but, oh goodie, just found a Before for my favorite After. have to 'mod' my Album again. i try this up.

Before
chpboba-3.jpg
After
chpbobdone3.jpg

[axa]

or do you mean bare like this?

chpbobdone3.jpg

ya ya... like that and that....
this engine is just a bit... 'thinner' than im used to...
At least on the 2012 model there are the 2 welded tabs to hold the pump that ill have to cut at some point

[axa]

So capped off what was left of the secondary air intake system.
And then before starting the engine, i decided to adjust my valves...
Well, I just like just about everyone else whom has reported, I find my valves dead tight... that is NO clearance at all.
I found this a bit odd being from what i understand a bit of clearance is standard for a push-rod type engine.

And it wasn't even like, they were just in contact and as soon as i loosened the stem the gap began to give clearance... Not at all, it was like a bunch of little turns until finally stress was relived and the gap began to clear.
And this is with the motor cold of course...

So from what i understand, the point of that tiny bit of clearance is to allow expansion of the rods when the engine has heated up...

Well as soon as i started up, the clapping noise of the valves with clearance seemed quite evident.

anyway, i would recommend everyone take a look at their valves as it seems this is something the builders aren't concerned about...
Especially if you have a new bike. I don't really know what it means for older engines... perhaps they have given themselves room already... yikes

[Bob form NV]

chruk, I see you got the valve cover off. The recomended clearances I got from a reliable source are exaust .008 - intake .006. Works for me. Make sure you are in compression stroke or you will be way loose.

[axa]

chruk, I see you got the valve cover off. The recomended clearances I got from a reliable source are exaust .008 - intake .006. Works for me. Make sure you are in compression stroke or you will be way loose.

Reliable source?
The document from PIT motors recommends .004 & .002
http://www.mychinamoto.com/forums/sh...ll=1#post58046

isn't PIT the importer of the CCW Heist? Isn't the Heist using the same engine? Isn't that a more reliable source?
Do tell...

[chruk bashre]

VALVE LASH. man, somecrap. dongfangin thing. alot of searching. no real good info. i know this has been going on a while. what did barnone say when he was on?

the[PIT-MOTORS]page link from a few threads back says 0.002"~0.004=(0.051mm~0.102mm) we have a 167FMM as you know.

on my bing page alone i saw 0.05mm~0.06mm=0.002"~0.0025"(167FMM-M,heist),

a little down the page, 0.04mm~0.06mm=0.0015" ~0.0025" (167FMM(CG250)).

then a 167FMM-N led me nowhere.

and then if you go this page, you can see another set of specs. http://www.ebay.com.au/itm/CG250-250CC-167FMM-4-STROKE-AIR-COOLED-ENGINE-MOTOR-MOTORCYCLE-DIRT-BIKE-ATV-/360580057495 go here and a bit down the page past the commercials shows a chart of the

250cc shineray 167FMM(CG250) with specs showing 0.04mm~0.06mm. thats a tiny 0.0015"~0.0025" !!!