Adventure Motorcycle Magazine Subscribe Now

Page 577 of 634 FirstFirst ... 427527557567575576577578579587597627 ... LastLast
Results 5,761 to 5,770 of 6336
  1. #5761 Re: Starter motor brushes 
    Senior C-Moto Guru axa's Avatar
    Join Date
    Apr 2013
    Location
    Lower Hudson Valley Elevation: 240ft
    Posts
    580
    so do you have a hiest or a DF?

    Quote Originally Posted by heist222 View Post
    I need new sprockets( suggestions for good torque and speed? I am thinking 13/35).
    im about 160 and IMHO I would get (and have) the lowest ratio available (without replacing both sprockets and possibly grinding the front sprocket cover), 2.3. DF stock front 13, 30 rear which is the smallest available.
    The bike doesn't have much power , but it is certainly possible to get on a long strait or decline where even perhaps with both you and ur chick on the bike might be be held back by anything less.
    I bought a 35 because everyone and their mother said that was the best, put a few hundred miles on it, consistently riding at the 7-7500rpm redline, which if i recall is a modest 55 - 60 mph at that ratio (real not 10% overzealous stock DF speedometer) and then went to 30 and glad i did.

    At my weight with a full backpack, full face helmet and some leather, Im still constantly near the red line.

    The only argument i hear against a lower ratio is that it takes longer to get through (each/all) gear(s).
    And if your heavy its arguable that you will have less of top possible speed so a higher ratio will better distribute through the range, but i just dont put much stock in that argument.
    At top speeds the wind resistance is 50% of your engine output, an actual greater factor than say a 30% heaver load.
    A higher ratio just gets you to a lower speed faster, so it makes no sense to me.

    Now if your on the F1 circuit and it matters exactly where your shift points are then by all means limit your top speed with a higher ratio.

    Quote Originally Posted by heist222 View Post
    -I need new jets
    You don't state which jets and for what purpose.
    Pilots?
    if replacing a clogged one, you need a new 40, you could get away with 42 or perhaps 45.
    If you have reason to think you need a different size, here is everything you'll ever need
    http://www.ebay.com/itm/401030124735...%3AMEBIDX%3AIT

    you wont use most of them but look at the price, most people pay more for a single jet.
    These are shipped from one of the most famous counterfeiting locations in china, but i measured these with a pin gauge set and they were remarkably accurate, I cant speak for hole roundness but overall throughput are accurate. I don think it matters in our use.

    main?
    m5-.08 is what you want.
    105 is stock, if replacing a clog.
    http://www.ebay.com/itm/Carburetor-M...5WX~so&vxp=mtr

    again more than you need, and i cant vouch for this seller but you get the idea.


    Id be careful about re-jetting a nicely running engine if you have no fair reason to.
    Last edited by axa; 04-25-2016 at 07:20 PM.
    2012 DF250RTB_B with Yamaha XV250 V-twin
    1998 XVS650 (For Sale)
    2003 LS650 with Voodoo Vintage hardtail
    Reply With Quote  
     

  2. #5762 Re: Starter motor brushes 
    Senior C-Moto Guru barnone's Avatar
    Join Date
    Dec 2009
    Location
    SWFL WNC
    Posts
    2,154
    heist222,
    Sounds like you have a DF250RTB-B, right?

    Why does it need an overhaul?

    Why does it need new jets? The 2012 DFs seem to be jetted just fine. The 2010 DFs needed rejetting.

    As mentioned by axa, the DF is a low powered bike and there is not a lot of power to be gained by modifying the engine and probably a lot to lose in reliability. Remember it started out as a CG125 125cc and is now a 229cc. If you are not satisfied with a top speed of about 55 MPH (GPS) then it is the wrong bike for you.
    I have a tack on my DF and never run it over 5k RPM.

    The stock front sprocket is as large as possible without grinding on the engine case.
    I'm running a 35 tooth rear and have tried the 30 but it seemed too high for the riding I do in the mountains of Western North Carolina. Try one or the other to see what fits you style of riding. No big deal to change anyway. Choices are 30,32,33,35,38,etc
    http://www.amazon.com/s/ref=nb_sb_no...rockets+jtr279

    Riding two up is not something I would do on a DF without fitting a proper rear seat and passenger pegs. You also need some kind of chain guard on your bike. That chain could do some damage to your GF's foot. Very dangerous to ride two up on a stock DF.

    BTW, take all recommendations with a grain of salt. What works for me might work for you.
    Attached Images
    Vince
    2021 Ural cT
    2022 Dong Fang DF250RTG
    2021 Ice Bear 150cc scooter
    2020 Ice Bear 150cc Scooter
    Reply With Quote  
     

  3. #5763 Re: Starter motor brushes 
    C-Moto Guru bowtiewagon's Avatar
    Join Date
    Jul 2011
    Location
    Houston,Tx
    Posts
    371
    hey guys, sad news, my bike I think died today. Was in the process of pulling out of a driveway from work, put her into first, large dathunk ,stalled, hard to restart, got her going and no power at all, stalled again, and would not start ... had to trailer her home. Thinking by the sound something inside let go. Just got home.. haven't done anything yet.. but pretty sure she is done motor wise. 18,583 miles on her. Need some input on where to obtain a possible replacement motor, or steered into that direction. Figure not worth rebuiling out of not being able to aquire the parts. So if you have some ideas , shoot them this way. Hangin a broken heart tonite.
    Reply With Quote  
     

  4. #5764 Re: Starter motor brushes 
    C-Moto Not-so-Noob
    Join Date
    Jul 2013
    Location
    Nebraska
    Posts
    37
    That sucks, Man. Hope you can find a replacement. Would any of those 250cc motors on ebay work? I see they are OHC instead of pushrod. Kind of pricey with shipping....

    http://www.ebay.com/itm/250cc-Zongsh...mjB672T9ilKEMg
    2010 DF250RTB
    Reply With Quote  
     

  5. #5765 Re: Starter motor brushes 
    Senior C-Moto Guru barnone's Avatar
    Join Date
    Dec 2009
    Location
    SWFL WNC
    Posts
    2,154
    That does suck. Might be worth taking it apart to see what failed.

    Send this guy a request for a price on a CG250 engine. "We have Air Cooled CG250 in stock"
    http://www.chinese-parts-canada.com/new_motors.html
    His prices use to be reasonable. He had a location in the US to avoid customs problem.

    I sent off a request for a Lifan CG250 motor from China. Need to make sure it is EPA approved.
    Vince
    2021 Ural cT
    2022 Dong Fang DF250RTG
    2021 Ice Bear 150cc scooter
    2020 Ice Bear 150cc Scooter
    Reply With Quote  
     

  6. #5766 Re: Starter motor brushes 
    C-Moto Guru bowtiewagon's Avatar
    Join Date
    Jul 2011
    Location
    Houston,Tx
    Posts
    371
    yeah probably will open it up just to see, I would like to know for sure, and I will ask this guy.Thanks Bar.
    Reply With Quote  
     

  7. #5767 Re: Starter motor brushes 
    C-Moto Guru bowtiewagon's Avatar
    Join Date
    Jul 2011
    Location
    Houston,Tx
    Posts
    371
    just wonder if the motor in the 2012 DF250 RTC is the same motor. looking at this for a quick fix right now..
    http://www.ebay.com/itm/12-Dongfang-...xWXiJS&vxp=mtr
    Reply With Quote  
     

  8. #5768 Re: Starter motor brushes 
    C-Moto Not-so-Noob
    Join Date
    Jul 2013
    Location
    Nebraska
    Posts
    37
    Wow, free shipping.
    2010 DF250RTB
    Reply With Quote  
     

  9. #5769 Re: Starter motor brushes 
    Senior C-Moto Guru axa's Avatar
    Join Date
    Apr 2013
    Location
    Lower Hudson Valley Elevation: 240ft
    Posts
    580
    Quote Originally Posted by bowtiewagon View Post
    yeah probably will open it up just to see, I would like to know for sure, and I will ask this guy.Thanks Bar.
    woh woh, slow down guys! just jumping and looking into entire engines is a bit hasty. i know the feeling but relax.

    the fact that you got it going after you heard the noise, Occam's razor and my intimate knowledge about a 167fmm's combustion environment tells me that there is less of a chance that there is bad damage.
    my 2000 mile diagnosis says you have a blow head gasket.
    that can be noticed if trying to start it, and you see or feel gush of air somewhere between the head and cylinder body.

    been there done this, i carry a spare as standard procedure...
    6$ on ebay.

    of course its hard to diagnose over the internet so:
    pull off the head cover.
    pull off the head. 4 bolts.
    if im right you will see a torn up gasket.

    Now if there isn't any damage to the mating surface place in the new one.
    if it were me id resurface and use nothing, but you might want to dab a bit of rtv silicone around the same places it was used when you pull it off.
    put it back, i think 22 ft lb for the head bolts. 60 in pb for the head cover.
    you will likely need to adjust the valve clearance after removing the head.
    i use .04 in, .06 out.

    there... bikes running again for 6$

    if you had open it up and your head looks like this:
    https://drive.google.com/open?id=0B-...1NvM1ZPOThlOFU
    or if your piston looks like this:
    https://drive.google.com/open?id=0B-...nd1MlV2b0ZuTU0

    then that's a different story, but you would not have gotten its started again if it had...

    you can check for this sort of damage by taking out the spark plug and seeing if it looks like this:
    https://drive.google.com/open?id=0B-...3BNZDBCY0hKNUU

    if it does unfortunately the other damage is fairly likely.

    take pictures
    Last edited by axa; 04-26-2016 at 06:53 PM.
    Reply With Quote  
     

  10. #5770 Re: Starter motor brushes 
    Senior C-Moto Guru barnone's Avatar
    Join Date
    Dec 2009
    Location
    SWFL WNC
    Posts
    2,154
    Quote Originally Posted by bowtiewagon View Post
    just wonder if the motor in the 2012 DF250 RTC is the same motor. looking at this for a quick fix right now..
    http://www.ebay.com/itm/12-Dongfang-...xWXiJS&vxp=mtr
    Looks to be the same from here but I would take axa's advice and at least pull the head.
    EDIT
    I looked closer and it has 250 cm3 stamped on the cylinder even though it is stamped a 167fmm on the block.
    Our DF motor is a 167fmm and is 229 cm3.
    Last edited by barnone; 04-26-2016 at 08:14 PM.
    Vince
    2021 Ural cT
    2022 Dong Fang DF250RTG
    2021 Ice Bear 150cc scooter
    2020 Ice Bear 150cc Scooter
    Reply With Quote  
     

Similar Threads

  1. Help ID this customized chinese bobber please?
    By fonzerelli in forum Street
    Replies: 6
    Last Post: 01-16-2022, 01:39 AM
  2. DD350E-2 Bobber
    By xacarrere in forum Manufacturers and Importers
    Replies: 2
    Last Post: 08-28-2015, 12:03 PM
  3. Bobber Bikes
    By Geronimo in forum Sidecars
    Replies: 12
    Last Post: 07-20-2011, 05:02 AM
  4. my 2nd 16 inch bobber
    By Geronimo in forum Sidecars
    Replies: 3
    Last Post: 09-13-2010, 11:10 AM
  5. JH600B Information Wanted
    By blazeafar in forum Welcome to MCM!
    Replies: 1
    Last Post: 04-29-2008, 12:38 PM
Tags for this Thread

View Tag Cloud

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •