THE BIGWHEEL THREAD!!! Yamaha BW350, BW200

Discussion in 'Thumpers' started by Mr. BigWheel, Feb 4, 2011.

  1. Shercoman

    Shercoman Been here awhile

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    Is the
    Yamaha Warrior engine the same or close to the BW engine?
  2. Mr. BigWheel

    Mr. BigWheel b00b

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    The Warrior uses the same cylinder and top end. The bottom end is completely different and I don't think the Big Bear engine would be a reasonable substitute for the BW engine because the bottom end and intersects the cylinder at a completely different angle.

    The CDI for the Big Bear 350 seems like it should have a similar ignition curve and advance. However, none of the connectors are plug-and-play.

    This is the BW350 cdi:

    [​IMG]

    and a closer view of the connectors:

    [​IMG]

    Here's the Big Bear's CDI:

    [​IMG]

    and some of the Big Bear connectors:

    [​IMG]

    They are clearly not compatible. However, someone clever with redneck electronics might be able to splice together a cure for the Cdi Malady.

    Any takers?

    Regards,

    Mr. BigWheel
  3. RebelYell

    RebelYell Been here awhile

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    is there anyway to per say have a bunch made for a group buy in here?so instead of costing us x amount from buying yamaha we could be saved some jing on it?Just a thought..
  4. jaubuchon

    jaubuchon Cheapest Boy Alive

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    Y'know what i think im gonna try to do this with a chinese cdi to see if it works so I don't destroy an expensive cdi If i screw up
  5. Mr. BigWheel

    Mr. BigWheel b00b

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    A few months ago truckinwagen had a 200 running on a Chinese cdi. His motor was on it's last legs and gave out as the experiment was in progress. It is definitely a possibility, but trying to find one with an ignition curve that will not cause detonation or preignition will be the challenge. There is even the possibility that the cdi contributed to the demise of truckinwagen's engine.

    The 200 owners are starting to get desperate as they scramble to get one of the remaining working cdi's. Right now a timely solution would be awesome.

    Are you up to the challenge, jaubuchon? The BW world awaits.

    Regards,

    Mr. BigWheel
  6. Travrsx

    Travrsx Adventurer

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    I wonder if a TW200 Cdi would work on a bw200?
  7. sticker

    sticker Adventurer

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    Hey everyone! Found this site after googling BW200 forums. I've had my BW200E for just over a year and love it. Been riding it alot this past summer and fall. It's in really good shape for 1986. I've spent all afternoon reading 49 pages of great info but was surprised to not read anything about aftermarket slipon pipes for the BW. I've been searching the web and EBay and found that an FMF Powercore4 will work on the BW200. I emailed FMF and they replied by saying that their pipe is the same as the pipe that fits a TW200. Although they have never fitted one on a BW. The FMF part number is 044312. A couple online MX stores have also stated that the pipe fits a BW. I'm so tempted to order a slipon from my local MX store but wanted to hear from some other members. Thanks!
  8. Shercoman

    Shercoman Been here awhile

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    Welcome Sticker!!!
  9. RWBWheel

    RWBWheel Been here awhile

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    Can anyone come up with an electrical schematic of the C.D.I. for 200's and the 350's??
    has anyone opened one up ?
    I just realised there is one on my parts bike but i need to see if it's good before doing an autopsy on it..
    I have an Uncle who is quite the circutry genius and might be able to talk him into at least consulting on a kit or a full replacement with hopefully upgraded / more current (I.E.dependable) components ...if i can get a schematic to send him..
    heck..if it was made once it CAN be replicated...and better ??
  10. RalphyDo

    RalphyDo Banned

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  11. Mr. BigWheel

    Mr. BigWheel b00b

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    Sticker,

    Welcome aboard. The FMF pipe DOES NOT fit the BW200 without some modification. It is a bolt-on proposition for the TW but requires the fabrication of a mounting bracket to fit to the BW. It would be worth the effort if you can pull it off though.

    RWBWheel,

    I have attempted to take a CDI apart and have determined the same thing that a bunch of others have:

    a) It's a lot of work because the circuitry is encapsulated in either a potting compound or reeeeeeaaaallllly tough silicone (mine was silicone)

    b) The circuit board will most likely get trashed getting the silicone or compound off. It may be difficult to determine what vacuum tubes and transistors were used if they are damaged during removal of the goo.

    c) The potting compound or silicone will most likely have to be dissolved in a highly toxic, carcinogenic chemical solution to preserve the integrity of the circuit boards

    d) You should limit your beer intake when trying to slice silicone off of circuitry with a razor blade (I don't know if anyone else actually determined this one. I may be on the "cutting edge" on this one. Ha!

    There was a member on the BW Yahoo Groups who was working on the issue.

    <a href="http://groups.yahoo.com/group/YAMAHABIGWHEELS/join">
    <img src="http://us.i1.yimg.com/us.yimg.com/i/yg/img/i/us/ui/join.gif"
    style="border: 0px;"
    alt="Click to join YAMAHABIGWHEELS"/>
    <p>Click to join YAMAHABIGWHEELS</p>
    </a>
    He was posting some encouraging x-ray images of the internals of the CDIs, but we haven't heard much lately.

    It can't be impossible to find a CDI replacement. It's just going to take more beer than we have thrown at the project so far.

    Regards,

    Mr. BigWheel
  12. dentvet

    dentvet Long timer

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    Yamaha CDI info including a DIY tutorial but not sure it applies to the BW line. Tomas Schattat is mentioned and is an inmate here (schattat) maybe somebody could reach out to him and have some cdi built. The TW200 crowd is in the same leaky CDI boat so maybe there will be economy of scale. I know schattat builds and sells ICOs

    http://www.transmic.net/en/89c2051.htm
  13. Mr. BigWheel

    Mr. BigWheel b00b

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    This is a listing of the models of bikes that use the same CDI as the venerated xt350. I think that the XT350 would be a likely donor model for a replacement BW350 cdi. Please enjoy the listing:


    MODELS:
    DT100K - 1983
    DT50L - 1988
    DT50LC - 1988
    DT50LC - 1989
    DT50LC - 1990
    DT50U - 1988
    DT50W - 1989
    DT80J - 1982
    ENDURO - DT50A - 1990
    RX50K - 1983
    RX50L - 1984
    RZ350L - 1984
    RZ350N - 1985
    RZ350NC - 1985
    RZ350NCII - 1985
    XT250K - 1983
    XT250KC - 1983
    XT250L - 1984
    XT250LC - 1984
    XT350 - XT350M - 2000
    XT350 - XT350MC - 2000
    XT350A - 1990
    XT350AC (CA ED.) - 1990
    XT350B - 1991
    XT350BC - 1991
    XT350D - 1992
    XT350DC (CA ED.) - 1992
    XT350E - 1993
    XT350EC (CA ED.) - 1993
    XT350F - 1994
    XT350FC (CA ED.) - 1994
    XT350G - 1995
    XT350GC (CA ED.) - 1995
    XT350H - 1996
    XT350HC (CA ED.) - 1996
    XT350J - 1997
    XT350JC - 1997
    XT350K - 1998
    XT350KC - 1998
    XT350L - 1999
    XT350LC - 1999
    XT350N - 1985
    XT350NC (CA ED.) - 1985
    XT350S - 1986
    XT350SC (CA ED.) - 1986
    XT350T - 1987
    XT350TC (CA ED.) - 1987
    XT350U - 1988
    XT350UC (CA ED.) - 1988
    XT350W - 1989
    XT350WC (CA ED.) - 1989
    YSR50A - 1990
    YSR50B - 1991
    YSR50D - 1992
    YSR50T - 1987
    YSR50U - 1988
    YSR50W - 1989

    UNIT ASSEMBLY CONTROL

    YAMAHA # 4Y3-85590-M0

    Remarkably, there is the four stroke 350 xt, a 250 four stroke, an 80cc two stroke, a 50cc two stroke pit bike and one of the world's most awesome bikes ever: the Kenny Roberts RZ350 two stroke, twin cylinder street bike, which uses the engine from the Banshee.

    Does that seem like a possible cdi for just about any bike out there?

    Should we try wiring one up or should I just contact schattat and avoid the entire piston-melting scenario?

    Regards,

    Mr. BigWheel
  14. dentvet

    dentvet Long timer

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    Yes thats a crazy application list for sure.

    I now realize that the schattat on adv is Tony, i think thomas is his dad. Anyway they are both yamaha nuts in the rally arena and tony can probably be of help, he's the one building the rally computers....

    There is also Ignitech in Europe for aftermarket CDI

    http://www.ignitech.cz/english/poptavka.htm
  15. Mr. BigWheel

    Mr. BigWheel b00b

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    Good thing the dollar is doing so well against the Euro.

    Aww, crap!
  16. frog13

    frog13 Long timer

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    What are the similiarities between a TW200 and BW200...if any?.I have a TW200(really like it).Just a curious question.
  17. RebelYell

    RebelYell Been here awhile

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    The engine thats about it on the bw 200 n tw200.I love the bw 200 it seems to go forever on a tankful of fuel.I rode it around all afternoon several months ago.I wasnt always easy on the throttle either,I must of rode it like 50 miles that day.I didnt even burn a half of tank of fuel:deal:lol3Too bad they didnt make these street legal.
  18. sticker

    sticker Adventurer

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    Mr. BigWheel, Thanks for the info regarding the FMF pipe. I'm pretty good at fabricating aluminum but I'm still debating on whether to buy a slipon or not. I searched YouTube for BW videos and their is a video of a BW with an FMF pipe on it. Can't remember which one but I'll try to find and post it here. It just shows the pipe on the bike but no pointers on install.
  19. frog13

    frog13 Long timer

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    Rebelyell....thank you.
  20. DEAVER

    DEAVER Been here awhile

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    someone told me the 350's are a pig on gas, is that true?