THE BIGWHEEL THREAD!!! Yamaha BW350, BW200

[Shercoman]

Is the
Yamaha Warrior engine the same or close to the BW engine?

[Mr. BigWheel]

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:



and a closer view of the connectors:



Here's the Big Bear's CDI:



and some of the Big Bear connectors:



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

[RebelYell]

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..

[jaubuchon]

Originally Posted by Mr. BigWheel

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:



and a closer view of the connectors:



Here's the Big Bear's CDI:



and some of the Big Bear connectors:



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

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

[Mr. BigWheel]

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

[Travrsx]

I wonder if a TW200 Cdi would work on a bw200?

[sticker]

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!

[Shercoman]

Welcome Sticker!!!

[RWBWheel]

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 ??

[RalphyDo]

Hey guys, Got NOS piston, rings and gaskets for an 86 bw200 if anyone is interested. See it here: http://advrider.com/forums/showpost....postcount=9955

[Mr. BigWheel]

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.


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alt="Click to join YAMAHABIGWHEELS"/>

Click to join YAMAHABIGWHEELS

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

[dentvet]

Originally Posted by Mr. BigWheel

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

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

[Mr. BigWheel]

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

[dentvet]

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

[Mr. BigWheel]

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

Aww, crap!